U.S. patent application number 16/845817 was filed with the patent office on 2020-07-30 for radiation therapeutic head, collimator assembly, and control method of radiotherapeutic equipment.
The applicant listed for this patent is OUR NEW MEDICAL TECHNOLOGIES. Invention is credited to Haifeng LIU, Shiqun XIAO.
Application Number | 20200238106 16/845817 |
Document ID | 20200238106 / US20200238106 |
Family ID | 1000004752327 |
Filed Date | 2020-07-30 |
Patent Application | download [pdf] |
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United States Patent
Application |
20200238106 |
Kind Code |
A1 |
XIAO; Shiqun ; et
al. |
July 30, 2020 |
RADIATION THERAPEUTIC HEAD, COLLIMATOR ASSEMBLY, AND CONTROL METHOD
OF RADIOTHERAPEUTIC EQUIPMENT
Abstract
A radiation therapeutic head, a collimator assembly, and a
control method of a radiotherapeutic equipment are provided. The
therapeutic head includes: a source carrier; first radiation
sources for focusing therapy and a second radiation source for
conformal therapy that are disposed on the source carrier; a switch
body located on an emitting side of the first and second radiation
sources and provided with through holes therein, the switch body
being configured to control alignment of the through holes with the
first and second radiation sources to allow the emission of rays
from the first and second radiation sources; and a collimator
assembly, the collimator assembly further includes a carrier; a
focusing collimator and a multi-leaf collimator disposed on the
source carrier.
Inventors: |
XIAO; Shiqun; (Shenzhen,
CN) ; LIU; Haifeng; (Shenzhen, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
OUR NEW MEDICAL TECHNOLOGIES |
Shenzhen |
|
CN |
|
|
Family ID: |
1000004752327 |
Appl. No.: |
16/845817 |
Filed: |
April 10, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15358140 |
Nov 22, 2016 |
10653896 |
|
|
PCT/CN2014/078091 |
May 22, 2014 |
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16845817 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G21K 5/04 20130101; A61N
5/1084 20130101; A61N 2005/1094 20130101; G21K 1/046 20130101; G21K
1/025 20130101; A61N 5/1081 20130101 |
International
Class: |
A61N 5/10 20060101
A61N005/10; G21K 1/04 20060101 G21K001/04; G21K 1/02 20060101
G21K001/02; G21K 5/04 20060101 G21K005/04 |
Claims
1. A radiation therapeutic head for multi-source focusing therapy
and conformal intensity-modulated therapy, the therapeutic head
comprising: a source carrier; first radiation sources focusing
therapy and a second radiation source for conformal therapy that
are disposed on the source carrier; a switch body located on an
emitting side of the first and second radiation sources and
provided with through holes therein, the switch body being
configured to control alignment of the through holes with the first
and second radiation sources to allow the emission of rays from the
first and second radiation sources; and a collimator assembly, the
collimator assembly further comprising: a carrier; and a focusing
collimator and a multi-leaf collimator disposed on the carrier.
2. The therapeutic head according to claim 1, wherein the first
radiation sources for focusing therapy are disposed on two opposite
sides of the source carrier, and the second radiation source for
conformal therapy is disposed in a middle of the source
carrier.
3. The therapeutic head according to claim 1, wherein the
therapeutic head is configured to be rotatable about an axis, and
the first radiation sources for focusing therapy are distributed in
a sector region with an angle range of 26.degree. to 60.degree. on
a radial cross section of the axis.
4. The therapeutic head according to claim 1, wherein the
therapeutic head is configured to be rotatable about an axis, and
the first radiation sources for focusing therapy are distributed on
both sides of the second radiation source for conformal therapy at
angles of 26.degree. to 60.degree. on an axial cross section of the
axis
5. The therapeutic head according to claim 1, wherein the through
holes comprise first through holes corresponding to the first
radiation sources for focusing therapy, and a second through hole
corresponding to the second radiation source for conformal therapy,
and the second through hole is configured to be deviated from a
symmetry line of the first through holes.
6. The therapeutic head according to claim 1, wherein the
collimator assembly is provided with: multiple groups of
collimating channels for collimating focusing rays emitted by the
first radiation sources for focusing therapy; and a hole for
mounting the multi-leaf collimator.
