U.S. patent application number 14/475986 was filed with the patent office on 2015-03-05 for x-ray scanning system and method.
The applicant listed for this patent is United Parcel Service of America, Inc.. Invention is credited to WENDIE PATRICIA HAYLER, ROY DOUGLAS HUDSON, MARCUS A. JONES, ANTHONY DAVID KIRK, PAUL MASON, MARK RUTHERFORD, JAMES TERMINI, GILBERT WALTER VANORDER, III.
Application Number | 20150063539 14/475986 |
Document ID | / |
Family ID | 51541363 |
Filed Date | 2015-03-05 |
United States Patent
Application |
20150063539 |
Kind Code |
A1 |
HAYLER; WENDIE PATRICIA ; et
al. |
March 5, 2015 |
X-RAY SCANNING SYSTEM AND METHOD
Abstract
Systems and methods for scanning an item utilizing an X-ray
scanner in order to facilitate a determination of whether the X-ray
radiation penetrated through the entirety of the scanned item.
Various embodiments comprise a conveying mechanism, an X-ray
emitter, a detector, and an X-ray penetration grid (XPG). The XPG
may comprise a radiopaque grid that may serve as a reference for
determining whether radiation passes through the scanned item, the
grid oriented such that the grid members are neither parallel nor
perpendicular to the direction of travel. Such orientation may
minimize or eliminate "ghosted" radiation signals included in a
visual display of the radiation received by the detector. A scanned
item may be oriented with the XPG such that radiation emitted by
the X-ray emitter that passes through a portion of the scanned item
must also pass through the XPG before being received by the
detector.
Inventors: |
HAYLER; WENDIE PATRICIA;
(ATLANTA, GA) ; RUTHERFORD; MARK; (DONCASTER,
GB) ; JONES; MARCUS A.; (ROSWELL, GA) ; KIRK;
ANTHONY DAVID; (MARIETTA, GA) ; VANORDER, III;
GILBERT WALTER; (CUMMING, GA) ; HUDSON; ROY
DOUGLAS; (STOKE-ON-TRENT, GB) ; MASON; PAUL;
(BILLINGHAM, GB) ; TERMINI; JAMES; (DONCASTER,
GB) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
United Parcel Service of America, Inc. |
Atlanta |
GA |
US |
|
|
Family ID: |
51541363 |
Appl. No.: |
14/475986 |
Filed: |
September 3, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61873541 |
Sep 4, 2013 |
|
|
|
Current U.S.
Class: |
378/57 ;
378/145 |
Current CPC
Class: |
G21K 1/10 20130101; H04L
9/3234 20130101; H04L 9/30 20130101; G06F 2009/45587 20130101; G06F
9/45558 20130101; G01N 23/10 20130101; G01N 2223/643 20130101; G01N
2223/30 20130101; G06F 2009/45595 20130101; G01N 2223/3307
20130101; G06F 8/63 20130101; G01N 23/04 20130101; H04L 9/0897
20130101; G01V 5/0016 20130101 |
Class at
Publication: |
378/57 ;
378/145 |
International
Class: |
G01V 5/00 20060101
G01V005/00; G21K 1/10 20060101 G21K001/10 |
Claims
1. An X-ray detector system for determining the contents of an
item, the system comprising: an X-ray emitter configured for
emitting X-ray radiation; a detector comprising a receiving
surface, the detector configured to receive the X-ray radiation and
to generate one or more intensity signals indicative of an
intensity of the received X-ray radiation at each of a plurality of
locations on the receiving surface; an X-ray penetration grid
comprising a first grid structure comprising: a perimeter
surrounding the X-ray penetration grid having at least a first
side, said first side being oriented in a first primary direction;
a first plurality of parallel grid members each having a first end
and a second end; and a second plurality of parallel grid members
each having a first end and a second end; wherein: the first
plurality of parallel grid members are coincident with a first
plane; the second plurality of parallel grid members are coincident
with a second plane; the first plane and the second plane are
parallel; the first end and the second end of each of the first
plurality of parallel grid members intersects the perimeter at an
angle such that the first plurality of parallel grid members are
neither parallel nor perpendicular to the first side of the
perimeter; and the first end and the second end of each of the
second plurality of parallel grid members intersects the perimeter
at an angle such that the second plurality of parallel grid members
are neither parallel nor perpendicular to the first side of the
perimeter; and a conveying mechanism configured for conveying the
item and the X-ray penetration grid in a second primary direction
to a location between the X-ray emitter and the detector, said
second primary direction being substantially the same as the first
primary of direction.
2. The X-ray detector system of claim 1, further comprising a user
system comprising one or more memory and one or more processors,
the user system configured to: receive, via the one or more
processors, the one or more intensity signals; and cause, via a
display device, display of the intensity signals.
3. The X-ray detector system of claim 2, wherein the displayed
intensity signals further comprise: signals indicative of a current
location of the item; and ghost signals indicative of ghosted
images extending at least substantially parallel to said second
primary direction.
4. The X-ray detector system of claim 3, further configured to
generate, via the one or more processors, one or more notifications
indicating the presence of ghost signals.
5. The X-ray detector system of claim 1, wherein the first plane is
spaced a distance apart from the second plane.
6. The X-ray detector system of claim 5, wherein each of the first
plurality of parallel grid members is continuous and each of the
second plurality of parallel grid members is continuous.
7. The X-ray detector system of claim 1, wherein the angle at which
the first end of each of the first plurality of parallel grid
members intersects the perimeter is between 30 degrees and 55
degrees.
8. The X-ray detector system of claim 7, wherein the angle at which
the first end of each of the first plurality of parallel grid
members intersects the perimeter is 45 degrees.
9. The X-ray detector system of claim 8, wherein the first
plurality of parallel grid members are perpendicular to the second
plurality of parallel grid members.
10. The X-ray detector system of claim 1, wherein: the first plane
and the second plane are coincident; each of the first plurality of
parallel grid members is continuous; and each of the second
plurality of parallel grid members is discontinuous.
11. The X-ray detector system of claim 1, wherein: the first
plurality of parallel grid members are spaced having at least
substantially equivalent distances there-between; and the second
plurality of parallel grid members are spaced having at least
substantially equivalent distances there-between.
12. The X-ray detector system of claim 1, wherein the first
plurality of parallel grid members and second plurality of parallel
grid members are radiopaque.
13. The X-ray detector system of claim 1, wherein a portion of the
X-ray radiation passes through the item, and the portion of the
X-ray radiation that passes through the item also passes through
the X-ray penetration grid.
14. The X-ray detector system of claim 1, wherein the perimeter has
a second side, said second side being oriented in a third direction
at least substantially perpendicular to the first primary direction
and the second primary direction.
15. A computer implemented method for scanning an item, the method
comprising steps for: receiving, via a processor, one or more first
intensity signals indicative of a first intensity of X-ray
radiation received at each of a plurality of locations at a first
scan time on a detector, wherein: the detector is configured to
receive X-ray radiation from an X-ray emitter and to generate the
one or more intensity signals indicative of an intensity of the
received X-ray radiation at each of a plurality of locations on the
receiving surface; the X-ray radiation is emitted from the X-ray
emitter and at least a portion of the X-ray radiation passes
through the item and an X-ray penetration grid before being
received by the detector, wherein: the X-ray penetration grid
comprises a first grid structure comprising: a perimeter
surrounding the X-ray penetration grid having at least a first
side, said first side being oriented in a first primary direction;
a first plurality of parallel grid members each having a first end
and a second end; and a second plurality of parallel grid members
each having a first end and a second end; wherein: the first
plurality of parallel grid members are coincident with a first
plane; the second plurality of parallel grid members are coincident
with a second plane; the first plane and the second plane are at
least substantially parallel; the first end and the second end of
each of the first plurality of parallel grid members intersects the
perimeter at an angle such that the first plurality of parallel
grid members are neither parallel nor perpendicular to the first
side of the perimeter; and the first end and the second end of each
of the second plurality of parallel grid members intersects the
perimeter at an angle such that the second plurality of parallel
grid members are neither parallel nor perpendicular to the first
side of the perimeter; and the item and the X-ray penetration grid
are propelled in a second primary direction, said second primary
direction being substantially the same as the first primary
direction; causing, via a display device, display of the one or
more first intensity signals; receiving, via the processor, one or
more second intensity signals indicative of one or more ghosted
images extending from an edge of the item; causing, via the display
device, display of the one or more second intensity signals,
wherein the displayed second intensity signals comprises a
radiation ghost based at least in part on the one or more ghosted
images; and identifying, via the one or more processors, the
presence of a radiation ghost based at least in part on the second
intensity signals.
16. The computer implemented method for scanning an item of claim
15, wherein a first portion of the X-ray radiation passes through
the item, and the first portion of the X-ray radiation that passes
through the item also passes through the X-ray penetration
grid.
17. The computer implemented method for scanning an item of claim
15, further comprising steps for generating, via the one or more
processors, a notification indicating the item requires additional
processing to determine the item's contents.
18. The computer implemented method for scanning an item of claim
15, wherein the first plane is spaced a distance apart from the
second plane.
19. The computer implemented method for scanning an item of claim
15, wherein the angle at which the first end of each of the first
plurality of parallel grid members intersects the perimeter is
between 30 degrees and 55 degrees.
