WO2019072069A1

WO2019072069A1 - Collimator and treatment head

Info

Publication number: WO2019072069A1
Application number: PCT/CN2018/105666
Authority: WO
Inventors: 李金升; 刘海峰
Original assignee: 深圳市奥沃医学新技术发展有限公司
Priority date: 2017-10-09
Filing date: 2018-09-14
Publication date: 2019-04-18
Also published as: CN107485801A; CN107485801A8; CN107485801B

Abstract

A collimator and a treatment head. The collimator comprises: a base (1b), the base (1b) being provided with first collimating holes (1b01); a shield (2) provided at the outlet of the first collimating holes (1b01), the shield (2) being provided with second collimating holes (201) coaxially communicating with the first collimating holes (1b01); the shield (2) being made of a shielding material for blocking a radiation beam; the base (1b) being made of a material having a density less than that of the shield (2). The collimator is configured in this way. On the one hand, the weight of the collimator is decreased, easy processing is implemented, production costs are reduced, and during rotation of a treatment rack, it is easier to maintain the balance and stability of a treatment head, and it is easier to adjust the relative position between the treatment head and a radiation source. On the other hand, the dosimetric characteristics of the radiation field of the collimator are also improved, so that the radiation field penumbra and leakage are reduced, thereby avoiding damage to normal tissues, and improving the treatment effect on a target tumor.

Description

Collimating body and treatment head

The present application claims priority to the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit.

Technical field

The present disclosure relates to the field of medical devices, and in particular to a collimating body and a treatment head.

Background technique

Multi-source focused stereotactic radiotherapy is a radiation therapy technology that integrates computer technology, stereotactic technology, electrical control technology, and surgical technique. It uses multiple collimators mounted on the treatment head to send multiple radioactive sources. The radiation beam is focused and focused on the lesion to destroy the tumor tissue. Moreover, the size of the field and the size of the focus after the radiation beam is focused can be adjusted by the collimator, and it can be seen that the collimator plays an important role in the efficient treatment of the tumor tissue. Therefore, collimation is an important component of multi-source focused stereotactic radiotherapy equipment, and it is necessary to provide a collimator.

The prior art provides a collimating body. As shown in FIG. 1, the collimating body 1a is made of a tungsten material, and is provided with a plurality of sets of collimating holes, each of which includes a plurality of rows arranged in a line shape. The collimating holes 1a01, and each of the collimating holes 1a01 penetrates the upper and lower ends of the collimating body 1a. The inner diameters of the plurality of collimating holes 1a01 in the same group are equal, and the axes of the plurality of collimating holes 1a01 in the same group are focused at a preset position below the collimating body 1a. The inner diameters of the collimating holes 1a01 of the different groups are not equal. In application, the collimator is mounted on the treatment head, the treatment head is disposed on the rotatable treatment frame, and the upper end of the collimator is arrayed with a plurality of radiation sources (the plurality of radiation sources are arranged in a line shape) The bundle outlets fit snugly. At the time of treatment, the position of the collimator 1a is adjusted such that the plurality of collimating holes 1a01 in the group of the collimating body 1a are respectively aligned with the beam exits of the plurality of radioactive sources, and the beams emitted from the plurality of radioactive sources are respectively worn. A plurality of collimating holes 1a01 are passed through and are focused at a predetermined position below the collimating body 1a to treat the tumor tissue. Also, during treatment, the treatment head rotates with the treatment frame. When the radiation dose needs to be adjusted, the position of the collimator 1a is adjusted such that the beam exits of the plurality of sources are aligned with a set of collimating holes 1a01 having a matching inner diameter to change the radiation passing through the collimating holes 1a01. The beam size, which in turn adjusts the radiation dose.

The inventors have found that the prior art has at least the following problems:

In the prior art, the material of the collimator 1a is a tungsten material, which has high density, large weight, is difficult to process, and has high production cost. Moreover, during the rotation of the treatment frame, the collimation body easily affects the balance and stability of the treatment head, and it is difficult to adjust the relative position between the collimator and the radiation source. However, if the material of the collimator 1a is changed to a lightweight material that is easy to process, the dose characteristics of the collimator field are lowered, and the field penumbra and the leakage are increased.