7. The therapeutic head according to claim 1, wherein the
therapeutic head further comprises a shielding body located outside
the source carrier for shielding the radiation rays of the first
and second radiation sources.
8. The therapeutic head according to claim 1, wherein the
therapeutic head further comprises a shielding door located on a
side of the first and second radiation sources facing away from the
source carrier for controllably shielding the rays of the first and
second radiation sources.
9. The therapeutic head according to claim 8, wherein the shielding
door has two layers, and the shielding door is configured to be
opened or closed in directions perpendicular to each other.
10. The therapeutic head according to claim 1, wherein the
therapeutic head further comprises a switch body driving member,
the switch body is movable in a radial direction relative to the
source carrier under the driving of the switch body driving member,
and/or the collimator assembly driving member is configured to
drive the focusing collimator and the multi-leaf collimator to
move.
11. A collimator assembly, comprising: a carrier; and a focusing
collimator and a multi-leaf collimator disposed on the carrier.
12. The collimator assembly according to claim 11, wherein the
collimator assembly is provided with: multiple groups of
collimating channels for collimating focusing rays emitted by first
radiation sources for focusing therapy; and a hole for mounting the
multi-leaf collimator.
13. The collimator assembly according to claim 11, wherein the
collimator assembly is adapted to be attached to a therapeutic head
that is rotatable about an axis, and the first radiation sources
for focusing therapy are distributed in a sector region with an
angle range of 26.degree. to 60.degree. on a radial cross section
of the axis.
14. The collimator assembly according to claim 11, wherein two rows
of the first radiation sources for focusing therapy are disposed on
two opposite sides of the source carrier.
15. The collimator assembly according to claim 11, wherein the
collimator assembly is adapted to be attached to a therapeutic head
that is rotatable about an axis, and the radiation sources for
focusing therapy are distributed on both sides of the radiation
source for conformal therapy at angles of 26.degree. to 60.degree.
on an axial cross section of the axis.
16. A control method of a radiotherapeutic equipment comprising:
acquiring a patient's therapy plan, the radiotherapeutic equipment
comprising a therapeutic head, and the therapeutic head further
comprises first radiation sources for focusing therapy and a second
radiation source for conformal therapy, and the therapy plan
comprising: performing radiotherapy with multi-source focusing or
conformal intensity modulation, or performing radiotherapy with
both multi-source focusing and conformal intensity modulation
successively; and controlling the therapeutic head according to the
therapy plan to carry out treatment of the patient.
17. The control method according to claim 16, further comprising:
when the therapy plan is to perform radiotherapy with multi-source
focusing, the radiotherapeutic equipment performs the following
operations: moving a switch body of the radiotherapeutic equipment
to a focusing source opening position; opening a shielding door of
the radiotherapy equipment; and moving a collimator of the
radiotherapeutic equipment to select appropriate collimating holes
for focusing radiotherapy.
18. The control method according to claim 16, comprising: when the
therapy plan is to perform radiotherapy with conformal intensity
modulation, the radiotherapeutic equipment performs the following
operations: moving a switch body of the radiotherapeutic equipment
to a conformable source opening position; opening a shielding door
of the radiotherapeutic equipment; and driving a multi-leaf
collimator of the radiotherapeutic equipment, and forming a
corresponding radiation field according to the plan to perform
conformal therapy of tumors.
19. The control method according to claim 16, comprising: when the
therapy plan is to perform radiotherapy with both multi-source
focusing and conformal intensity modulation successively, the
radiotherapeutic equipment performs the following operations:
moving a switch body of the radiotherapeutic equipment to a
focusing source opening position; opening a shielding door of the
radiotherapeutic equipment; moving a collimator of the
radiotherapeutic equipment to select appropriate collimating holes
for focusing radiotherapy; moving the switch body to a conformable
source opening position; opening the shielding door; and
controlling a multi-leaf collimator, and forming a corresponding
radiation field according to the therapy plan to perform conformal
therapy of tumors.
20. The control method according to claim 16, comprising: when the
therapy plan is to perform radiotherapy with both multi-source
focusing and conformal intensity modulation successively, the
radiotherapeutic equipment performs the following operations:
moving a switch body of the radiotherapeutic equipment to a
conformable source opening position; opening a shielding door of
the radiotherapeutic equipment; controlling a multi-leaf collimator
of the radiotherapeutic equipment, and forming a corresponding
radiation field according to the therapy plan to perform conformal
therapy of tumors; moving the switch body to a focusing source
opening position; opening the shielding door; and moving a
collimator to select appropriate collimating holes for focusing
radiotherapy.