20. The computer implemented method for scanning an item of claim
19, wherein the angle at which the first end of each of the first
plurality of parallel grid members intersects the perimeter is 45
degrees.
21. The computer implemented method for scanning an item of claim
15, wherein the first plurality of parallel grid members and second
plurality of parallel grid members are radiopaque.
22. The computer implemented method for scanning an item of claim
15, wherein: the x-ray penetration grid further comprises: a second
grid structure comprising: a second perimeter surrounding the
second grid structure having at least a first side; a third
plurality of parallel grid members each having a first end and a
second end; and a fourth plurality of parallel grid members each
having a first end and a second end; wherein: the third plurality
of parallel grid members are coincident with a third plane; the
fourth plurality of parallel grid members are coincident with a
fourth plane; the third plane and the fourth plane are parallel;
the first end and the second end of each of the third plurality of
parallel grid members intersects the second perimeter at an angle
such that the third plurality of parallel grid members are neither
parallel nor perpendicular to the first side of the second
perimeter; the first end and the second end of each of the fourth
plurality of parallel grid members intersects the perimeter at an
angle such that the fourth plurality of parallel grid members are
neither parallel nor perpendicular to the first side of the second
perimeter; and the third plane and the fourth plane are
perpendicular to the first plane and the second plane; and a second
portion of the X-ray radiation passes through the item and the
second grid structure before being received by the detector such
that the second portion of the X-ray radiation does not pass
through the first grid structure.
23. An X-ray penetration grid comprising: a first grid structure
comprising: a perimeter surrounding the grid structure having at
least a first side; a first plurality of parallel grid members each
having a first end and a second end; and a second plurality of
parallel grid members each having a first end and a second end;
wherein: the first plurality of parallel grid members are
coincident with a first plane; the second plurality of parallel
grid members are coincident with a second plane; the first plane
and the second plane are parallel; the first end and the second end
of each of the first plurality of parallel grid members intersects
the perimeter at an angle such that the first plurality of parallel
grid members are neither parallel nor perpendicular to the first
side of the perimeter; and the first end and the second end of each
of the second plurality of parallel grid members intersects the
perimeter at an angle such that the second plurality of parallel
grid members are neither parallel nor perpendicular to the first
side of the perimeter.
24. The X-ray penetration grid of claim 23, wherein the perimeter
comprises a frame.
25. The X-ray penetration grid of claim 23, wherein the first plane
is spaced a distance apart from the second plane.
26. The X-ray penetration grid of claim 23, wherein the perimeter
is rectangular.
27. The X-ray penetration grid of claim 24, further comprising one
or more handles coupled to the frame.
28. The X-ray penetration grid of claim 23, wherein the angle at
which the first end of each of the first plurality of parallel grid
members intersects the perimeter is between 30 degrees and 55
degrees.
29. The X-ray penetration grid of claim 23, wherein the first
plurality of parallel grid members are perpendicular to the second
plurality of parallel grid members.
30. The X-ray penetration grid of claim 23, further comprising: a
second grid structure comprising: a second perimeter surrounding
the second grid structure having at least a first side; a third
plurality of parallel grid members each having a first end and a
second end; and a fourth plurality of parallel grid members each
having a first end and a second end; wherein: the third plurality
of parallel grid members are coincident with a third plane; the
fourth plurality of parallel grid members are coincident with a
fourth plane; the third plane and the fourth plane are parallel;
the first end and the second end of each of the third plurality of
parallel grid members intersects the second perimeter at an angle
such that the third plurality of parallel grid members are neither
parallel nor perpendicular to the first side of the second
perimeter; the first end and the second end of each of the fourth
plurality of parallel grid members intersects the perimeter at an
angle such that the fourth plurality of parallel grid members are
neither parallel nor perpendicular to the first side of the second
perimeter; and the third plane and the fourth plane are
perpendicular to the first plane and the second plane.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This patent application claims priority to and the benefit
of provisional application Ser. No. 61/873,541, filed Sep. 4, 2013,
the contents of which being hereby incorporated herein by reference
in their entirety.
BACKGROUND
[0002] X-ray scanning devices have historically been used in both
the medical and security industries. In security applications,
X-ray scanning devices have been used to display the contents of
travel bags, shipped items, and/or the like without requiring
personnel to undertake the cumbersome task of unpacking and/or
disassembling the item in question and subsequently re-packing
and/or reassembling the item for further processing. X-ray based
security systems have historically been used by airport security
entities (e.g., the United States Transportation Security
Administration) and common carriers (e.g., United Parcel Service of
America, Federal Express, and/or the like) to detect different
types of contraband that may be present in items such as baggage,
shipping packages, shipping containers, and the like.
[0003] In operation, X-ray radiation is transmitted through and/or
scattered from items within the baggage, packages, containers, and
the like. Various systems incorporate a mesh or grid that is placed
upon a conveyor belt along which the baggage, packages, containers,
and the like travel during the scanning process. For particularly
densely packed baggage, packages, containers, and the like, it is
important that X-ray radiation emitted by an X-ray scanning device
penetrate the entirety of the scanned item so as to provide a
desired degree of certainty that no contraband exists there-within.
Conventional mesh or grid structures have proven helpful in this
regard by placing such adjacent the baggage, package, container,
and the like, opposite a directional orientation of the X-ray
scanning device contained within the system. In this manner, such
mesh or grid structures provide a baseline indicator of
penetration, for example such that if the mesh or grid is visible
within a scan, the item has been sufficiently penetrated with the
scan for clearance or otherwise.
[0004] Although X-ray scanning devices may facilitate the security
screening process for items during processing, the physical
properties of X-ray radiation and X-ray detectors may, in various
circumstances, obscure objects or components visible in an item
scan. In general, X-ray radiation may comprise electromagnetic
waves having a wavelength between 0.01 and 10 nanometers. Such
electromagnetic waves propagate from an X-ray emitter through the
item to be scanned, and are collected by a detector positioned
opposite the item to be scanned from the X-ray emitter, the
detector comprising one or more detector elements configured to
measure the intensity of the transmitted radiation (i.e., the
electromagnetic wave) along a radiation ray projected from the
X-ray emitter to a detector element. In various embodiments, the
one or more detector elements may comprise solid-state detectors
generally utilized for digital imaging. The solid-state detectors
may comprise a luminescent conversion layer, for example, a
scintillator (e.g., a cesium iodide scintillator) in which the
radiation received by the solid-state detector causes the
scintillator to generate light pulses, which may subsequently be
converted into digital signals that may be transmitted to a user
device and displayed via a display device.
[0005] In various circumstances, such conversion layers may
maintain or trap radiation, and therefore cause "ghost" images to
be created in subsequent intensity signals. Such trapping effects
may be caused by, for example, incomplete charge dissipation or low
induced energy levels that do not decay prior to receiving
additional radiation for a subsequent scan. These residual signals
from a previous image remain in the detector and are superimposed
on a later generated image. Such effects may become more obvious as
the time between successive images is decreased, and the time for
previously trapped charge accumulation to decay is likewise
decreased. Moreover, stronger electromagnetic signals received by
the detector elements may require additional time for the residual
electromagnetic signal to decay between images.
[0006] As an item to be scanned moves to a scanning location within
an X-ray scanning device, the X-ray scanning device may cause
ghosted streaks to appear in a generated image. These ghosted
streaks may appear as solid lines resembling radiopaque objects
present within the scanned item. Where a radiopaque bar or other
thin radiopaque object is oriented at least substantially parallel
to the direction of travel of the item, ghosted streaks may appear
to extend the length of the radiopaque object. Such ghosted streaks
may cause an operator viewing the generated image to believe that
the X-ray beam penetrated completely through a radiopaque object.
Therefore, the operator may erroneously determine that the scanned
item is clear of any prohibited items even though a complete scan
was not performed on the item.
[0007] When associating a mesh or grid structure with items to be
scanned, the ghosting phenomenon described above may inadvertently
cause at least a portion of the mesh or grid structure to appear
visible in the created image, although the electromagnetic waves
did not penetrate completely through the item. For example, ghosted
streaks may appear to extend at least a portion of the grid
elements in the created image and the resulting image may therefore
show these ghosted streaks superimposed over items even where the
electromagnetic waves did not penetrate completely through the
item. Thus, the mesh or grid structure may be "ghosted" (i.e.,
appear) in a resulting scan image, even where the item being
scanned has not, in reality, been fully (or sufficiently)
penetrated to actually detect all portions of the conventional mesh
or grid. Consequently, personnel viewing the created image may be
led to believe that a complete scan through the entirety of an item
was achieved. This "ghosting" phenomena is referred to herein as
"ghosting," "ghosting lines," "ghost lines," "ghost images,"
"ghosted images," "ghost radiation," "ghost signals," and/or
"ghosted lines," all of which as should be understood to generally
and interchangeably describe this phenomena.
[0008] Historically, efforts to reduce the impact of ghosting have
focused on creating improved detector elements, or incorporating
complex algorithms utilized to minimize the impact of ghosting.
