WO2019174461A1

WO2019174461A1 - Focusing head, collimator and gamma knife

Info

Publication number: WO2019174461A1
Application number: PCT/CN2019/076301
Authority: WO
Inventors: 陈方正; 杨华
Original assignee: 西安大医集团有限公司
Priority date: 2018-03-16
Filing date: 2019-02-27
Publication date: 2019-09-19

Abstract

The present invention relates to the technical field of medical devices, and a focusing head, a collimator and a gamma knife are disclosed. The focusing head includes: a source carrier and the collimator. The collimator includes a radiation shielding region and a via region, the via region includes a group of test apertures and a plurality of groups of collimation apertures, each group of collimation apertures includes a plurality of collimation apertures, and the group of test apertures includes a plurality of test apertures. The collimation apertures in the collimator comprise at least one target collimation aperture, each target collimation aperture corresponds to at least one test aperture of the group of test apertures, and the dimension and extension direction of each target collimation aperture are the same as those of the corresponding test aperture. When rays emitted from the target radiation source corresponding to the target collimation aperture pass through the corresponding test aperture, the radiation sources other than the target radiation source in the source carrier can be shielded. The focusing head not requiring adopting a tungsten shielding rod to block the collimation apertures realizes the single source test of the focusing head, and the efficiency of the single source test of the focusing head is effectively improved.

Description

Focusing head, collimator and gamma knife

This application claims that the application number submitted on March 16, 2018 is 201810220280.5, the application name is "focus head, collimator and gamma knife", and the application number submitted on March 16, 2018 is 201820361658.9, the application name The priority of the Chinese Patent Application for "Focusing Heads, Collimators, and Gamma Knives" is incorporated herein by reference.

Technical field

The present application relates to the field of medical device technology, and in particular, to a focusing head, a collimator, and a gamma knife.

Background technique

Gamma Knife is a large medical device that treats head disease. The gamma knife selectively determines the normal tissue or the diseased tissue in the skull as a target according to the principle of stereo geometric orientation, and uses a gamma ray generated by cobalt-60 to focus and illuminate the target in a large dose at a time. Produces focal necrosis or functional changes to achieve the purpose of treating the disease.

Wherein, the focusing head is one of the main components of the gamma knife, and the focusing head can generally include: a carrier body, a collimator and a plurality of collimating channels. A plurality of radioactive sources are carried on the carrier. The collimator can include a plurality of collimating aperture groups, each collimating aperture set including a plurality of collimating apertures in one-to-one correspondence with the plurality of radioactive sources. The rays emitted by each of the radiation sources sequentially pass through the corresponding collimating channels and corresponding collimating holes to form a focusing field. In the collimator, the diameters of the collimating holes in the different collimating hole groups are different, and the collimator can usually be moved, so that the rays emitted from the plurality of radioactive sources in the carrier body are emitted from the collimator. Can form different sizes of focus fields.

In the actual use of gamma knife treatment, it is also necessary to calculate the radiation dose when the radiation from one source in the focus head is emitted from the corresponding collimation hole in the different collimation hole group. This process is usually called single source test. . At present, when performing single-source testing, it is necessary to block a plurality of collimating holes on the collimator with a tungsten shielding rod, and only retain an unblocking collimating hole, so that there is only one radiation source from the focusing head. The unblocked collimation hole is ejected, and then the dose of the beam after the beam is calculated.

However, usually the number of collimating holes on the collimator is large, and the number of tungsten shielding rods is required to be large, and the process of installing the tungsten shielding rod is manually operated manually. Therefore, the single-source test of the focusing head is currently performed. The efficiency is lower.

Summary of the invention

The present application provides a focusing head, a collimator and a gamma knife, which can solve the problem of low efficiency of the existing single source test of the focusing head. The technical solution is as follows:

In one aspect, a focusing head is provided, comprising:

A carrier and a collimator;

The carrier is used to carry a plurality of radioactive sources;

The collimator includes a via area, the via area includes a test hole group and a plurality of collimation hole groups, and each of the collimation hole groups includes a plurality of standards corresponding to the plurality of radiation sources a straight hole, the test hole group includes a plurality of test holes;

The collimating hole in the collimator includes at least one mesh straight hole, each of the standard straight holes corresponding to at least one of the test hole groups, and the size of each of the standard straight holes And extending direction is the same as the size and extension direction of the corresponding test hole;

Wherein, when the radiation emitted by the target radiation source corresponding to the straight hole of the target standard passes through the corresponding test hole, the radiation source other than the target radiation source in the carrier may be shielded.