Description
CROSS REFERENCE
[0001] The present application is a continuation application of
U.S. patent application Ser. No. U.S. Ser. No. 15/358,140,
publication No. US 20170246480, titled RADIOTHERAPY APPARATUS
INCORPORATING MULTI-SOURCE FOCUSING THERAPY AND CONFORMAL AND
INTENSITY-MODULATED THERAPY, filed on Nov. 22, 2016, which is a
national phase application of the PCT application of
PCT/CN2014/078091, publication No. WO2015176265, titled
MULTI-SOURCE FOCUSING TREATMENT AND CONFORMAL INTENSITY MODULATED
RADIOTHERAPY EQUIPMENT AND COLLIMATOR COMBINATION THEREOF, filed on
May 22, 2014. Each of the foregoing patent applications is hereby
incorporated by reference in its entirety.
TECHNICAL FIELD
[0002] The disclosure relates to the technical field of large
medical equipment, and more particularly to a radiation therapeutic
head for multi-source focusing therapy and conformal
intensity-modulated therapy, a collimator assembly, and a control
method of a radiotherapeutic equipment.
BACKGROUND
[0003] Radiation therapy is a common treatment for treating a
tumor. Stereotaxic gamma-ray systemic therapy system (hereinafter
referred to as Gamma Knife) is a radiotherapeutic equipment, and
there are generally two kinds of radiotherapy approach in the
process of gamma-ray therapy, one for stereotactic focused
radiation therapy with multi-source and another for
intensity-modulated radiation therapy. The stereotactic
multi-source focused radiation therapy approach refers to emit
gamma radiation beams across the body of a patient and focus to one
focal point through the body, for destroying the tumor. However,
when the shape of the tumor is complicated, a conformal
radiotherapy would be needed. The so-called conformal
intensity-modulation therapy refers to employ a multi-leaf
collimator, to make a shape of a radiation field plane for
treatment similar to the shape of the tumor.
SUMMARY
[0004] An aspect of the present disclosure provides a radiation
therapeutic head for multi-source focusing therapy and conformal
intensity-modulated therapy. The therapeutic head includes: a
source carrier; first radiation sources for focusing therapy and a
second radiation source for conformal therapy that are disposed on
the source carrier; a switch body located on an emitting side of
the first and second radiation sources and provided with through
holes therein, the switch body being configured to control
alignment of the through holes with the first and second radiation
sources to allow the emission of rays from the first and second
radiation sources; and a collimator assembly, the collimator
assembly further includes a carrier; a focusing collimator and a
multi-leaf collimator disposed on the source carrier.
[0005] Another aspect of the present disclosure provides a
collimator assembly. The collimator assembly includes a carrier; a
focusing collimator and a multi-leaf collimator disposed on the
carrier.
[0006] Yet another aspect of the present disclosure provides a
control method of a radiotherapeutic equipment. The control method
includes acquiring a patient's therapy plan. The radiotherapeutic
equipment comprises a therapeutic head, and the therapeutic head
further comprises first radiation sources for focusing therapy and
a second radiation source for conformal therapy. The therapy plan
includes: performing radiotherapy with multi-source focusing or
conformal intensity modulation, or performing radiotherapy with
both multi-source focusing and conformal intensity modulation
successively. The method also including controlling the therapeutic
head according to the therapy plan to carry out treatment of the
patient.
[0007] The present disclosure provides a radiotherapy apparatus
incorporating multi-source focusing therapy and conformal
intensity-modulated therapy, to achieve a purpose of implementing
both accurate multi-source focused therapy and conformal therapy in
a single Gamma Knife device.