However, such solutions are prone to errors due at least in part to
electromagnetic noise and other imperfections in the received
signal. For example, even where grids are used, if such are
oriented in a manner that results in the grid lines thereof being
parallel to the direction of travel, ghosted lines may appear,
although such may contain certain distortions therein. While users
could conceivably identify such distortions, the risk of a user
overlooking a particular distortion remains prevalent. Thus, a need
exists for improved mesh or grid structures that substantially
minimize the impact of "ghosting" so as to ensure sufficient
penetration of all scanned items without resorting to secondary
item handling and the like.
BRIEF SUMMARY
[0009] Various embodiments of the present invention are directed to
X-ray detector systems for determining the contents of an item. The
X-ray detector systems may comprise: (1) an X-ray emitter
configured for emitting X-ray radiation; (2) a detector comprising
a receiving surface, the detector configured to receive the X-ray
radiation and to generate one or more intensity signals indicative
of an intensity of the received X-ray radiation at each of a
plurality of locations on the receiving surface; (3) an X-ray
penetration grid comprising a first grid structure comprising: a
perimeter surrounding the X-ray penetration grid having at least a
first side, said first side being oriented in a first primary
direction; a first plurality of parallel grid members each having a
first end and a second end; and a second plurality of parallel grid
members each having a first end and a second end; wherein: the
first plurality of parallel grid members are coincident with a
first plane; the second plurality of parallel grid members are
coincident with a second plane; the first plane and the second
plane are parallel; the first end and the second end of each of the
first plurality of parallel grid members intersects the perimeter
at an angle such that the first plurality of parallel grid members
are neither parallel nor perpendicular to the first side of the
perimeter; and the first end and the second end of each of the
second plurality of parallel grid members intersects the perimeter
at an angle such that the second plurality of parallel grid members
are neither parallel nor perpendicular to the first side of the
perimeter; and (4) a conveying mechanism configured for conveying
the item and the X-ray penetration grid in a second primary
direction to a location between the X-ray emitter and the detector,
said second primary direction being substantially the same as the
first primary of direction.
[0010] Other embodiments of the present invention are direct to
computer implemented methods for scanning an item. The computer
implemented method comprising steps for: (1) receiving, via a
processor, one or more first intensity signals indicative of a
first intensity of X-ray radiation received at each of a plurality
of locations at a first scan time on a detector, wherein: the
detector is configured to receive X-ray radiation from an X-ray
emitter and to generate the one or more intensity signals
indicative of an intensity of the received X-ray radiation at each
of a plurality of locations on the receiving surface; the X-ray
radiation is emitted from the X-ray emitter and at least a portion
of the X-ray radiation passes through the item and an X-ray
penetration grid before being received by the detector, wherein:
the X-ray penetration grid comprises a first grid structure
comprising: a perimeter surrounding the X-ray penetration grid
having at least a first side, said first side being oriented in a
first primary direction; a first plurality of parallel grid members
each having a first end and a second end; and a second plurality of
parallel grid members each having a first end and a second end;
wherein: the first plurality of parallel grid members are
coincident with a first plane; the second plurality of parallel
grid members are coincident with a second plane; the first plane
and the second plane are at least substantially parallel; the first
end and the second end of each of the first plurality of parallel
grid members intersects the perimeter at an angle such that the
first plurality of parallel grid members are neither parallel nor
perpendicular to the first side of the perimeter; and the first end
and the second end of each of the second plurality of parallel grid
members intersects the perimeter at an angle such that the second
plurality of parallel grid members are neither parallel nor
perpendicular to the first side of the perimeter; and the item and
the X-ray penetration grid are propelled in a second primary
direction, said second primary direction being substantially the
same as the first primary direction; (2) causing, via a display
device, display of the one or more first intensity signals; (3)
receiving, via the processor, one or more second intensity signals
indicative of one or more ghosted image extending from an edge of
the item; (4) causing, via the display device, display of the one
or more second intensity signals, wherein the displayed second
intensity signals comprises a radiation ghost based at least in
part on the one or more ghosted image; and (5) identifying, via the
one or more processors, the presence of a radiation ghost based at
least in part on the second intensity signals.
[0011] Alternative embodiments of the present invention are
directed to X-ray penetration grids comprising a first grid
structure comprising: (1) a perimeter surrounding the grid
structure having at least a first side; (2) a first plurality of
parallel grid members each having a first end and a second end; and
(3) a second plurality of parallel grid members each having a first
end and a second end; wherein: the first plurality of parallel grid
members are coincident with a first plane; the second plurality of
parallel grid members are coincident with a second plane; the first
plane and the second plane are parallel; the first end and the
second end of each of the first plurality of parallel grid members
intersects the perimeter at an angle such that the first plurality
of parallel grid members are neither parallel nor perpendicular to
the first side of the perimeter; and the first end and the second
end of each of the second plurality of parallel grid members
intersects the perimeter at an angle such that the second plurality
of parallel grid members are neither parallel nor perpendicular to
the first side of the perimeter. In various embodiments, the X-ray
penetration grid may additionally comprise a second grid structure
comprising: (1) a second perimeter surrounding the second grid
structure having at least a first side; (2) a third plurality of
parallel grid members each having a first end and a second end; and
(3) a fourth plurality of parallel grid members each having a first
end and a second end; wherein the third plurality of parallel grid
members are coincident with a third plane; the fourth plurality of
parallel grid members are coincident with a fourth plane; the third
plane and the fourth plane are parallel; the first end and the
second end of each of the third plurality of parallel grid members
intersects the second perimeter at an angle such that the third
plurality of parallel grid members are neither parallel nor
perpendicular to the first side of the second perimeter; the first
end and the second end of each of the fourth plurality of parallel
grid members intersects the perimeter at an angle such that the
fourth plurality of parallel grid members are neither parallel nor
perpendicular to the first side of the second perimeter; and the
third plane and the fourth plane are perpendicular to the first
plane and the second plane.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0012] Reference will now be made to the accompanying drawings,
which are not necessarily drawn to scale, and wherein:
[0013] FIG. 1 shows a block diagram of a system according to
various embodiments;
[0014] FIG. 2A is a schematic block diagram of a server according
to various embodiments;
[0015] FIG. 2B is a schematic block diagram of an exemplary mobile
device according to various embodiments;
[0016] FIGS. 3A-3C illustrate an X-ray Penetration Grid according
to various embodiments;
[0017] FIG. 4 illustrates another X-ray Penetration Grid according
to various embodiments;
[0018] FIGS. 5A-5B are schematic diagrams of an X-ray Penetration
Grid used with an X-ray scanner and a corresponding visual display
according to various embodiments;
[0019] FIGS. 6A-6B are schematic diagrams of an X-ray Penetration
Grid used with an X-ray scanner and a corresponding visual display
according to various embodiments;
[0020] FIGS. 7A-7B are schematic diagrams of an X-ray Penetration
Grid used with an X-ray scanner and a corresponding visual display
according to various embodiments;
[0021] FIGS. 8A-8B are schematic diagrams of an X-ray Penetration
Grid used with an X-ray scanner and a corresponding visual display
according to various embodiments;
[0022] FIGS. 9A-9B are schematic diagrams of an X-ray Penetration
Grid used with an X-ray scanner and a corresponding visual display
according to various embodiments;
[0023] FIG. 10A illustrates a block diagram of a method of using an
X-ray Penetration Grid according to various embodiments; and
[0024] FIG. 10B is a schematic block diagram of a process flow as
may be implemented via an visual module, an analysis module, and a
notification module, as each are also illustrated in FIG. 2A
according to various embodiments of the present invention.
DETAILED DESCRIPTION
[0025] The present invention will now be described more fully
hereinafter with reference to the accompanying drawings, in which
some, but not all embodiments of the invention are shown. Indeed,
the invention may be embodied in many different forms and should
not be construed as limited to the embodiments set forth herein.
Rather, these embodiments are provided so that this disclosure will
satisfy applicable legal requirements. Like numbers refer to like
elements throughout.
[0026] Overview
[0027] Various embodiments are directed to a system for identifying
radiopaque objects present in an item scanned using an X-ray
scanning device. The system may comprise an X-ray scanning device
comprising an X-ray emitter and a detector, a conveying mechanism,
and an X-ray penetration grid. The X-ray penetration grid may
comprise a radiopaque grid oriented such that the radiopaque grid
elements are neither parallel nor perpendicular to the direction of
travel of the conveying mechanism. In use, the item to be scanned
is oriented relative to the X-ray penetration grid such that, when
the item and X-ray penetration grid are located between the X-ray
emitter and the detector, X-ray waves produced by the X-ray emitter
that pass through the item to be scanned must also pass through the
X-ray penetration grid before reaching the detector. Because the
radiopaque grid elements are evenly spaced apart and neither
parallel nor perpendicular to the direction of travel of the
conveying mechanism, no ghosted grid elements are visible in the
generated image, such that radiopaque objects contained in a
scanned item are easily and/or accurately identified in the
generated image.