Summary of the invention

The technical problem to be solved by the embodiments of the present disclosure is to provide an easy processing, low production cost, and light weight, and it is easier to maintain the balance and stability of the treatment head during the rotation of the treatment frame, and it is easier to adjust the radiation and the radiation. The relative position between the sources, without reducing the dose characteristics of the collimator field, and the collimator and treatment head that do not increase the penumbra and leakage. The specific technical solutions are as follows:

In a first aspect, an embodiment of the present disclosure provides a collimating body, including:

a base body, wherein the base body is provided with a first collimating hole;

a shielding body disposed at the outlet of the first collimating hole, wherein the shielding body is provided with a second collimating hole coaxially communicating with the first collimating hole;

The shield consists of a shielding material for blocking the radiation beam, the matrix being composed of a material having a lower density than the shielding body.

Specifically, preferably, the shielding body is located at one side of the first collimating hole outlet of the base body, and is connected to the base body.

Specifically, preferably, the shield is disposed in the first collimating hole.

Specifically, preferably, the material of the substrate is steel, aluminum, or an aluminum alloy.

Specifically, preferably, the material of the shield is tungsten, lead, or a tungsten alloy.

Specifically, preferably, the collimator further includes: a source body; the source body is embedded in a portion of the substrate on which the first collimation hole is not disposed, for blocking a radiation beam.

Specifically, preferably, the thickness of the source body is smaller than the substrate or equal to the thickness of the substrate.

Specifically, preferably, the material of the source body is tungsten, lead, or a tungsten alloy.

Specifically, preferably, the base body is provided with a plurality of first collimating hole groups different in aperture size, and each of the first collimating hole groups includes a plurality of first collimating holes having the same aperture.

In a second aspect, embodiments of the present disclosure also provide a treatment head, the treatment head comprising: the collimator.

The beneficial effects brought by the technical solutions provided by the embodiments of the present disclosure are:

The collimating body provided by the embodiment of the present disclosure provides a shielding body at the outlet of the first collimating hole on the base body, and the second collimating hole coaxially communicating with the first collimating hole is disposed on the shielding body, and The shielding body is composed of a shielding material for blocking the radiation beam, and the base body is composed of a material having a density smaller than that of the shielding body, on the one hand, the weight of the collimating body is reduced, the processing is facilitated, the production cost is reduced, and the treatment frame is rotated. It is easier to maintain the balance and stability of the treatment head, and it is easier to adjust the relative position between the treatment head and the radioactive source. On the other hand, the dose characteristics of the collimated field are also improved, the field penumbra and the leakage are reduced, the damage to other normal tissues is avoided, and the therapeutic effect on the target tumor tissue is improved.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, 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 disclosure. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a top plan view of a collimator provided by the prior art;

2-1 is a cross-sectional view of the collimator when the shield body of the embodiment of the present disclosure is the first structure;

2-2 is a cross-sectional view of the collimator when the shield body of the embodiment of the present disclosure is the second structure;

3-1 is a top view of a collimating body when the source body of the disclosure is the first structure;

3-2 is a cross-sectional view of a collimator body when the thickness of the source body and the substrate are equal, according to an embodiment of the present disclosure;

3-3 is a cross-sectional view of a collimator when the thickness of the source body is smaller than the thickness of the substrate according to an embodiment of the present disclosure;

4 is a top view of the collimator when the source body of the present disclosure is the second structure provided by the embodiment of the present disclosure.

Wherein, the reference numerals respectively indicate:

1a collimation body,

1a01 Collimation hole,

1b matrix,

1b01 first collimating hole,

2 shield,

201 second collimating hole,

3 Guanyuan body,

301 sub-source body.

Detailed ways

Unless otherwise defined, all technical terms used in the embodiments of the present disclosure have the same meaning as commonly understood by those skilled in the art. Before the embodiments of the present disclosure are described in further detail, definitions are given for understanding certain terms of the embodiments of the present disclosure.

In the present disclosure, "upper" is defined as a position near the radiation source, and "lower" is defined as a position farther from the radiation source.

"Radiation dose" is understood to mean the energy deposited by the radiation beam in the field. For example, the greater the intensity of the radiation beam, the greater the radiation dose produced by the radiation beam over the same field. The smaller the intensity of the radiation beam, the smaller the radiation dose produced by the radiation beam in the same field.

The embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

In a first aspect, an embodiment of the present disclosure provides a collimating body, as shown in FIG. 2-1 and FIG. 2-2, the collimating body includes: a base body 1b, and the base body 1b is provided with a first collimating hole 1b01; a shield 2 disposed at an exit of the first collimating hole 1b01, and the shield 2 is provided with a second collimating hole 201 coaxially communicating with the first collimating hole 1b01. The shield 2 is composed of a shielding material for blocking the radiation beam, and the substrate 1b is composed of a material having a density smaller than that of the shield 2.

It should be noted that the material of the shielding body 2 is better than the material of the base body 1b to shield the radiation beam, and can be sufficient to block the radiation beam, and the density of the material of the substrate 1b is smaller than the density of the material of the shielding body 2.

The material of the base 1b may be a metal material such as steel, aluminum, or aluminum alloy, or other composite material. As an alternative, the material of the base 1b is steel, aluminum, or aluminum alloy on the premise that the material cost is low and the processing is easy.

The shielding body 2 has good shielding ability for the radiation beam, and the material thereof can be, for example, tungsten, lead, tungsten alloy, composite shielding material containing tungsten or lead, and the like. As an alternative, the material of the shield 2 is tungsten, lead, or a tungsten alloy under the premise that the shielding radiation beam is good.

The collimator provided by the embodiment of the present disclosure is provided with the shielding body 2 at the outlet of the first collimating hole 1b01 on the base body 1b, and the second body of the shielding body 2 is coaxially connected with the first collimating hole 1b01. The straight hole 201, and the shielding body 2 is composed of a shielding material for blocking the radiation beam, and the base body 1b is composed of a material having a density smaller than that of the shielding body 2, on the one hand, the weight of the collimating body is reduced, the processing is facilitated, and the production cost is reduced. In addition, during the rotation of the treatment frame, the balance and stability of the treatment head are avoided, and the relative position with the radiation source is conveniently adjusted. On the other hand, the shielding ability of the radiation beam emitted by the second collimating hole 201 is enhanced, the dose characteristics of the collimating body are improved, the field penumbra and the leakage are reduced, and other normal tissues are prevented from being damaged. Improved treatment of target tumor tissue.

The shield 2 may be located on the outlet side of the first collimating hole 1b01 of the base 1b and connected to the base 1b.

The base body 1b can be configured in various structures. For example, the base body 1b can have a square block structure, an arcuate body or a columnar structure, or other structures. The embodiment of the present disclosure does not specifically limit the structure of the base body 1b, and can be adapted to the treatment head. Match it.

The shielding body 2 can be configured in various structures. For example, the shielding body 2 can be a block body, an arc body, a cylindrical structure, or other structures. The structure of the present disclosure does not specifically limit the structure of the shielding body 2, and can be combined with the base body. 1b can be adapted.

As a first example, as shown in FIG. 2-1, when the base 1b has a square block structure, the shield 2 has a square block structure, which is located on the exit side of the first collimating hole 1b01 of the base 1b, and The base body 1b is connected, that is, the shield body 2 is located below the base body 1b, and its upper end surface is connected to the lower end surface of the base body 1b.

For example, when the base body 1b is an arcuate body structure, the shield body 2 is an arcuate body structure, which is located on the outlet side of the first collimating hole 1b01 of the base body 1b, and is connected to the base body 1b, that is, the shield body 2 is located at the base body. The inner side of 1b is connected to the inner surface of the base 1b.

For example, when the base body 1b is a columnar structure, the shield body 2 is a cylindrical structure, which is located on the outlet side of the first collimating hole 1b01 of the base body 1b, and is connected to the base body 1b, that is, the shield body 2 is located outside the base body 1b. The inner surface thereof is connected to the outer surface of the base 1b.

In application, the radiation beam sequentially passes through the first collimating hole 1b01 on the base 1b and the second collimating hole 201 on the shield 2, so that the radiation beam exiting the second collimating hole 201 is in focus. At the site, the field is reduced, avoiding damage to other normal tissues, and optimizing the dose distribution characteristics of the source, improving the treatment effect on the tumor.

The connection between the base body 1b and the shielding body 2 is various. For example, the two can be connected by means of embedding, snapping or mechanical connection, or the alignment provided by the embodiment of the present disclosure can be obtained by integral molding. body.