[0008] One embodiment of the present disclosure provides a
radiotherapy apparatus incorporating multi-source focusing therapy
and conformal intensity-modulated therapy, comprising a base, a
movable couch, a gantry, at least one therapeutic head, and a
counterweight, the movable couch and the gantry are disposed on the
base, the therapeutic head and the counterweight are oppositely
positioned on the gantry. The therapeutic head comprises: a
shielding part, configured for shielding radiation beams from at
least one radiation source; a source carrier received in the
shielding part, provided with first focusing radiation sources for
focused therapy and a second conformal radiation source for
conformal intensity-modulated radiotherapy; a switch body
positioned on an emitting side of the first focusing radiation
sources and the second conformal radiation source, and comprises at
least one through hole to be controlled aligning with the focusing
radiation sources or the conformal radiation source for passing
through the radiation beams; a shielding door positioned on one
side of the switch body away from the source carrier, configured
for controllably shielding the radiation beams of the radiation
sources; and a collimator assembly, comprising a collimator
carrier, and a plurality of focusing collimators and a multi-leaf
collimator disposed on the collimator carrier.
[0009] Preferably, at least two rows of focusing radiation sources
are arranged on opposite sides of the source carrier, and a
conformal radiation source is disposed in the middle of the source
carrier.
[0010] Preferably, each row comprises 9 focusing radiation sources
for focused therapy and is equidistantly distributed in an arc
sector with a central angle arranged between 26.degree. to
60.degree., along an radial axial cross section of the gantry.
[0011] Preferably, the two rows of focusing radiation sources are
distributed on two sides of the conformal radioactive source with
an included angle arranged between 26.degree. to 60.degree., along
an axial radial cross section of the gantry.
[0012] Preferably, the through hole comprises two rows of first
through holes provided on two lateral lines of the switch body and
corresponding to the focusing radiation sources for focused
therapy, and a second through hole arranged in the middle of the
switch body corresponding to the conformal radiation source for
conformal therapy, and the second through hole is offset from a
symmetry line of the two rows of first through holes.
[0013] Preferably, the shielding door comprises two layers which
are respectively movable in perpendicular directions to mutually be
opened or closed.
[0014] Preferably, the focusing collimator is mounted on the
collimator carrier and capable of moving together with the
collimator carrier, and comprises three groups of collimating holes
corresponding to the source carrier for directing the focusing
radiation from the focusing radiation sources, each group of
collimating holes comprises two rows of collimating holes with same
aperture diameter, and the distance between two rows of collimating
holes in each group is substantially equal, and the apertures size
of the collimating holes in different group are different.
[0015] Preferably, the focusing collimator is provided with a
square hole in the middle of two rows of collimating holes of each
group, and the multi-leaf collimator is received in the square
hole.
[0016] The present invention further provides a collimator assembly
comprising: a collimator carrier, and a plurality of focusing
collimators and at least one multi-leaf collimator disposed on the
collimator carrier. The focusing collimator is provided with a
square hole and groups of collimating holes configured for
directing the radiation emitted by corresponding radiation sources,
each group of collimating holes comprises two rows of collimating
holes in same aperture diameter, and the apertures size of the
collimating holes in different group are different, two rows of
collimating holes in each group are located on two sides of the
square hole with substantially same distance.
[0017] Preferably, the focusing collimators comprise three groups
of collimating holes.
[0018] By using the radiotherapy apparatus incorporating
multi-source focusing therapy and conformal intensity-modulated
therapy disclosed in the present invention, both accurate
multi-source focused therapy and conformal therapy can be
implemented in one radiotherapy apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a schematic view of a radiotherapy apparatus
incorporating multi-source focusing therapy and conformal intensity
modulation therapy, according to an embodiment of the present
disclosure;
[0020] FIG. 2 is a schematic cross-sectional view of a therapeutic
head of the radiotherapy apparatus of FIG. 1;
[0021] FIG. 3A is a schematic view from a top surface of a source
carrier of the therapeutic head of FIG. 2;
[0022] FIG. 3B is a cross-sectional schematic view along line 3B-3B
of the source carrier of FIG. 3A;
[0023] FIG. 3C is a cross-sectional schematic view along line 3C-3C
of the source carrier of the therapeutic head of FIG. 2;
[0024] FIGS. 4A to 4C are the views of the position relation
between the source carrier, switch body, shielding door, collimator
carrier and collimator of the therapeutic head of FIG. 2, during
two kinds of therapeutic sources being closed at the same time, and
during the conformal source and the focused source being opened;
and
[0025] FIG. 5 is a schematic view of the collimator carrier of the
therapeutic head of FIG. 2 with a focusing collimator and
multi-leaf collimator disposed thereon.