[0028] Moreover, various embodiments are directed to methods for
identifying radiopaque objects present in an item scanned using an
X-ray scanning device. An item is placed on a conveying mechanism
with an X-ray penetration grid, and is propelled into an X-ray
scanner device. As the item and X-ray penetration grid is scanned,
a detector receives radiation emitted from an X-ray emitter that
corresponds to the relative intensity of the radiation penetrating
the item and X-ray penetration grid and generates intensity signals
indicative of the relative intensity of the radiation received at
various locations on the detector. The detector then converts the
signals indicative of the relative intensity of the received
radiation into visible signals, which may be transmitted via a
network to one or more computing devices. In certain embodiments
the X-Ray scanning device may be configured to scan multiple slices
of each scanned item corresponding to different locations along the
length of the scanned item (the length of the scanned item being
parallel to the direction of travel). The one or more computing
devices subsequently display the visible signals to a user
monitoring the X-ray scanning device by piecing together the
individual slices of the item. At least in part because the
radiopaque grid elements are spaced evenly and are neither parallel
nor perpendicular to the direction of travel of the conveying
mechanism, the ghost lines are substantially, and in certain
embodiments entirely, eliminated such that virtually no ghost lines
are visible in the displayed visual image.
[0029] Exemplary Apparatuses, Methods, Systems, Computer Program
Products, & Computing Entities
[0030] Embodiments of the present invention may be implemented in
various ways, including as computer program products. A computer
program product may include a non-transitory computer-readable
storage medium storing applications, programs, program modules,
scripts, source code, program code, object code, byte code,
compiled code, interpreted code, machine code, executable
instructions, and/or the like (also referred to herein as
executable instructions, instructions for execution, program code,
and/or similar terms used herein interchangeably). Such
non-transitory computer-readable storage media include all
computer-readable media (including volatile and non-volatile
media).
[0031] In one embodiment, a non-volatile computer-readable storage
medium may include a floppy disk, flexible disk, hard disk,
solid-state storage (SSS) (e.g., a solid state drive (SSD), solid
state card (SSC), solid state module (SSM)), enterprise flash
drive, magnetic tape, or any other non-transitory magnetic medium,
and/or the like. A non-volatile computer-readable storage medium
may also include a punch card, paper tape, optical mark sheet (or
any other physical medium with patterns of holes or other optically
recognizable indicia), compact disc read only memory (CD-ROM),
compact disc compact disc-rewritable (CD-RW), digital versatile
disc (DVD), Blu-ray disc (BD), any other non-transitory optical
medium, and/or the like. Such a non-volatile computer-readable
storage medium may also include read-only memory (ROM),
programmable read-only memory (PROM), erasable programmable
read-only memory (EPROM), electrically erasable programmable
read-only memory (EEPROM), flash memory (e.g., Serial, NAND, NOR,
and/or the like), multimedia memory cards (MMC), secure digital
(SD) memory cards, SmartMedia cards, CompactFlash (CF) cards,
Memory Sticks, and/or the like. Further, a non-volatile
computer-readable storage medium may also include
conductive-bridging random access memory (CBRAM), phase-change
random access memory (PRAM), ferroelectric random-access memory
(FeRAM), non-volatile random-access memory (NVRAM),
magnetoresistive random-access memory (MRAM), resistive
random-access memory (RRAM), Silicon-Oxide-Nitride-Oxide-Silicon
memory (SONOS), floating junction gate random access memory (FJG
RAM), Millipede memory, racetrack memory, and/or the like.
[0032] In one embodiment, a volatile computer-readable storage
medium may include random access memory (RAM), dynamic random
access memory (DRAM), static random access memory (SRAM), fast page
mode dynamic random access memory (FPM DRAM), extended data-out
dynamic random access memory (EDO DRAM), synchronous dynamic random
access memory (SDRAM), double data rate synchronous dynamic random
access memory (DDR SDRAM), double data rate type two synchronous
dynamic random access memory (DDR2 SDRAM), double data rate type
three synchronous dynamic random access memory (DDR3 SDRAM), Rambus
dynamic random access memory (RDRAM), Twin Transistor RAM (TTRAM),
Thyristor RAM (T-RAM), Zero-capacitor (Z-RAM), Rambus in-line
memory module (RIMM), dual in-line memory module (DIMM), single
in-line memory module (SIMM), video random access memory VRAM,
cache memory (including various levels), flash memory, register
memory, and/or the like. It will be appreciated that where
embodiments are described to use a computer-readable storage
medium, other types of computer-readable storage media may be
substituted for or used in addition to the computer-readable
storage media described above.
[0033] As should be appreciated, various embodiments of the present
invention may also be implemented as methods, apparatus, systems,
computing devices, computing entities, and/or the like. As such,
embodiments of the present invention may take the form of an
apparatus, system, computing device, computing entity, and/or the
like executing instructions stored on a computer-readable storage
medium to perform certain steps or operations. However, embodiments
of the present invention may also take the form of an entirely
hardware embodiment performing certain steps or operations.
[0034] Various embodiments are described below with reference to
block diagrams and flowchart illustrations of apparatuses, methods,
systems, and computer program products. It should be understood
that each block of any of the block diagrams and flowchart
illustrations, respectively, may be implemented in part by computer
program instructions, e.g., as logical steps or operations
executing on a processor in a computing system. These computer
program instructions may be loaded onto a computer, such as a
special purpose computer or other programmable data processing
apparatus to produce a specifically-configured machine, such that
the instructions which execute on the computer or other
programmable data processing apparatus implement the functions
specified in the flowchart block or blocks.
[0035] These computer program instructions may also be stored in a
computer-readable memory that can direct a computer or other
programmable data processing apparatus to function in a particular
manner, such that the instructions stored in the computer-readable
memory produce an article of manufacture including
computer-readable instructions for implementing the functionality
specified in the flowchart block or blocks. The computer program
instructions may also be loaded onto a computer or other
programmable data processing apparatus to cause a series of
operational steps to be performed on the computer or other
programmable apparatus to produce a computer-implemented process
such that the instructions that execute on the computer or other
programmable apparatus provide operations for implementing the
functions specified in the flowchart block or blocks.
[0036] Accordingly, blocks of the block diagrams and flowchart
illustrations support various combinations for performing the
specified functions, combinations of operations for performing the
specified functions and program instructions for performing the
specified functions. It should also be understood that each block
of the block diagrams and flowchart illustrations, and combinations
of blocks in the block diagrams and flowchart illustrations, could
be implemented by special purpose hardware-based computer systems
that perform the specified functions or operations, or combinations
of special purpose hardware and computer instructions.
[0037] Exemplary Architecture of System 20
[0038] FIG. 1 is a block diagram of an X-ray penetration system 20
that can be used in conjunction with various embodiments of the
present invention. In at least the illustrated embodiment, the
system 20 may include one or more central computing devices 110,
one or more distributed computing devices 120, one or more
distributed handheld or mobile devices 300, and at least one
conveying mechanism 140 and X-ray penetration grid 150, all
configured in communication with a central server 200 via one or
more networks 130. While FIG. 1 illustrates the various system
entities as separate, standalone entities, the various embodiments
are not limited to this particular architecture.
[0039] According to various embodiments of the present invention,
the one or more networks 130 may be capable of supporting
communication in accordance with any of a number of
second-generation (2G), 2.5G, third-generation (3G), and/or
fourth-generation (4G) mobile communication protocols, or the like.
More particularly, the one or more networks 130 may be capable of
supporting communication in accordance with 2G wireless
communication protocols IS-136 (TDMA), GSM, and IS-95 (CDMA). Also,
for example, the one or more networks 130 may be capable of
supporting communication in accordance with 2.5G wireless
communication protocols GPRS, Enhanced Data GSM Environment (EDGE),
or the like. In addition, for example, the one or more networks 130
may be capable of supporting communication in accordance with 3G
wireless communication protocols such as Universal Mobile Telephone
System (UMTS) network employing Wideband Code Division Multiple
Access (WCDMA) radio access technology. Some narrow-band AMPS
(NAMPS), as well as TACS, network(s) may also benefit from
embodiments of the present invention, as should dual or higher mode
mobile stations (e.g., digital/analog or TDMA/CDMA/analog phones).
As yet another example, each of the components of the system 5 may
be configured to communicate with one another in accordance with
techniques such as, for example, radio frequency (RF),
Bluetooth.TM., infrared (IrDA), or any of a number of different
wired or wireless networking techniques, including a wired or
wireless Personal Area Network ("PAN"), Local Area Network ("LAN"),
Metropolitan Area Network ("MAN"), Wide Area Network ("WAN"), or
the like.
[0040] Although the device(s) 110-300 are illustrated in FIG. 1 as
communicating with one another over the same network 130, these
devices may likewise communicate over multiple, separate
networks.
[0041] According to one embodiment, in addition to receiving data
from the server 200, the distributed devices 110, 120, 140, and/or
300 may be further configured to collect and transmit data on their
own. In various embodiments, the devices 110, 120, 140, and/or 300
may be capable of receiving data via one or more input units or
devices, such as a keypad, touchpad, barcode scanner, radio
frequency identification (RFID) reader, interface card (e.g.,
modem, etc.) or receiver. The devices 110, 120, 140, and/or 300 may
further be capable of storing data to one or more volatile or
non-volatile memory modules, and outputting the data via one or
more output units or devices, for example, by displaying data to
the user operating the device, or by transmitting data, for example
over the one or more networks 130.