Optionally, the collimating holes in each of the collimating hole groups include at least one of the standard straight holes.

Optionally, a plurality of the straight holes of the target are in one-to-one correspondence with the plurality of test holes.

Optionally, the collimator further includes a radiation shielding area, wherein when the radiation emitted by the target radiation source corresponding to the target straight hole passes through the corresponding test hole, the target body includes the target A radiation source other than the radiation source can be shielded by the radiation shielding region.

Optionally, the plurality of test holes are distributed around the radiation shielding area.

Optionally, the plurality of collimating hole groups are distributed around the radiation shielding area, and the plurality of test holes are close to the radiation shielding area with respect to the plurality of collimating hole groups.

Optionally, the periphery of the radiation shielding region is sequentially arranged with: a test hole corresponding to a standard straight hole in the first collimating hole group, and the first collimating hole group, the first collimating The hole group is a group of collimating holes including any one of the plurality of collimating hole groups.

Optionally, the focusing head further includes: two driving components, the collimator is a plate-like structure;

Each of the drive assemblies is fixedly coupled to the collimator, one of the two drive assemblies is configured to drive the collimator to move in a first direction, and another drive assembly is configured to drive the The collimator moves in a second direction, the first direction intersecting the second direction, the first direction and the second direction being parallel to the collimator.

Optionally, each of the driving components includes: a driving motor, a screw rod and a nut, the nut is fixedly connected to the collimator, the screw rod is movably connected to the nut, and the driving motor is a first end of the lead screw is connected, and the driving motor is configured to drive the screw to rotate to move the nut along the extending direction of the lead screw;

Two of the two drive assemblies extend in a direction of the first direction and the second direction, respectively.

Optionally, the two screw rods extend perpendicular to the direction.

Optionally, the two screw rods extend in a direction parallel to two adjacent edges of the collimator.

Optionally, each of the driving components further includes: a support bearing coupled to the second end of the lead screw.

Optionally, the focusing head further includes: a plurality of collimating channels corresponding to the plurality of radio sources in one-to-one correspondence.

In another aspect, a collimator is provided, comprising:

a via region, the via region includes a test hole group and a plurality of collimation hole groups, each of the collimation hole groups includes a plurality of collimation holes, and the test hole group includes a plurality of test holes;

The collimating hole in the collimator includes at least one mesh straight hole, each of the standard straight holes corresponding to at least one of the test hole groups, and the size of each of the standard straight holes And the extending direction is the same as the size and the extending direction of the corresponding test hole.

Optionally, the collimator further includes a radiation shielding area, and the plurality of test holes are distributed around the radiation shielding area.

In still another aspect, a gamma knife is provided, comprising: a swinging assembly and a focusing head, the focusing head comprising the focusing head of the first aspect, the focusing head being coupled to the swinging component, the swinging component The focus head is swung to drive.

The beneficial effects brought by the technical solutions provided by the embodiments of the present application include at least:

When the focusing head needs to perform the single source test, the collimator is moved to change the relative position of the collimator and the carrier body, so that the radiation from the target source corresponding to the standard straight hole passes through the corresponding test hole. The radiation source other than the target radiation source in the carrier can be shielded, and only the radiation emitted by the target source is emitted from the test hole, and the dose of the beam after the beam can be calculated. Therefore, the focusing head does not need to use a tungsten shielding rod to block the collimating hole, and only needs to change the relative position of the collimator and the carrier body, so that the single source test of the focusing head can be realized, thereby effectively improving the single head of the focusing head. The efficiency of the source test. Further, the difficulty in manufacturing the tungsten shield bar is avoided, and the problem that the operator is easily exposed to the radiation source is also avoided.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a schematic structural view of a focusing head provided by a related art;

2 is a schematic structural view of a collimator provided by the related art;

3 is an effect diagram of the focus head shown in FIG. 1 in an off state;

4 is an effect diagram of the single-source test of the focus head shown in FIG. 1;

FIG. 5 is a schematic structural diagram of a focusing head according to an embodiment of the present application; FIG.