DETAILED DESCRIPTION
[0026] For making the purpose, the technical proposal and
advantages of embodiments of the disclosure more clear, the
technical proposal of the embodiments of this disclosure may be
described clearly and fully using the figures included. Clearly,
the described embodiments are only parts of the embodiments of this
disclosure and not all of the embodiments. Based on the embodiments
of this disclosure, all other embodiments obtained without
contributing any creative effect by those skilled in the art are
within the scope of protection of this disclosure.
[0027] In order to better understand the technical solution of the
present invention, the Applicant has explained the radiation
therapy system of the embodiment of the present invention by way of
the specific embodiment of FIG. 1. FIG. 1 is a schematic view of a
radiotherapy apparatus incorporating multi-source focusing therapy
and conformal intensity modulation therapy, according to an
embodiment of the present invention. As shown in FIG. 1, the
radiotherapy apparatus includes a base, a gantry, a therapeutic
head, a counterweight, and a movable couch. The base supports the
whole radiotherapy apparatus, and plays a role of carrying the
whole radiotherapy apparatus and a role of fixation. The gantry is
arranged on the base, and is connected to the base by a rolling
support. The gantry rotates around an axial line by means of, e.g.
gear driving, to achieve purpose of rotational treatment. The
therapeutic head is the core component of the whole device, and is
connected with the gantry. The therapeutic head is driven by the
gantry to rotate around the gantry axis to perform rotational
treatment. The therapeutic head may perform focused irradiation by
focusing the radiation of cobalt source, or may perform conformal
irradiation by passing radiation of a conformal cobalt source
through a multi-leaf collimator. The counterweight is mounted on
the gantry relative to the therapeutic head, for balancing the
weight of the therapeutic head, so that the gravity center of the
gantry coincides with its rotation center, to ensure the stability
of the gantry in the process of rotation. The treatment couch is
arranged on the base, and is movably connected to the base, e.g. by
screws and/or pins. The treatment couch is used to support and
position a patient, and can accurately deliver the patient to a
specified position for treatment.
[0028] In combination of FIGS. 2 to 3B, the therapeutic head which
is the core component of the overall device, comprises a shielding
part, a source carrier, a switch body, a shielding door, a
collimator carrier, a focusing collimator, a multi-leaf collimator,
and associated driving or motivation support members which are not
shown FIG. 2. The driving or motivation support members
(hereinafter referred to as driving members) are conventional
technology skilled in the art and will not be described in this
embodiment as long as it can realize the functions mentioned
below.
[0029] The shielding part is configured to isolate the radioactive
sources from the external environment, to shield the radiation of
the radiation sources. The source carrier is located in the
shielding part, and two rows of radiation sources in total of 18
(for each row of 9) are arranged on the opposite sides of the
source carrier for focusing therapy. The middle of the source
carrier is also provided with a radiation source for conformal
therapy (hereafter referred to as conformal source), as shown in
FIG. 3A. The conformal source is centered in the source carrier and
the two rows of focusing sources have an included angle of
26.degree. to 60.degree. in the axial cross section (i.e., the
plane parallel to the Z-Y plane in FIG. 2), preferably, the
focusing sources are distributed on both sides with included angle
of 48.degree., as shown in FIG. 3B. The source carrier are
equidistantly distributed in an arc-shaped area from angle
26.degree. to 60.degree. in a radial cross section (i.e., a plane
parallel to the Z-X plane in F FIG. 2, and X in F FIG. 2 is not
shown, but it should be known that X is perpendicular to the Y-Z
plane), as shown in FIG. 3C.
[0030] In combination of FIG. 2 and FIGS. 4A to 4B, the switch body
is located on the side of the source carrier facing away from the
shielding part, that is, under the source body, and the radiation
emitted from the two radiation sources is emitted from the same
side. The switch body can move along the radial direction (i.e., in
the Y-direction in FIG. 2) with respect to the source carrier
driven by the driving members. Two sides of the switch body are
provided with two rows of first through-holes A corresponding to
the radiation sources for focusing therapy and a second
through-hole B corresponding to the radiation source for conformal
therapy, and the second through-hole B is offset from the
symmetrical line (not shown) of the two rows of first through-holes
A. As such, the switch body is driven to three different positions
corresponding to situations of simultaneously closing the two kinds
of sources (FIG. 4A), opening the conformal source (FIG. 4B) and
opening the focusing source (FIG. 4C).