[0042] Exemplary Server 200
[0043] In various embodiments, the server 200 includes various
systems for performing one or more functions in accordance with
various embodiments of the present invention, including those more
particularly shown and described herein. It should be understood,
however, that the server 200 might include a variety of alternative
devices for performing one or more like functions, without
departing from the spirit and scope of the present invention. For
example, at least a portion of the server 200, in certain
embodiments, may be located on the distributed device(s) 110, 120,
140 and/or the handheld or mobile device(s) 300, as may be
desirable for particular applications. As will be described in
further detail below, in at least one embodiment, the handheld or
mobile device(s) 300 may contain one or more mobile applications
330 which may be configured so as to provide a user interface for
communication with the server 200, all as will be likewise
described in further detail below.
[0044] FIG. 2A is a schematic diagram of the server 200 according
to various embodiments. The server 200 includes a processor 230
that communicates with other elements within the server via a
system interface or bus 235. Also included in the server 200 is a
display/input device 250 for receiving and displaying data. This
display/input device 250 may be, for example, a keyboard or
pointing device that is used in combination with a monitor. The
server 200 further includes memory 220, which preferably includes
both read only memory (ROM) 226 and random access memory (RAM) 222.
The server's ROM 226 is used to store a basic input/output system
224 (BIOS), containing the basic routines that help to transfer
information between elements within the server 200. Various ROM and
RAM configurations have been previously described herein.
[0045] In addition, the server 200 includes at least one storage
device or program storage 210, such as a hard disk drive, a floppy
disk drive, a CD Rom drive, or optical disk drive, for storing
information on various computer-readable media, such as a hard
disk, a removable magnetic disk, or a CD-ROM disk. As will be
appreciated by one of ordinary skill in the art, each of these
storage devices 210 are connected to the system bus 235 by an
appropriate interface. The storage devices 210 and their associated
computer-readable media provide nonvolatile storage for a personal
computer. As will be appreciated by one of ordinary skill in the
art, the computer-readable media described above could be replaced
by any other type of computer-readable media known in the art. Such
media include, for example, magnetic cassettes, flash memory cards,
digital video disks, and Bernoulli cartridges.
[0046] Although not shown, according to an embodiment, the storage
device 210 and/or memory of the server 200 may further provide the
functions of a data storage device, which may store historical
and/or current delivery data and delivery conditions that may be
accessed by the server 200. In this regard, the storage device 210
may comprise one or more databases. The term "database" refers to a
structured collection of records or data that is stored in a
computer system, such as via a relational database, hierarchical
database, or network database and as such, should not be construed
in a limiting fashion.
[0047] A number of program modules 400, 425, 450 comprising, for
example, one or more computer-readable program code portions
executable by the processor 230, may be stored by the various
storage devices 210 and within RAM 222. Such program modules may
also include an operating system 280. In these and other
embodiments, the various modules 400, 425, 450 control certain
aspects of the operation of the server 200 with the assistance of
the processor 230 and operating system 280. For example, a Visual
Module 400 may be configured to covert signals received from the
X-ray scanning device 140 into visible signals to be displayed via
the display/input device 250; an Analysis Module 425 may be
configured to identify a visual ghosting phenomenon; and a
Notification Module 450 may be configured to notify relevant
personnel of the presence of a ghosting phenomenon in a presented
visual display. In still other embodiments, it should be understood
that one or more additional and/or alternative modules may also be
provided, without departing from the scope and nature of the
present invention.
[0048] In various embodiments, the program modules 400, 425, 450
are executed by the server 200 and are configured to generate one
or more graphical user interfaces, reports, instructions, and/or
notifications/alerts, all accessible and/or transmittable to
various users of the system 20. In certain embodiments, the user
interfaces, reports, instructions, and/or notifications/alerts may
be accessible via one or more networks 130, which may include the
Internet or other feasible communications network, as previously
discussed.
[0049] In various embodiments, it should also be understood that
one or more of the modules 400, 425, 450 may be alternatively
and/or additionally (e.g., in duplicate) stored locally on one or
more of the devices 110, 120, 140, and/or 300 and may be executed
by one or more processors of the same. According to various
embodiments, the modules 400, 425, 450 may send data to, receive
data from, and utilize data contained in one or more databases,
which may be comprised of one or more separate, linked and/or
networked databases.
[0050] Also located within the server 200 is a network interface
260 for interfacing and communicating with other elements of the
one or more networks 130. It will be appreciated by one of ordinary
skill in the art that one or more of the server 200 components may
be located geographically remotely from other server components.
Furthermore, one or more of the server 200 components may be
combined, and/or additional components performing functions
described herein may also be included in the server.
[0051] While the foregoing describes a single processor 230, as one
of ordinary skill in the art will recognize, the server 200 may
comprise multiple processors operating in conjunction with one
another to perform the functionality described herein. In addition
to the memory 220, the processor 230 can also be connected to at
least one interface or other means for displaying, transmitting
and/or receiving data, content or the like. In this regard, the
interface(s) can include at least one communication interface or
other means for transmitting and/or receiving data, content or the
like, as well as at least one user interface that can include a
display and/or a user input interface, as will be described in
further detail below. The user input interface, in turn, can
comprise any of a number of devices allowing the entity to receive
data from a user, such as a keypad, a touch display, a joystick or
other input device.
[0052] Still further, while reference is made to the "server" 200,
as one of ordinary skill in the art will recognize, embodiments of
the present invention are not limited to traditionally defined
server architectures. Still further, the system of embodiments of
the present invention is not limited to a single server, or similar
network entity or mainframe computer system. Other similar
architectures including one or more network entities operating in
conjunction with one another to provide the functionality described
herein may likewise be used without departing from the spirit and
scope of embodiments of the present invention. For example, a mesh
network of two or more personal computers (PCs), similar electronic
devices, or handheld portable devices, collaborating with one
another to provide the functionality described herein in
association with the server 200 may likewise be used without
departing from the spirit and scope of embodiments of the present
invention.
[0053] According to various embodiments, many individual steps of a
process may or may not be carried out utilizing the computer
systems and/or servers described herein, and the degree of computer
implementation may vary, as may be desirable and/or beneficial for
one or more particular applications.
[0054] Distributed Handheld (or Mobile) Device(s) 300
[0055] FIG. 2B provides an illustrative schematic representative of
a mobile device 300 that can be used in conjunction with various
embodiments of the present invention. Mobile devices 300 can be
operated by various parties. As shown in FIG. 2B, a mobile device
300 may include an antenna 312, a transmitter 304 (e.g., radio), a
receiver 306 (e.g., radio), and a processing element 308 that
provides signals to and receives signals from the transmitter 304
and receiver 306, respectively.
[0056] The signals provided to and received from the transmitter
304 and the receiver 306, respectively, may include signaling data
in accordance with an air interface standard of applicable wireless
systems to communicate with various entities, such as the server
200, the distributed devices 110, 120, 140 and/or the like. In this
regard, the mobile device 300 may be capable of operating with one
or more air interface standards, communication protocols,
modulation types, and access types. More particularly, the mobile
device 300 may operate in accordance with any of a number of
wireless communication standards and protocols. In a particular
embodiment, the mobile device 300 may operate in accordance with
multiple wireless communication standards and protocols, such as
GPRS, UMTS, CDMA2000, 1xRTT, WCDMA, TD-SCDMA, LTE, E-UTRAN, EVDO,
HSPA, HSDPA, Wi-Fi, WiMAX, UWB, IR protocols, Bluetooth protocols,
USB protocols, and/or any other wireless protocol.
[0057] Via these communication standards and protocols, the mobile
device 300 may according to various embodiments communicate with
various other entities using concepts such as Unstructured
Supplementary Service data (USSD), Short Message Service (SMS),
Multimedia Messaging Service (MMS), Dual-Tone Multi-Frequency
Signaling (DTMF), and/or Subscriber Identity Module Dialer (SIM
dialer). The mobile device 300 can also download changes, add-ons,
and updates, for instance, to its firmware, software (e.g.,
including executable instructions, applications, program modules),
and operating system.
[0058] According to one embodiment, the mobile device 300 may
include a location determining device and/or functionality. For
example, the mobile device 300 may include a GPS module adapted to
acquire, for example, latitude, longitude, altitude, geocode,
course, and/or speed data. In one embodiment, the GPS module
acquires data, sometimes known as ephemeris data, by identifying
the number of satellites in view and the relative positions of
those satellites.
[0059] The mobile device 300 may also comprise a user interface
(that can include a display 316 coupled to a processing element
308) and/or a user input interface (coupled to a processing element
308). The user input interface can comprise any of a number of
devices allowing the mobile device 300 to receive data, such as a
keypad 318 (hard or soft), a touch display, voice or motion
interfaces, or other input device. In embodiments including a
keypad 318, the keypad can include (or cause display of) the
conventional numeric (0-9) and related keys (#, *), and other keys
used for operating the mobile device 300 and may include a full set
of alphabetic keys or set of keys that may be activated to provide
a full set of alphanumeric keys. In addition to providing input,
the user input interface can be used, for example, to activate or
deactivate certain functions, such as screen savers and/or sleep
modes.