Figure 6 is a bottom plan view of the focus head shown in Figure 5;

7 is an effect diagram of forming a focusing field on a focal plane of a focusing head according to an embodiment of the present application;

FIG. 8 is an effect diagram of a focus head for single source testing according to an embodiment of the present application; FIG.

9 is an effect diagram of another focusing head provided by the embodiment of the present application when performing single source testing;

10 is a schematic structural diagram of a collimator according to an embodiment of the present application;

11 is a schematic structural diagram of another collimator according to an embodiment of the present application;

FIG. 12 is a bottom view of another focusing head according to an embodiment of the present application;

FIG. 13 is a schematic structural diagram of still another focusing head according to an embodiment of the present application; FIG.

14 is a schematic structural diagram of a gamma knife according to an embodiment of the present application;

15 is an effect diagram of still another focusing head for performing single source testing according to an embodiment of the present application;

FIG. 16 is an effect diagram of a focus head carrying a single source test according to an embodiment of the present application.

detailed description

In order to make the objects, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a focusing head provided by the related art. The focusing head may include a carrier body 01, a collimator 02, and a plurality of collimating channels 03. The carrier body 01 carries a plurality of radiation sources 011 that are in one-to-one correspondence with the plurality of collimation channels 03. The collimator 02 can include a plurality of collimating aperture groups, each of which includes a plurality of collimating apertures 021 that are in one-to-one correspondence with the plurality of radiation sources 011. The collimating channel 03 is a channel provided in the shielding layer for shielding the radiation source in the focusing head.

Please refer to FIG. 2. FIG. 2 is a schematic structural diagram of a collimator 02 provided by the related art. The collimator 02 may include: 7 collimating hole groups, for example, the collimating hole groups 02a, the collimating hole group 02b, the collimating hole group 02c, and the collimating hole group 02d. , collimation hole group 02e, collimation hole group 02f, and collimation hole group 02g. The number of the collimating holes 021 in each collimating hole group is the same, and the diameters of the collimating holes 021 in the different collimating hole groups are different, for example, the diameters of the collimating holes 021a and the collimating holes 021b belonging to different collimating hole groups. different.

The radiation emitted by each of the radiation sources 011 in the source body 01 can sequentially pass through the corresponding collimation channels 03 and the corresponding collimation holes 021 to form a focus field. The collimator 02 can be moved such that the plurality of collimating holes 021 in the different collimating hole groups on the collimator 02 are in one-to-one correspondence with the plurality of collimating channels 03. At this time, the plurality of radioactive sources 011 emit The rays pass through the collimator 02 to form different sizes of focus fields.

The focusing head in the related art needs to leave the source body in an off state before performing single source testing. For example, please refer to FIG. 3. FIG. 3 is an effect diagram of the focus head shown in FIG. 1 in an off state. The carrier body 01 is a roller structure and is rotatable about a rotation axis L. When the carrier body 01 needs to be in an off-source state, the carrier body 01 is rotated by 180° around the rotation axis L, so that a plurality of the carrier body 01 are The radiation from the source 011 cannot pass through the collimation channel 03. After the source body 01 is in the off state, the tungsten shield bar 04 is used to block the collimation hole 021, and an unblocked collimation hole 021c is left, and the carrier body 01 is left open source.

At this time, please refer to FIG. 4. FIG. 4 is an effect diagram of the single-source test of the focus head shown in FIG. 1. After the source body 01 is in an open source, only one of the plurality of sources 011 in the source 01 can emit rays from the unblocked collimation hole 021c, and the beam can be calculated. Ray dose.

However, usually the number of collimating holes on the collimator is large, and the number of tungsten shielding rods is required. The process of installing the tungsten shielding rod is manually operated manually. Therefore, the single-source test of the focusing head is currently performed. Less efficient. Moreover, the source body should be in the off state before the single source test, which further reduces the efficiency of the single source test.

On the other hand, when shielding with a shielding rod, it is difficult to completely shield the radiation, and the tester is still exposed to excessive low doses. And if the shielding rod is dropped due to the fixing of the shielding rod, the radiation dose is very high, and it is difficult to ensure the safety of the tester.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a focusing head according to an embodiment of the present application. The focusing head may include:

The carrier body 10 and the collimator 20.