[0031] In combination of FIG. 2, the shielding door is located on
the side of the switch body facing away from the source carrier,
configured for the purpose of controllably shielding the radiation
of the radiation sources. The shielding door includes two layers
respectively capable of being opened in radial direction and axial
direction (i.e. the directions parallel to the direction of X and Y
coordinates), thus the radiation can be completely shielded while
the device is not on work. FIG. 2 only shows a second shielding
door in a closed situation which is away from the switch body.
Since the arrangement and the movement direction of a first
shielding door closer to the switch body are perpendicular to that
of the second shielding door, the state of the first shielding door
is not shown in the schematic drawing, but the person skilled in
the art will understand that the movement of the first shielding
door coincides with that of the second shielding door.
[0032] Please refer to FIG. 2 and FIG. 5, the collimator carrier
can be mounted inside the shielding door or outside the shielding
door, and can rotate and move within the gantry. The collimator
carrier is used for receiving the focusing collimators and the
multi-leaf collimator so that the two kinds of collimators can be
driven as required by the driving of the driving member. Thus, the
collimator carrier, the focusing collimator and the multi-leaf
collimator constitute a collimator combination. This arrangement
can make the collimator and multi-leaf collimator placed on the
same layer, saving a lot of space, so as to effectively increase
the radial treatment space.
[0033] The focusing collimator is mounted on the collimator carrier
and can be moved and rotated together therewith. The focusing
collimator is provided with a square hole in the middle thereof.
And three groups of collimating holes corresponding to the
radiation sources are arranged along two sides of the square hole,
configured for collimating the focusing radiation. Each group of
collimating holes includes two rows of collimating holes with same
aperture diameter, and the aperture of the collimating holes in
different groups is different. The distance between the two rows of
collimating holes in each group is approximately equal. By choosing
different collimating holes with different aperture, different
sized focal points can be chosen, so that the focus is more
accurate. Of course, the focusing collimator is not limited to
three groups of collimating holes.
[0034] The multi-leaf collimator is mounted at the square hole of
the focusing collimator. Different opening size with different
shape is formed based on the movement of each blade of the
multi-leaf collimator, to achieve a perfect match between the shape
of the radiation sources and the shape of the tumor at the distance
for therapy, to further achieve the conformal irradiation. The
multi-leaf collimator would be prior art and will not be described
again in this embodiment.
[0035] In the treatment of patients, at first, image acquisition
for the patient is performed, and a treatment plan for the
patient's lesions is made by a treatment planning software. At this
time, the doctor will determine to choose which one of the focused
head and the conformal head for treatment based on the shape,
location, size of the tumor, or choose both of them to treat the
lesion with one after another. After the plan is determined, it is
sent to the control computer, and ready for treatment.
[0036] When the patient lies on the movable couch, the patient
could be positioned thereon by means of a reset device and a
fixation device. After the patient is positioned, a control machine
for treatment reads the treatment plan of the patient to select one
of the focused radiotherapy or the conformal radiotherapy. When the
plan specifies employing the focused radiotherapy, the switch body
is moved to an opening position of the focusing source, the
two-layer shielding door are opened, the collimator carrier is
moved to select the appropriate collimating hole according to the
plan, to carry on the tumor treatment. When the plan specifies
employing conformal therapy, the switch body is moved to an open
position of the conformal source, the two-layer shielding door are
opened, the multi-leaf collimator is also opened, and the radiation
field corresponding to the plan is formed according to the planned
position, to carry out tumor conformal treatment.
[0037] In the embodiment of the present invention, when the tumor
of the patient is treated, a conformal irradiation, a focused
irradiation, or a combination of the conformal irradiation and the
focused irradiation can be selected according to the shape and size
of the tumor, adapted to treat tumor in different shapes, to
achieve a more perfect therapeutic effect.
[0038] It is to be understood that the foregoing is intended only
as a specific embodiment of the disclosure and is not intended to
limit the scope of the disclosure. The scope of protection of the
present disclosure is to be understood to be within the scope of
the present disclosure as defined by the equivalents thereof or
equivalents thereof or to any other related art, either directly or
indirectly, by the use of the present specification and
drawings.
* * * * *