[0060] The mobile device 300 can also include volatile storage or
memory 322 and/or non-volatile storage or memory 324, which can be
embedded and/or may be removable. For example, the non-volatile
memory may be ROM, PROM, EPROM, EEPROM, flash memory, MMCs, SD
memory cards, Memory Sticks, CBRAM, PRAM, FeRAM, RRAM, SONOS,
racetrack memory, and/or the like. The volatile memory may be RAM,
DRAM, SRAM, FPM DRAM, EDO DRAM, SDRAM, DDR SDRAM, DDR2 SDRAM, DDR3
SDRAM, RDRAM, RIMM, DIMM, SIMM, VRAM, cache memory, register
memory, and/or the like. The volatile and non-volatile storage or
memory can store databases, database instances, database mapping
systems, data, applications, programs, program modules, scripts,
source code, object code, byte code, compiled code, interpreted
code, machine code, executable instructions, and/or the like to
implement the functions of the mobile device 300.
[0061] The mobile device 300 may also include one or more of a
camera 326 and a mobile application 330. The camera 326 may be
configured according to various embodiments as an additional and/or
alternative data collection feature, whereby one or more items may
be read, stored, and/or transmitted by the mobile device 300 via
the camera. The mobile application 330 may further provide a
feature via which various tasks may be performed with the mobile
device 300. Various configurations may be provided, as may be
desirable for one or more users of the mobile device 300 and the
system 20 as a whole.
[0062] X-Ray Penetration Grid (XPG)
[0063] FIGS. 3A-3C illustrate an exemplary XPG 150 according to
various embodiments. As shown therein, an XPG 150 may comprise a
frame 151, a first plurality of grid members 152, and a second
plurality of grid members 152. In various embodiments, one or more
handles 154 may be coupled to the frame 151 to facilitate
transportation of the XPG 150. In various embodiments, an XPG 150
may comprise 4 or more handles 154. Such handles 154 may be located
at least substantially near the center point of each side of the
XPG 150. Alternatively, such handles may be located at least
substantially near each corner of the XPG 150. Any of a variety of
configurations and handle locations as maybe desirable are
possible.
[0064] FIG. 3A illustrates a top view of an XPG 150 according to
various embodiments. As shown therein, the frame 151 may be at
least substantially rectangular, and may be at least substantially
square in shape, although substantially any shape may be utilized.
As a non-limiting example, the sides of the XPG 150 need not be
parallel or perpendicular, and may have a parallelogram shape. In
various embodiments, the XPG 150 may be sized such that the XPG
fits onto a conveying mechanism 141, onto a pallet, onto a trailer,
or onto other vehicles that may travel through an X-ray scanning
device 140 with an item 10 to be scanned. As non-limiting examples,
the sides of the XPG 150 may be at least substantially 800 mm in
length, or at least substantially 516 mm in length.
[0065] In various embodiments, the first plurality of grid members
152 and second plurality of grid members 153 may each comprise a
plurality of at least substantially parallel grid members spaced at
substantially equivalent intervals (e.g., 1 inch). Alternatively,
the first plurality of grid members 152 may comprise a plurality of
at least substantially parallel grid members spaced at varying
intervals. Likewise, the second plurality of grid members 153 may
comprise a plurality of at least substantially parallel grid
members spaced at varying intervals. Moreover, the first plurality
of grid members 152 may be spaced at intervals different from the
spacing intervals of the second plurality of grid members 153, such
that the resulting spaces between the grid members have varying
side lengths. As a non-limiting example, the spaces between the
grid members 152, 153 may be rectangular in shape and have multiple
side lengths.
[0066] The first plurality of grid members 152 may reside within a
first plane that is parallel to, and spaced apart from, a second
plane in which the second plurality of grid members 153 resides.
Alternatively, the first plane and second plane may be coincident,
such that the first plurality of grid members 152 and second
plurality of grid members 153 reside in a single plane.
[0067] In various embodiments, the grid members 152, 153 may be
elongated rods having a circular cross-section (as described
herein), although any of a variety of cross-sectional shapes may be
utilized (e.g., square, rectangular, triangular, circular, and/or
the like). The first plurality of grid members 152 and second
plurality of grid members 153 may be coupled to the frame 151 of
the XPG 150 using one or more fasteners. As a non-limiting example,
such fasteners may comprise a weld, an ultrasonic weld, an
adhesive, a screw, a bolt, and/or the like. Similarly, one or more
of the first plurality of grid members 152 may be coupled to one or
more of the second plurality of grid members 153 using one or more
fasteners such as those described above. In various embodiments,
one or more of the first plurality of grid members 152 may be
coupled (e.g., welded) to one or more of the second plurality of
grid members 153 at one or more cross points defined as each
location within the XPG 150 where one of the first plurality of
grid members 152 is in contact with one of the second plurality of
grid members 153. As a non-limiting example, the first plurality of
grid members 152 is coupled (e.g., welded) to the second plurality
of grid members 153 at each cross point.
[0068] As illustrated in FIG. 3A, the first plurality of grid
members 152 crosses the second plurality of grid members 153 at an
angle .gamma.. In various embodiments, the angle .gamma. is between
75 degrees and 105 degrees, although preferably at least
substantially 90 degrees. In various embodiments, the first
plurality of grid members 152 and second plurality of grid members
153 may have at least substantially equivalent spacing, such that
the resulting gaps within the grid or mesh structure are at least
substantially square (e.g., 1 inch squares). Moreover, the first
plurality of grid members 152 and second plurality of grid members
153 intersect the frame 151 at angles .alpha. and .beta.,
respectively. In various embodiments, angles .alpha. and .beta. are
between 30 degrees and 55 degrees, although preferably at least
substantially 45 degrees. In various embodiments where angle
.gamma. is 90 degrees, angles .alpha. and .beta. may be equivalent.
As illustrated in FIG. 3A, the XPG 150 may have a length l and a
width w. In various embodiments the length l and width w may be at
least substantially equivalent, such that the XPG 150 is square in
shape. As non-limiting examples, the length l and width w may be
800 mm or 516 mm. However, the length l and width w need not be
equivalent.
[0069] FIG. 3B illustrates a side view of an XPG 150 according to
various embodiments. As illustrated in FIG. 3B, the frame 151 may
have a thickness t.sub.frame sized such that t.sub.frame is at
least as large as the combined diameter, width, thickness, height,
or other words used herein, of the first plurality of grid members
152 and second plurality of grid members 153. In various
embodiments, the first plurality of grid members 152 and second
plurality of grid members 153 may be in separate parallel planes,
such that the first plurality of grid members 152 may be
substantially adjacent the second plurality of grid members 153
such that the first plurality of grid members is above the second
plurality of grid members when the XPG 150 is placed horizontally.
Alternatively, the first plurality of grid members 152 and second
plurality of grid members 153 may be in coincident planes, such
that segments of each of the second plurality of grid members
resides between each of the first plurality of grid members, or
vice versa. As a non-limiting example, the second plurality of grid
members 153 may be discontinuous elements, such that segments of
each of the second plurality of grid members resides between
continuous grid members of the first plurality of grid members 152.
Where the first plurality of grid members 152 and second plurality
of grid members 153 reside in different planes, each of the
plurality of grid members 152, 153 may be continuous elements.
[0070] FIG. 3C illustrates an exemplary cross sectional view of a
grid member such as that in the first plurality of grid members 152
and second plurality of grid members 153. As shown therein, the
grid members 152, 153 may have an at least substantially circular
cross section, although any of a variety of cross-sectional shapes
may be utilized (e.g., square, rectangular, triangular, circular,
and/or the like).
[0071] Moreover, the first plurality of grid members 152 and second
plurality of grid members 153 may be radiopaque, such that
radiation does not pass through the grid members. As a non-limiting
example, the grid members 152, 153 may comprise 6 mm diameter solid
steel bars configured to prevent X-ray radiation from passing
through the grid members. Alternatively, any of a variety of
radiopaque materials (e.g., lead) and configurations (e.g., hollow
bars) may be utilized.
[0072] FIG. 4 illustrates a diagram of an XPG assembly 550
according to various embodiments. As shown in FIG. 4, the XPG
assembly 550 may comprise a first grid portion 551, a second grid
portion 552, and one or more supports 553. In various embodiments,
the first grid portion 551 and second grid portion 552 may be in a
perpendicular arrangement, and the support 553 may be configured to
maintain the perpendicular arrangement. In various embodiments, a
first end portion of the support 553 may be coupled to the first
grid portion 551 using one or more fasteners such as those
described above and a second end portion of the support may be
coupled to the second grid portion 552 using one or more fasteners
such as those described above. As a non-limiting example, the one
or more fasteners may comprise a weld, an ultrasonic weld, an
adhesive, a screw, a bolt, and/or the like. Moreover, as
illustrated in FIG. 4, the XPG assembly 550 may be coupled to a
support structure 554 or other transport vehicle. As non-limiting
examples, such transport vehicles may comprise wooden pallets,
plastic pallets, trailers, containers, crates, boxes, cages,
luggage, cases, and/or the like. In various embodiments, the
support structure 554 may be configured to facilitate movement of
the XPG assembly 550 via a fork-truck without a separate
pallet.
[0073] As previously mentioned, various embodiments described
herein provide a unique XPG 150 that may be oriented relative to an
X-ray scanning device 140 to ensure that the entire contents of a
scanned item 10 have been penetrated. In addition to comprising
radiopaque grid elements oriented so as to substantially prevent or
minimize a ghosting phenomenon, the grid elements may provide a
reference indicative of a unit of measure. For example, the grid
elements may be spaced to form 1 inch square spaces therebetween
and may be utilized as a length reference for an item 10 being
scanned.