The carrier body 10 is used to carry a plurality of radiation sources 11.

In order to clearly see the structure of the collimator 20, please refer to FIG. 6. FIG. 6 is a bottom view of the focusing head shown in FIG. 5. The collimator 20 includes a radiation shielding region 21 and a via region 22, and the via region 22 includes a test hole group 22a and a plurality of collimation hole groups 22b. Each of the collimating hole groups 22b does not overlap with the test hole group 22a. Each of the collimating hole groups 22b includes a plurality of collimating holes 221 corresponding to the plurality of radiation sources 11 in one-to-one. The test hole group 22a includes a plurality of tests. Hole 222. In the embodiment of the present application, the radiation emitted by the plurality of radiation sources 11 carried on the carrier body 10 is beamed out through the corresponding collimation holes 221 in any of the collimating hole groups 22b to form a focusing field.

The collimating holes in the collimator 20 include at least one mesh straight hole 221a, and each mesh straight hole 221a corresponds to at least one of the test hole groups 22a. For example, the standard straight hole a1 may correspond to the test hole b1 in the test hole group 22a, and the standard straight hole a1 may also correspond to the test hole b2 in the test hole group 22a. Each of the standard straight holes 221a has the same size as the corresponding test hole 222, and the extending direction of each of the standard straight holes 221a (ie, the direction of the center line of the straight hole 221a of the mesh) and the extending direction of the corresponding test hole 222 (ie, the direction in which the center line of the test hole 222 is located) is the same.

In the embodiment of the present application, each of the plurality of collimating holes 221 in each of the collimating hole groups 22b is a tapered hole, and each of the collimating holes 221 has different sizes. Generally, the same collimating hole group is used. The difference in size between any two collimating holes 221 in 22b is within 0.05 mm, that is, the difference in diameter of the radiation entrances in any two collimating holes 221 is within 0.05 mm, and the rays in any two collimating holes 221 The diameter difference of the outlet is within 0.05 mm; each of the standard straight holes 221a is the same size as the corresponding test hole 222, that is, the diameter of the radiation inlet in each of the standard straight holes 221a and the corresponding test hole 222. The diameters of the ray inlets are the same, and the diameter of the ray outlet in each of the standard straight holes 221a is the same as the diameter of the ray outlet of the corresponding test hole 222.

Wherein, when the radiation from the target radiation source corresponding to the target straight hole 221a passes through the corresponding test hole 222, the radiation source other than the target radiation source in the carrier body 10 can be shielded. In the embodiment of the present application, when the radiation from the target radiation source corresponding to the target straight hole 221a passes through the corresponding test hole 222, the radiation source other than the target radiation source in the carrier 10 can be irradiated by the radiation shielding region. 21 shielded.

For example, when it is necessary to perform treatment by the focusing head, as shown in FIG. 5, the collimator 20 is moved to change the relative position of the collimator 20 and the carrier body 10 so that the radiation emitted by each of the radiation sources 11 can pass. The corresponding collimating holes 221 in a collimating hole group 22b are bundled so that a focusing field can be formed on the focal plane.

For example, please refer to FIG. 7. FIG. 7 is a schematic diagram of a focusing head forming a focusing field on a focal plane according to an embodiment of the present application. The focal plane S is an isocenter focal point O and perpendicular to the gravity direction of the focusing head. In the plane in which the center line is focused, O is the point at which the rays emitted by the plurality of sources in the source body converge, and the distances from the center points O to each of the sources are substantially the same. When the radiation from the plurality of radiation sources in the carrier body passes through a group of collimating holes, the distances from the exit faces of the plurality of collimating holes in the collimating hole group to the isocenter focal point O are approximately the same. The plurality of sources may form a focus field A on the focal plane S after the collimation hole group, and the isocenter focus O is also the center of the focus field A.

It should be noted that FIG. 5 is only a schematic diagram of a plurality of radiation sources 11 . In an optional implementation manner, in order to ensure that the focus is 0 to the distance of each of the radiation sources is substantially the same, the plurality of radiation sources 11 needs to be arranged on the preset spherical arc surface, and the center of the preset spherical arc surface is the equal center line focus O.