When the base body 1b is engaged with the shield body 2, a plurality of snap grooves are provided on the surface of the base body 1b connected to the shield body 2, and a plurality of snap faces are provided on the face of the shield body 2 connected to the base body 1b on the end face. The slot-fitted card body is engaged with the card slot by the card body to achieve the engagement between the base body 1b and the shield body 2. The card body can be arranged as an arc body, a square body, or other irregular structure, and the snap groove is a structure suitable for the card body.

In order to avoid leakage of the radiation beam between the substrate 1b and the shield 2, as an alternative, the base 1b and the shield 2 are integrally formed.

The shield 2 may also be disposed in the first collimating hole 1b01.

As a second example, as shown in FIG. 2-2, the shield 2 is an annular body disposed in the first collimating hole 1b01.

That is, the shielding body 2 is a plurality of independent annular bodies respectively disposed at the outlets of each of the first collimating holes 1b01, and the through holes (ie, the second collimating holes 201) on each of the annular shielding bodies 2 are The corresponding first collimating holes 1b01 are coaxially connected. By providing the shield 2 in this way, the material used for the shield 2 can be saved, and the weight of the collimator provided by the embodiment of the present disclosure can be alleviated.

In application, the radiation beam sequentially passes through the first collimating hole 1b01 on the base 1b, and the second collimating hole 201 disposed on the shield 2 at the outlet of the first collimating hole 1b01, so that The radiation beam that is passed through the collimating hole 201 is reduced in the radiation field at the focus to avoid damage to other normal tissues, and the dose distribution characteristics of the radiation source are optimized, and the therapeutic effect on the tumor is improved.

In this example, the outlet of the second collimating hole 201 may be flush with the outlet of the first collimating hole 1b01 (see FIG. 2-2), that is, the lower end of the shield 2 is flush with the lower end of the base 1b.

In this example, the outer contour of the shield 2 may be configured in various structures, and the second collimating hole 201 on the shield 2 may be coaxially connected to the first collimating hole 1b01. For example, the outer contour of the shielding body 2 may be a square body, a cylinder body, a hexagonal cylinder body, etc., and the side wall of the shielding body 2 is seamlessly connected with the inner wall of the first collimating hole 1b01, or an interference fit is can. In this example, the shield 2 is an annular body, and the outer contour of the shield 2 is not particularly limited.

The shielding body 2 can be disposed in the first collimating hole 1b01 in various ways. For example, the shielding body 2 is integrally formed with the base body 1b, or the shielding body 2 is embedded in the wall of the first collimating hole 1b01, or with the first The inner wall of the collimating hole 1b01 is engaged.

In the case of using the collimator provided by the embodiment of the present disclosure, for example, the tumor tissue is treated on the treatment head, and the plurality of radiation beams emitted from the plurality of radiation sources on the treatment head respectively pass through the base 1b. After the plurality of first collimating holes 1b01 and the plurality of second collimating holes 201 on the shield 2, focus on the target tumor tissue to treat the tumor tissue. The radiation beam is shielded when the treatment is stopped.

When the treatment is stopped, the portion of the substrate 1b where the first collimation hole 1b01 is not provided may be aligned with a plurality of radiation sources to shield the plurality of radiation beams.

In order to enhance the shielding effect of the portion of the substrate 1b on which the first collimating hole 1b01 is not disposed, the collimating body provided by the embodiment of the present disclosure further includes: the source body 3; The source body 3 is embedded in a portion of the substrate 1b where the first alignment hole 1b01 is not provided for blocking the radiation beam.

It should be noted that the base 1b includes a portion where the first collimating hole 1b01 is provided and a portion where the first collimating hole 1b01 is not provided. Taking the upper end surface of the base body 1b (ie, the end near the radiation source) as an example, the source body 3 can be embedded in the base body 1b from the portion of the upper surface of the base body 1b where the first alignment hole 1b01 is not provided, and it is necessary to ensure that the source body 3 is not Affects the use of the first collimating hole 1b01.

When the treatment is stopped, the position of the substrate 1b is adjusted so that the plurality of sources are aligned with the source body 3 to shield the radiation beam.

The source body 3 can be set to a variety of structures, and the following two examples are given on the premise that it is easy to set and facilitate shielding of rays:

As a first example, as shown in Fig. 3-1, the source body 3 is a block body, and the base body 1b is embedded by the middle portion of the upper end surface of the base body 1b. At this time, the first collimating holes 1b01 are located at both side portions of the base 1b.