[0074] The density of the material used within the mesh or grid
structure is further sufficiently thick to absorb X-ray radiation
penetrating the item(s) 10 being scanned (i.e., radiopaque), such
that the mesh or grid structure appears in any resulting scanned
image in an accurate and reliable manner only when the item(s) have
been fully penetrated by the X-ray radiation 145 imposed thereon.
In various embodiments, the material used within the mesh or grid
structure is mild steel (plain-carbon steel), although any
radiopaque material may be utilized. The mild steel used within the
mesh or grid structure may have a density of approximately 7.85
g/cm.sup.3, and may contain approximately 0.05% to 0.3% carbon
measured by weight. The problem of shadowing or "ghosting" may be
understood with reference to a non-limiting example of the
screening of dense magazines and newspapers destined for passenger
aircraft. Screening companies could not prove to the appropriate
authority that they could see through the magazines and paperwork.
Indeed, when examined with only partial grid or mesh structures
placed adjacent packages, containers, and the like containing such
dense items, X-ray imaging results indicated the existence of a
full grid or mesh structure. In other words, as previously
mentioned, the X-ray imaging results were shadowing or "ghosting"
the remainder of the non-existing grid, thus rendering scan and/or
penetration results ambiguous and inconclusive. Such ghost images
may extend from the edges of one or more grid elements aligned at
least substantially parallel to the direction of travel, and may
appear superimposed over a dense item in the generated image.
[0075] From a practical perspective, the shadowing or "ghosting"
should be understood to exist at least in part due to the relative
orientation of the grid elements formed within such mesh or grid
structures 150. For example, where such are aligned substantially
parallel to the direction of travel of an item 10, a ghosted image
may appear to include an extension of the mesh or grid structure
such that a radiopaque object within the scanned item is obscured.
A solution is to orient the grid elements within the grid or mesh
structures other than at 0 or 90 degree angles relative to the
direction of travel of the package. An optimal angle is at least
substantially 45 degrees, although angles in ranges of +/-15
degrees relative to a 45 degree angle may be beneficial as well.
Still other angular orientations may provide accurate results for
particular applications. As previously noted, such angles relative
to the direction of travel may be achieved utilizing an XPG having
a first plurality of grid members 152 and second plurality of grid
members 153 oriented such that angles .alpha. and .beta. between
the grid members and the frame 151 are at least substantially 45
degrees. Such XPG may be placed such that a first side of the frame
is at least substantially parallel to the direction of travel.
[0076] The impact of ghosted images may be mitigated or
substantially prevented when the XPG is oriented such that the
first plurality of grid members 152 and second plurality of grid
members 153 are neither parallel nor perpendicular to the direction
of travel (e.g., at substantially 45 degrees to the direction of
travel), such that the edges of the grid members 152, 153 are not
substantially parallel to the direction of travel. As a
non-limiting example, when the XPG is oriented such that the first
plurality of grid members 152 and second plurality of grid members
153 are not parallel to the direction of travel (e.g., at
substantially 45 degrees to the direction of travel), ghosted
images of the grid or mesh structure are substantially, and in
certain embodiments entirely, eliminated such that virtually no
ghosted images are visible in the generated image. Moreover, in
various circumstances, ghosting may be minimized or substantially
prevented by orienting grid members 152, 153 such that they are
neither parallel nor perpendicular to the direction of travel. Such
orientation ensures no edges of grid elements 152, 153 are at least
substantially parallel to the direction of travel, and therefore
the resulting image does not comprise ghost images resembling
extensions of one or more grid elements. By orienting the grid
members 152, 153 such that they are neither parallel nor
perpendicular to the direction of travel, any potential ghost
images that may result from moving the item and XPG to the scanning
location may be minimized or substantially prevented.
[0077] Orientation of an XPG Relative to an X-Ray Scanning
Device
[0078] FIGS. 5A and 5B to FIGS. 9A and 9B illustrate schematic
diagrams of exemplary methods of using an XPG according to various
embodiments of the present invention.
[0079] As shown in FIG. 5A, an XPG 150 may be utilized with an
X-ray scanning device 140 utilizing an X-ray emitter 142 located
above a conveying mechanism 141 according to various embodiments of
the present invention. As illustrated in FIG. 5A, X-ray radiation
(electromagnetic waves) 145 may be emitted from the X-ray emitter
142 and received by a detector 143. Although illustrated as a
single component, the detector 143 may comprise a detector array
comprising multiple detectors each comprising a conversion layer
configured for receiving X-ray radiation and converting the
received radiation into visible signals corresponding to the
relative intensities of the received radiation. Thus, the X-ray
scanning device 140 may be configured to scan one or more items 10
while the item is being propelled by the conveying mechanism 141.
Although illustrated as a conveyor belt, the conveying mechanism
may comprise any of a plurality of conveying mechanisms, such as,
for example, a slide, chute, bottle conveyor, open or enclosed
track conveyor, I-beam conveyor, cleated conveyor, and/or the
like.
[0080] FIG. 5B illustrates an exemplary visual display 600 of the
item 10 arranged on the XPG 150 being scanned. As illustrated
therein, as least a portion of the grid or mesh structure located
directly adjacent (e.g., above or below) the item 10 being scanned
is still visible in the visual display 600. However, if a
particularly dense object is contained within the item 10, the
portion of grid or mesh structure located adjacent the dense object
would not be visible in the visible display 600.
[0081] Referring again to FIG. 5A, in order to utilize the XPG 150,
the XPG is oriented such that at least one side of the frame is
parallel to the direction of travel of the conveying mechanism 141.
Consequently, the first plurality of grid members 152 and second
plurality of grid members 153 are oriented at an angle with respect
to the direction of travel other than 90 degrees or 0 degrees
(e.g., at least substantially 45 degrees). An item 10 to be scanned
is placed such that the radiation 145 will pass through both the
item and the XPG 150 before being received by the detector 143. As
a non-limiting example, the item 10 may be placed on top of the XPG
150.
[0082] FIGS. 6A and 7A illustrate schematic diagrams of an item 10
being scanned by an X-ray scanning device 140 having an alternative
configuration. Specifically, the X-ray emitter 142 shown in FIGS.
6A and 7A is located on a first side of the X-ray scanning device
140 and emits X-ray radiation 145 in a direction perpendicular to
the direction of travel of the item 10. As shown in FIG. 6A, an XPG
assembly 550 may be utilized such that at least one of the first
grid portion 551 and second grid portion 552 is visible in the
visible display 600. In various embodiments, each of the first grid
portion 551 and second grid portion 552 may have a configuration
substantially similar to XPG 150.
[0083] Referring now to FIG. 6A and the corresponding FIG. 6B,
which illustrates an exemplary visual display 600 corresponding to
a scanned item 10 having an orientation shown in FIG. 6A; at least
a portion of the scanned item (located between radiation line 145a
and radiation line 145b) is scanned without a corresponding portion
of the XPG 550. Only the portion of the item 10 located between
radiation line 145b and 145c (illustrated as portion 600b in FIG.
6B) is scanned with a corresponding portion of the XPG assembly 550
usable as a reference. Consequently, the XPG 550 does not provide a
reference for determining whether an item was scanned throughout
the entire depth of the item 10 over the portion of the item
located between radiation line 145a and radiation line 145b
(illustrated as portion 600a in FIG. 6B). Thus, a dense object
located within this portion of the item 10 may not be identified by
personnel operating the X-ray scanning device 140.
[0084] Referring now to FIG. 7A and the corresponding FIG. 7B,
which illustrates an exemplary visual display 600 corresponding to
a scanned item 10 having an orientation shown in FIG. 7A; the
entirety of the item is scanned with a corresponding portion of the
XPG assembly 550 usable as a reference. As illustrated in FIG. 7B,
at least a portion of the XPG assembly 550 may be used as a
reference for the entirety of the scanned item 10.
[0085] FIGS. 8A and 9A illustrate exemplary schematic diagrams of
an item 10 being scanned by an X-ray scanning device 140 having yet
another configuration. Specifically, the X-ray emitter 142 shown in
FIGS. 8A and 9A is located above the item to be scanned 10 and on a
first side of the item to be scanned.
[0086] Referring now to FIG. 8A and the corresponding FIG. 8B,
which illustrates an exemplary visual display 600 corresponding to
a scanned item 10 having an orientation shown in FIG. 8A; at least
a portion of the scanned item (located between radiation line 145a
and radiation line 145b) is scanned without a corresponding portion
of the XPG assembly 550 usable as a reference, and at least a
portion of the scanned item (located between radiation line 145c
and 145d is scanned with two corresponding portions of the XPG such
that the scanned area is obscured by the XPG. Only the portion of
the item 10 between radiation line 145b and radiation line 145c
(illustrated as portion 600b in FIG. 8A) is scanned with a single
portion of the XPG assembly 550 usable as a reference. A dense
object located in the portion of the item 10 between radiation line
145a and radiation line 145b (illustrated as portion 600a in FIG.