For example, when the focus head requires a single source test, please refer to FIG. 8 and FIG. 9. FIG. 8 is an effect diagram of a focus head for performing single source test according to an embodiment of the present application, and FIG. 9 is provided by the embodiment of the present application. Another focus head is used to perform the single source test, and the collimator 20 is moved to change the relative position of the collimator 20 and the carrier body 10 so that the target source 11a corresponding to the standard straight hole 221a is emitted. The rays pass through corresponding test holes 222. At this time, the radiation source other than the target radiation source 11a in the carrier body 10 is shielded by the radiation shielding region 21, and only the radiation emitted from the target radiation source 11a in the carrier body 10 is emitted from the test hole 222, and further The dose of the beam after the beam can be calculated to complete the single source test of the focus head.

In the related art, in order to effectively block the collimating hole of the tungsten shielding rod, it is necessary to ensure the precision of the tungsten shielding rod, and the diameter of the collimating hole in the plurality of collimating hole groups in the collimator is different. Therefore, tungsten shielding rods also need different sizes, which makes it difficult to manufacture tungsten shielding rods. Moreover, when the focus head of the related art performs the single source test, the tungsten shield bar is manually installed by hand, and the operator is easily exposed to the radiation of the radiation source.

In the embodiment of the present application, the single source test of the focusing head can be realized without using a tungsten shielding rod to block the collimating hole, thereby avoiding the problem of manufacturing the tungsten shielding rod and avoiding the operation. Personnel are susceptible to radiation from radioactive sources.

In summary, the focus head provided by the embodiment of the present application includes: a source body and a focusing head, the focusing head radiating a shielding area and a via area, the through hole area includes a plurality of collimating holes and a plurality of testing holes, The collimating hole in the collimator includes at least one standard straight hole, and each standard straight hole corresponds to at least one test hole, and each of the standard straight holes has the same size as the corresponding test hole, and each mesh The direction in which the standard straight holes extend is parallel to the direction in which the corresponding test holes extend. When the focusing head needs to perform the single source test, the collimator is moved to change the relative position of the collimator and the carrier body, so that the radiation from the target source corresponding to the standard straight hole passes through the corresponding test hole. The radiation source other than the target radiation source in the carrier can be shielded, and only the radiation emitted by the target source is emitted from the test hole, and the dose of the beam after the beam can be calculated. Therefore, the focusing head does not need to use a tungsten shielding rod to block the collimating hole, and only needs to change the relative position of the collimator and the carrier body, so that the single source test of the focusing head can be realized, thereby effectively improving the single head of the focusing head. The efficiency of the source test. Further, the difficulty in manufacturing the tungsten shield bar is avoided, and the problem that the operator is easily exposed to the radiation source is also avoided.

In the embodiment of the present application, when the rays emitted by the plurality of radioactive sources carried on the carrier body respectively pass through the plurality of collimating hole groups, the size of the focusing field formed on the focal plane is different, in order to obtain different sizes of the focused field radiation doses. A single source test is required for each collimated hole set. Please refer to FIG. 10. FIG. 10 is a schematic structural diagram of a collimator 20 according to an embodiment of the present application. The collimating holes in each collimating hole group 22b include at least one collimating straight hole 221a, for each standard. The straight holes 221a correspond to at least one test hole 222, and the size of each of the standard straight holes 221a is the same as the size and the extending direction of the corresponding test holes 222, so that the relative position of the collimator 20 and the carrier body 10 can be changed. The location allows for single source testing of different collimation hole sets.

Optionally, as shown in FIG. 10, the plurality of standard straight holes 221a are corresponding to the plurality of test holes 222, and the effective reduction is performed without affecting the single source test for different collimated hole groups. The area of the via region 22 is reduced, thereby reducing the size of the collimator 20.

In the embodiment of the present application, as shown in FIG. 10, in order to ensure that the radiation shielding region 21 can effectively shield the radiation emitted by the radiation source other than the target radiation source during the single source test, the plurality of via regions 22 Test holes 222 are distributed around the radiation shielding zone 21.