When the treatment is stopped, the substrate 1b is moved to align the source body 3 with the beam exits of the plurality of radiation sources, thereby shielding the radiation.

The above-mentioned source body 3 is a whole and is easy to set. When the position of the collimator is adjusted, the source body 3 can be quickly aligned with the beam exits of the plurality of sources, thereby blocking the radiation beam.

In this example, the source body 3 may be provided in a plurality of block shapes, for example, a square block, a trapezoidal block, a column, or the like, which satisfies a radiation beam capable of simultaneously blocking a plurality of radiation sources. The structure of the source body 3 is not specifically limited.

As a second example, as shown in FIG. 4, one or more first collimating hole groups may be disposed on the base body 1b, and each of the first collimating hole groups includes a plurality of first collimating holes 1b01. The body 3 includes: at least one set of sub-source groups; and the number and arrangement of the sub-source bodies 301 in any of the sub-source groups and the first collimation holes in any of the first collimating holes The number and arrangement of 1b01 are the same.

That is, the number of sub-source groups is at least one group, and each group of sub-source groups includes a plurality of sub-source bodies 301, and the number and arrangement of the plurality of sub-source bodies 301 in each sub-source group are the same. . The number and arrangement manner of the plurality of sub-collectors 301 in each sub-source group are the same as the number and arrangement of the plurality of first collimating holes 1b01 in any of the first collimation groups.

When the treatment is stopped, the substrate 1b is adjusted such that the beam exits of the plurality of radiation sources are respectively aligned with the plurality of sub-source bodies 301, thereby shielding the radiation beam.

The plurality of first collimating holes 1b01 in the first collimating hole group are arranged in the same manner as the plurality of radio sources, so that the radiation beam passes through the plurality of first collimating holes 1b01, and the sub-off is The arrangement manner of the plurality of sub-source bodies 301 in the source group is set to be the same as the arrangement of the plurality of first collimation holes 1b01 in any of the first collimation groups, so as to facilitate the plurality of sub-source groups. The individual source bodies 301 are aligned with the beam exits of the plurality of radiation sources to shield the radiation.

By setting the source body 3 in this way, the amount of material used for the source body 3 can be reduced, and the cost of raw materials can be reduced.

Specifically, the number of groups of the sub-source group may be more or less than the number of groups of the first collimation group, or may be equal.

When the number of groups of the sub-source group is equal to the number of groups of the first collimation group or less than the number of groups of the first collimation group, at least one group of sub-source groups may be along the first collimation group The arrangement direction is set between two adjacent first collimating hole groups. It is also possible to set each of the at least one set of sub-source groups to be disposed in any of the first collimating hole groups, and to make the plurality of sub-source bodies 301 in each group of the sub-source group and the corresponding ones The plurality of first collimating holes 1b01 in the first collimating hole group are alternately disposed.

In order to facilitate the setting, and reduce the processing steps and reduce the production cost, as an alternative manner, as shown in FIG. 4, the source body 3 includes a set of sub-source groups; and the plurality of sub-source bodies 301 and A plurality of first collimating holes 1b01 in the group are alternately arranged.

The structure of the sub-source body 301 can be set to various types, for example, a square block structure, a circular block structure, a triangular block structure, or other rules and an irregular block structure, which are not specifically limited and can be shielded. It can block the beam exit of the radioactive source.

In the above two examples, the thickness of the source body 3 may be smaller than the thickness of the substrate 1b, see Fig. 3-3, or equal to the thickness of the substrate 1b, see Fig. 3-2.

The greater the thickness of the source body 3, the better the effect of shielding the radiation beam.

The source body 3 is composed of a material sufficient to block the radiation beam, which is better for shielding the radiation beam than the substrate 1b. The source body 3 can be made of a variety of shielding materials, such as tungsten, lead, tungsten alloy, composite shielding materials containing tungsten or lead, and the like. Under the premise of good shielding radiation beam, the material of the source body 3 is tungsten, lead, or tungsten alloy.

In the embodiment of the present disclosure, a set of first collimating holes may be disposed on the base 1b, or a plurality of sets of first collimating holes may be disposed. In the treatment of different tumor tissues, in order to facilitate the adjustment of the radiation dose, in order to effectively kill the tumor cells while protecting other normal tissues, the substrate 1b is provided with a plurality of first collimating hole groups having different pore sizes, each of which is provided. The first collimating hole group includes a plurality of first collimating holes 1b01 having the same aperture.