8B) may not be identified by personnel operating the X-ray scanning
device 140. A dense object located in the portion of the item 10
between radiation line 145c and radiation line 145d (illustrated as
portion 600c in FIG. 8B) may be obscured by the two portions of the
XPG 550 through which the radiation passes between the X-ray
emitter 142 and the detector 143.
[0087] Referring now to FIG. 9A and the corresponding FIG. 9B,
which illustrates an exemplary visual display 600 corresponding to
a scanned item 10 having an orientation shown in FIG. 9A; the
entirety of the item is scanned with a single corresponding portion
of the XPG assembly 550 usable as a reference. As illustrated in
FIG. 9B, at least a portion of the XPG assembly 550 may be used as
a reference for the entirety of the scanned item 10.
[0088] Method of Use
[0089] FIG. 10A illustrates an exemplary flowchart of a method of
using an XPG 150 (or XPG assembly 550) according to various
embodiments. As shown therein, the method begins at block 1001,
wherein the item 10 and XPG 150 (or XPG assembly 550) is oriented
relative to a conveying mechanism 141 such that the grid members
152, 153 are not parallel to the direction of travel of the
conveying mechanism 141. As previously noted, the item 10 may be
oriented relative the XPG 150 (or XPG assembly 550) such that
radiation from the X-ray emitter 142 passes through both the item
and XPG before reaching the detector. Preferably, the item 10 is
arranged relative to the XPG 150 (or XPG assembly 550) such that
radiation 145 cannot travel through any portion of the item without
also passing through the XPG. Thus, the XPG 150 (or XPG assembly
550) may be used as a scan depth reference over the entirety of the
scanned item 10.
[0090] Referring again to FIG. 10A, the item 10 and XPG 150 (or XPG
assembly 550) is conveyed into the X-ray scanning device 140 at
block 1002. The conveying mechanism 141 may be configured to propel
an item 10 and XPG 150 (or XPG assembly 550) at a velocity such
that the X-ray scanner device 140 may record multiple scans of each
item while the item is within the X-ray scanner device. As a
non-limiting example, the X-ray scanner device 140 may be
configured to scan a plurality of slices of each item 10. Each
successive slice may be at least substantially perpendicular to the
direction of travel, and may be scanned as a portion of the item 10
is propelled through a scanning area. In various embodiments, the
conveying mechanism 141 may operate continuously at a particular
velocity, or it may be configured to temporarily stop moving while
the X-ray scanner device 140 scans each item 10. While the item 10
and XPG 150 (or XPG assembly 550) are located within the X-ray
scanning device 140, the X-ray emitter 142 emits X-ray radiation
145 through the item 10 and XPG 150 (or XPG assembly 550). In
various embodiments, the X-ray emitter 142 may be operating
constantly while the X-ray scanner device 140 is operating, such
that the X-ray emitter 142 emits pulses of radiation to create
X-ray images at least periodically (e.g., every 10 seconds, every 5
seconds, every second, every 500 milliseconds, every 250
milliseconds, every 100 milliseconds, every 10 milliseconds, and/or
the like).
[0091] The radiation 145 emitted by the X-ray emitter 142 is
received by the detector 143 at block 1004. At block 1005 the
detector 143 determines the relative intensity of the radiation 145
received at each of a plurality of locations on the surface of the
detector 143. The relative intensity of the radiation 145 received
at each of the plurality of locations may be indicative of the
location of various objects having differing densities within the
item 10. The grid members 152, 153 of the XPG 150 (or XPG assembly
550) may be radiopaque, such that the detector 143 may detect a
negligible or nonexistent intensity of radiation 145 at locations
corresponding to the grid members. As a result, the relative
intensity of the radiation 145 received by the detector 143 may be
indicative of a radiopaque grid or mesh structure in addition to
any radiation passed through the spaces in the grid or mesh
structure of the XPG 150 (or XPG assembly 550).
[0092] At block 1006, the intensity data indicative of the relative
intensity of the radiation 145 received by the detector 143 is
generated. In various embodiments, the intensity data may be
transmitted via one or more networks 130 to one or more central
computing devices 110, the central server 200, one or more mobile
devices 300, and/or one or more distributed computing devices
120.
[0093] As previously indicated, the detector 143 may trap a portion
of the radiation 145 received from a previous emission 42 within
the detector such that the radiation does not dissipate prior to
receiving a subsequent emission of radiation. As a result, the
intensity data generated based at least in part on the relative
intensity of the radiation 145 received by the detector 143 may be
amplified due to the trapped radiation present in the detector. As
a simplified, non-limiting example, as a result of a first
radiation emission by the X-ray emitter 142, the detector 143
determines that no items are placed on an XPG 150 (or XPG assembly
550). The intensity data generated by the detector 143 indicates
that no radiation was received at locations corresponding to the
radiopaque grid members 152, 153, and a maximum amount of radiation
was received at all other locations (e.g., locations corresponding
to the spaces between grid members). As a result of a second
radiation emission by the X-ray emitter 142 occurring immediately
following the first radiation emission (e.g., before the detector
response generated based on the first emission fully decays), the
detector 143 receives radiation with relative intensities
indicative of a radiopaque object located on an XPG 150 (or XPG
assembly 550). Therefore, at all locations corresponding to the
radiopaque object, the detector receives substantially no radiation
145. However, because the previous detector response had not fully
decayed, the generated intensity data corresponding to the second
emission indicates that "ghost" radiation was received at all
locations corresponding to the spaces between grid members 152,
153, including those detector locations also corresponding to the
location of the radiopaque object. As a result, the intensity data
may appear to indicate that the radiopaque object allowed a small
amount of radiation 145 to pass therethrough.
[0094] Although the previously presented example simplifies the
process of receiving radiation 145 and generating intensity data
including ghost radiation as the conveying mechanism 141 propels an
item 10 and XPG 150 (or XPG assembly 550) into the X-ray scanning
device 140, each of the plurality of locations of the detector 143
may receive varying intensities of radiation 145. Therefore, where
an item 10 is oriented such that a volume of low density (allowing
a higher intensity of radiation 145 to pass through the low density
volume) is located downstream from a radiopaque volume, the
ghosting phenomenon may impact the resulting intensity data
corresponding to an emission passing through the radiopaque
volume.
[0095] FIG. 10B illustrates a schematic diagram of the various
modules 400-450. In particular, FIG. 10B illustrates the
relationship between the visual module 400, the analysis module
425, and the notification module 450. In various embodiments, the
various modules 400-450 may facilitate implementation of various
steps illustrated in FIG. 10A and described herein.
[0096] In various embodiments, the visual module 400 of the central
server 200 may comprise a visual conversion tool 402 configured to
convert the intensity data 401 received for each X-ray image into
visible data 403 for each X-ray image comprising visible signals to
be displayed via a display device at block 1007 of FIG. 10A.
However, as will be understood by one skilled in the art, any of a
variety of computing devices may be configured to convert the
intensity data into visible signals. The resulting visible signals
are displayed via a display device at block 1008.
[0097] As illustrated in FIG. 10B, the visual module 400 may
transmit the visible data 403 to the analysis module 425 for
additional processing. The analysis module 425 may be configured to
identify the presence of ghost radiation signals in the visible
data 403 for each X-ray image. As a non-limiting example, the
analysis module 425 may comprise a ghost analysis tool 426
configured to generate ghost presence data 427 indicative of the
presence of ghost signals in the X-ray image.
[0098] Because the grid members 152, 153 are not parallel to the
direction of travel, no ghosted images may be present in the
intensity data. However, where at least one grid member is oriented
such that at least one edge of the radiopaque grid member is
substantially parallel to the direction of travel, ghosted images
may appear in the visible data 403. Therefore, the orientation of
the grid members 152, 153 relative to the direction of travel may
facilitate the identification of radiopaque objects within scanned
items 10. As a non-limiting example, the analysis module 425 may be
configured to identify radiopaque objects within an X-ray image
based upon the presence of ghost grid lines appearing over a
portion of the X-ray image. In various embodiments, upon a
determination that ghost signals are present within the X-ray
image, the analysis module 425 may be configured to transmit the
ghost presence data to the notification module 450. The
notification module 450 may comprise a notification generation tool
451 configured to generate and transmit one or more notifications
452 to relevant personnel indicative of the existence of ghost
presence data 427 in an X-ray image. As a non-limiting example, the
notification module 450 may be configured to illuminate an
indicator light located proximate to a visual display configured to
displaying the X-ray image data, or to display a notification
message on the visual display. In response to receiving such
notification, personnel monitoring the X-ray scanner device 140 may
perform additional secondary screening on the item 10 in question.
For example, such secondary screening may comprise reorienting the
item 10 for an additional scan utilizing the X-ray scanner device
140, unpacking the item for a hand search of the contents of the
item, and/or the like.
CONCLUSION
[0099] Many modifications and other embodiments of the inventions
set forth herein will come to mind to one skilled in the art to
which these inventions pertain having the benefit of the teachings
presented in the foregoing descriptions and the associated
drawings. Therefore, it is to be understood that the inventions are
not to be limited to the specific embodiments disclosed and that
modifications and other embodiments are intended to be included
within the scope of the appended claims. Although specific terms
are employed herein, they are used in a generic and descriptive
sense only and not for purposes of limitation.
* * * * *