Optionally, as shown in FIG. 11 , FIG. 11 is a schematic structural diagram of another collimator provided in the embodiment of the present application. A plurality of collimating hole groups 22 b in the via area 22 are distributed around the radiation shielding area 21 . And the plurality of test holes 222 are close to the radiation shielding region 21 with respect to the plurality of collimation hole groups 22b. At this time, the area of the collimator 20 is small. Moreover, when the relative position of the collimator 20 and the carrier body 10 needs to be changed by moving the collimator 20, the range of the collimator 20 that needs to be moved is small, effectively improving the change of the collimator 20 and the load. The efficiency of the positional relationship between the source bodies 10.

In the embodiment of the present application, as shown in FIG. 11, the periphery of the radiation shielding region 21 is sequentially arranged with: a test hole 222 corresponding to the standard straight hole in the first collimating hole group, and the first collimating hole The first collimating hole group is a collimating hole group including any one of the plurality of collimating hole groups 22b. For example, the test hole b3 corresponding to the standard straight hole a2 in the collimation hole group A1, and the collimation hole group A1 are sequentially arranged at the periphery of the radiation shielding region 21. At this time, in the single source test, the test hole corresponding to the collimated hole group to be tested can be quickly found, thereby reducing the test time and improving the efficiency of the single source test.

In an optional implementation, in order to enable the radiation shielding zone 21 to effectively shield the rays emitted by the unrelated sources during the single source test, the standard straight holes in each of the collimating hole groups 21b are usually The collimating holes 221 are a collimating hole that is farther from the radiation shielding region 21. For example, in the collimation hole group A2, the standard straight hole is the collimation hole a3; in the collimation hole group A3, the standard straight hole is the collimation hole a4.

Optionally, in order to facilitate the movement of the collimator to change the relative position of the collimator and the carrier, as shown in FIG. 12, FIG. 12 is a bottom view of another focusing head provided by the embodiment of the present application, the focusing head It may also include two drive assemblies 30, each of which is fixedly coupled to the collimator 20. One of the two drive assemblies 30 is used to drive the collimator 20 to move in the first direction x, and the other drive assembly is used to drive the collimator 20 to move in the second direction y, the first direction x and the first The two directions y intersect. The collimator 20 may be a plate-like structure, and the first direction x and the second direction y are both parallel to the collimator 20, for example, the first direction x and the second direction y are both disposed parallel to the collimator 20. The plane of the collimation hole 221.

By way of example, as shown in FIG. 12, each drive assembly 30 can include a drive motor 31, a lead screw 32, and a nut 33. The nut 33 is fixedly coupled to the collimator 20, and the lead screw 32 is movably coupled to the nut 31. The driving motor 31 is fixedly coupled to the first end of the lead screw 32. The driving motor 31 is configured to drive the screw 32 to rotate, so that the nut 31 moves along the extending direction of the screw 32, thereby driving the collimator 20 along the screw 32. The direction of extension is parallel. The two screw rods 32 of the two driving assemblies 30 extend in a first direction x and a second direction y, respectively. Optionally, each drive assembly 30 further includes: a support bearing 34 movably coupled to the second end of the lead screw 32, the support bearing 34 being operable on the lead screw 32 when the lead screw 32 is rotated The supporting action, in turn, enables the screw 32 to rotate smoothly.

In the embodiment of the present application, as shown in FIG. 12, the extending directions of the two screw rods 32 of the two driving assemblies 30 are perpendicular, that is, the first direction x is perpendicular to the second direction y. In general, the collimator 20 may have a rectangular plate-like structure, and the extending directions of the two screw rods 32 are respectively parallel to two adjacent edges in the collimator 20, that is, the first direction x may be In parallel with one of the two adjacent edges of the collimator 20, the second direction y may be parallel to the other of the two adjacent edges of the collimator 20. In the embodiment of the present application, the operation of the motor 31 in the two driving components 30 can be controlled, thereby automatically adjusting the positional relationship between the collimator 20 and the carrier body, thereby realizing the focusing head to perform different collimating hole groups. Single source testing, as well as treatment through the focus head.

Optionally, as shown in FIG. 13 , FIG. 13 is a schematic structural diagram of still another focusing head according to an embodiment of the present application. The focusing head may further include: a plurality of collimating channels 40, and the plurality of collimating channels 40 and A plurality of radiation sources 11 correspond one-to-one. The radiation emitted by each of the radiation sources 11 passes through the corresponding collimating channels 40 and the corresponding collimating holes 221 in the collimating hole group 22b in turn, and then exits the beam.