When adjusting the radiation dose, determining a quantitative inner diameter of the first collimation hole 1b01 that is adapted to the radiation dose, and aligning a set of first collimation hole groups having a quantitative inner diameter with beam exits of the plurality of radiation sources, so that Tumor tissue is treated with a suitable radiation dose.

Specifically, each set of the first collimating hole group includes a plurality of first collimating holes 1b01, and the axes of the plurality of first collimating holes 1b01 in each group are focused at a preset position below the base 1b, so as to facilitate passing through the same group respectively. The plurality of radiation beams of the plurality of first collimating holes 1b01 are focused at a predetermined position below the substrate 1b along the axial direction.

The inner diameters of the first set of collimating holes 1b01 of different groups are different, and the first collimating holes 1b01 of different groups are selected for passing the radiation beam, and focusing, the radiation focus with different radiation doses and radiation fields can be obtained, and then Different tumor tissues are treated.

The plurality of first collimating holes 1b01 in different groups are arranged in the same manner so as to be matched with a plurality of radioactive sources, and each of the first collimating holes 1b01 is arranged in the same manner as the plurality of sources.

In a second aspect, an embodiment of the present disclosure further provides a treatment head comprising: the above-mentioned collimator.

Since the collimator mounted on the treatment head is light in weight and has excellent field dose characteristics, the field penumbra and the small leakage are small, which facilitates adjustment of the relative position of the collimator and the treatment head, and moves on the treatment head. Or when rotating, the treatment head can be balanced and stabilized.

The treatment head can be used in a variety of devices, and as an alternative, the treatment head is used in multi-source focused stereotactic radiotherapy. Among them, the treatment head is mounted on the treatment frame. The following is a detailed description of the treatment of tumor tissue with this treatment head:

When treating the tumor tissue, adjusting the relative positions of the collimator and the plurality of radioactive sources in the treatment head, so that the plurality of first collimating holes 1b01 and the beam exits of the plurality of radioactive sources in the collimating hole group of the collimating body After alignment, the plurality of beams pass through the plurality of first collimating holes 1b01 and are focused at a preset position below the collimating body to treat the target tumor tissue.

When the radiation dose is adjusted, a first set of collimation holes adapted to the radiation dose is determined, and a plurality of first collimation holes 1b01 in the first collimation hole group are aligned with beam exits of the plurality of radiation sources.

When the treatment is stopped, the source body 3 on the collimator is aligned with the beam exits of the plurality of sources to shield the radiation.

The above description is only the preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modifications, equivalents, improvements, etc., which are included in the spirit and principles of the present disclosure, should be included in the present disclosure. Within the scope of public protection.

Claims

A collimating body characterized by comprising:

a base body (1b), the base body (1b) is provided with a first collimating hole (1b01);

a shielding body (2) disposed at an exit of the first collimating hole (1b01), the shielding body (2) being provided with a second collimating coaxially communicating with the first collimating hole (1b01) Hole (201);

The shield (2) consists of a shielding material for blocking the radiation beam, the substrate (1b) consisting of a material having a lower density than the shielding body (2).
The collimator according to claim 1, characterized in that the shielding body (2) is located on the outlet side of the first collimating hole (1b01) of the base body (1b) and is connected to the base body (1b). .
The collimator according to claim 1, characterized in that the shield (2) is disposed in the first collimating hole (1b01).
The collimator according to claim 1, characterized in that the material of the base (1b) is steel, aluminum, or an aluminum alloy.
The collimator according to claim 1, characterized in that the material of the shield (2) is tungsten, lead or a tungsten alloy.
The collimator according to claim 1, wherein the collimator further comprises: a source body (3); the source body (3) is embedded in the substrate (1b) The portion of the first collimating hole (1b01) for blocking the radiation beam.
The collimator according to claim 6, characterized in that the thickness of the source body (3) is smaller than the thickness of the substrate (1b) or equal to the thickness of the substrate (1b).
The collimator according to claim 6, characterized in that the material of the source body (3) is tungsten, lead or a tungsten alloy.
The collimator according to claim 1, wherein the base body (1b) is provided with a plurality of first collimating hole groups having different aperture sizes, and each of the first collimating hole groups includes a plurality of apertures having the same aperture. The first collimating hole (1b01).
A treatment head, comprising: the collimator of any one of claims 1-9.