The embodiment of the present application further provides a collimator, the collimator includes: a radiation shielding area and a via area, the through hole area includes a test hole group and a plurality of collimation hole groups, and each of the collimation hole groups includes a plurality of collimating holes, the test hole group includes a plurality of test holes; the collimating holes in the collimator include at least one mesh standard straight hole, and each of the standard straight holes corresponds to at least one of the test hole groups, The size and direction of extension of each standard straight hole are the same as the corresponding test hole size and extension direction. It should be noted that the structure of the collimator can refer to the collimator shown in FIG. 10 or FIG.

Optionally, the collimating holes in each of the collimating hole groups include at least one collimating straight hole.

Optionally, the plurality of standard straight holes correspond to the plurality of test holes one by one.

Optionally, a plurality of test holes are distributed around the radiation shielding area.

Optionally, a plurality of collimating hole groups are distributed around the radiation shielding area, and the plurality of test holes are adjacent to the radiation shielding area with respect to the plurality of collimating hole groups.

Optionally, the periphery of the radiation shielding region is sequentially arranged with: a test hole corresponding to the standard straight hole in the first collimating hole group, and a first collimating hole group. The first collimating hole group is any one of a plurality of collimating hole groups.

Usually a single source test of the focus head has the following conditions:

(1) In the single source test, the geometric size of a collimating hole in the collimator is consistent with the geometrical dimension of the test hole through which the source passes;

(2) The source focal lengths of the plurality of collimating holes in each collimating hole group in the collimator are the same, that is, the distance from each radio source to the isocenter focus is uniform;

(3) The distance from the exit face of the plurality of collimation holes in each collimator group to the isocenter focus is approximately the same;

(4) In the single source test, the radiation from the source passing through the test hole is perpendicular to the focal plane.

For the above conditions (1) to (3), the focus head provided by the embodiment of the present application can satisfy the three conditions. Please refer to the foregoing description of the structure of the focus head structure, and details are not described herein again.

For the above condition (4), the embodiment of the present application further provides a gamma knife. Referring to FIG. 14, the gamma knife may include: a swinging component 100 and a focusing head 200, and the focusing head 200 may be FIG. 5 or 13 shows the focus head. The focusing head 200 is coupled to the swinging assembly 100 for driving the focusing head 100 to swing. For example, the swinging assembly 100 can drive the focusing head to swing in the direction a to achieve non-coplanar illumination.

For example, as shown in FIG. 14, the swing assembly 100 may include: a circular arc guide 101 and a gear (not shown in FIG. 14), and the circular guide rail 101 is movably connected with the focus head 200, and the circular guide rail 101 and the gamma The holder 300 of the knives is fixedly connected; the focus head 200 is further provided with a circular arc rack 201, and the gear cooperates with the circular arc rack 201, and the gear is used to drive the movement of the circular rack 201 to drive the focusing head 200 at The circular guide rail 101 is moved to realize the swinging of the focus head 200 in the direction a. Generally, the angle α of the swing is in the range of [0, 35] degrees.

In the embodiment of the present application, the focusing head 200 is disposed on a drum (not shown in FIG. 14), and the drum is movably connected to the bracket 300 of the gamma knife, by which the focusing head 200 can be controlled to rotate along the circumference of the drum axis. .

In the embodiment of the present application, by the cooperation of the swinging component and the drum, it is possible to realize that the radiation emitted from the radiation source passing through the test hole is perpendicular to the focal plane in the single source test. For example, referring to FIG. 15 and FIG. 16, the radiation from the radiation source passing through the test hole is perpendicular to the focal plane S, and then the dose of the beam after the beam can be calculated to complete the single source test of the focus head.

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application are included in the protection of the present application. Within the scope.

Claims

A focusing head, comprising:

A carrier and a collimator;

The carrier is used to carry a plurality of radioactive sources;

The collimator includes a via area, the via area includes a test hole group and a plurality of collimation hole groups, and each of the collimation hole groups includes a plurality of standards corresponding to the plurality of radiation sources a straight hole, the test hole group includes a plurality of test holes;

The collimating hole in the collimator includes at least one mesh straight hole, each of the standard straight holes corresponding to at least one of the test hole groups, and the size of each of the standard straight holes And extending direction is the same as the size and extension direction of the corresponding test hole;

Wherein, when the radiation emitted by the target radiation source corresponding to the straight hole of the target standard passes through the corresponding test hole, the radiation source other than the target radiation source in the carrier may be shielded.
The focusing head of claim 1 wherein the collimating aperture in each of said sets of collimating apertures comprises at least one of said collimating straight apertures.
The focusing head according to claim 2, wherein a plurality of said standard straight holes are in one-to-one correspondence with said plurality of test holes.
The focusing head according to claim 1, wherein the collimator further comprises a radiation shielding region, when a radiation from a target radiation source corresponding to the target straight hole passes through the corresponding test hole, A radiation source other than the target radiation source in the carrier may be shielded by the radiation shielding region.
The focusing head of claim 4 wherein said plurality of test holes are distributed around said radiation shielding zone.
The focusing head according to claim 5, wherein said plurality of collimating hole groups are distributed around said radiation shielding area, said plurality of test holes being adjacent to said plurality of collimating hole groups Radiation shielding area.
The focusing head according to claim 6, wherein the periphery of the radiation shielding region is sequentially arranged with: a test hole corresponding to a standard straight hole in the first collimating hole group, and the first standard a straight hole group, wherein the first collimating hole group is a collimating hole group including any one of the plurality of collimating hole groups.
The focusing head according to any one of claims 1 to 7, wherein the focusing head further comprises: two driving components, the collimator is a plate-like structure;

Each of the drive assemblies is fixedly coupled to the collimator, one of the two drive assemblies is configured to drive the collimator to move in a first direction, and another drive assembly is configured to drive the The collimator moves in a second direction, the first direction intersecting the second direction, the first direction and the second direction being parallel to the collimator.
A focusing head according to claim 8, wherein each of said driving assemblies comprises: a driving motor, a lead screw and a nut, said nut being fixedly coupled to said collimator, said lead screw and said nut a movable connection, the drive motor is coupled to the first end of the lead screw, and the drive motor is configured to drive the screw to rotate to move the nut along the extending direction of the lead screw;

Two of the two drive assemblies extend in a direction of the first direction and the second direction, respectively.
The focusing head according to claim 9, wherein the two screw rods extend in a direction perpendicular to each other.
The focusing head according to claim 10, wherein the two screw rods extend in a direction parallel to two adjacent edges of the collimator.
The focusing head of claim 9 wherein each of said drive assemblies further comprises: a support bearing coupled to the second end of said lead screw.
The focusing head according to any one of claims 1 to 7, wherein the focusing head further comprises: a plurality of collimating channels corresponding to the plurality of radiation sources in one-to-one correspondence.
A collimator, comprising:

a via region, the via region includes a test hole group and a plurality of collimation hole groups, each of the collimation hole groups includes a plurality of collimation holes, and the test hole group includes a plurality of test holes;

The collimating hole in the collimator includes at least one mesh straight hole, each of the standard straight holes corresponding to at least one of the test hole groups, and the size of each of the standard straight holes And the direction of extension is the same as the size and extension direction of the corresponding test hole.
The collimator of claim 14 wherein the collimating aperture in each of said sets of collimating apertures comprises at least one of said collimating straight apertures.
The collimator according to claim 15, wherein a plurality of said standard straight holes are in one-to-one correspondence with said plurality of test holes.
The collimator of claim 14 wherein said collimator further comprises a radiation shielding zone, said plurality of test apertures being distributed around said radiation shielding zone.
The collimator according to claim 17, wherein said plurality of collimating hole groups are distributed around said radiation shielding area, said plurality of test holes being adjacent to said plurality of collimating hole groups Radiation shielding area.
The collimator according to claim 18, wherein the periphery of the radiation shielding region is sequentially arranged with: a test hole corresponding to a standard straight hole in the first collimating hole group, and the first a collimating hole group, wherein the first collimating hole group is a collimating hole group including any one of the plurality of collimating hole groups.
A gamma knife, comprising: a swinging assembly and a focusing head, the focusing head comprising the focusing head according to any one of claims 1 to 13, the focusing head being coupled to the swinging component, the swinging The component is used to drive the focus head to swing.