CN107485801A8 - One kind collimation body and treatment head - Google Patents

Abstract

The invention discloses one kind collimation body and treatment head, belong to medical instruments field.The collimation body includes：Matrix, the first collimating aperture is provided with matrix；The shield in the first collimating aperture exit is arranged on, the second collimating aperture with the first collimating aperture coaxial communication is provided with shield；Shield is by for stopping that the shielding material of beam of radiation forms, the material that matrix is less than shield by density forms.The collimation body is arranged such, on the one hand makes the weight saving of the collimation body, convenient processing, reduces production cost, and then in frame rotation process is treated, it is easier to keep the balance and stability for the treatment of head, it is easier to adjust its relative position between radioactive source.On the other hand the Dose Characteristics of the collimation body launched field are further improved, launched field penumbra and leakage is penetrated reduction, avoids damage to other normal structures, improve the therapeutic effect to target tumor.

Description

A collimating body and treatment head

Technical field

[0001] The present invention relates to the field of medical devices, in particular to a collimator and a treatment head.

Background technique

[0002] Multi-source focused stereotactic radiotherapy is a radiotherapy technology that integrates computer technology, stereotactic technology, electrical control technology, and surgical technology. It uses a collimator mounted on the treatment head to combine multiple The radiation beam emitted by the radioactive source is focused and concentrated on the lesion to destroy the tumor tissue. In addition, the size of the field and the focus size of the radiation beam can be adjusted through the collimator. It can be seen that the collimator plays an important role in efficiently treating tumor tissues. Therefore, the collimator is an important component of the multi-source focusing stereotactic radiotherapy equipment, and it is very necessary to provide a collimator.

[0003] The prior art provides a collimating body, as shown in FIG. 1, the collimating body la is made of tungsten material, and a plurality of collimating hole groups are provided thereon, and each group includes a plurality of rows. The collimating holes la01 are arranged in a linear shape, and each collimating hole la01 penetrates the upper and lower ends of the collimating body la. The inner diameters of the multiple collimating holes la01 in the same group are equal, and the axes of the multiple collimating holes la01 in the same group are focused at a preset position under the collimating body la. The inner diameters of the collimating holes laOl of different groups are not equal. In application, the collimator is installed on the treatment head, the treatment head is set on the rotatable treatment gantry, and the upper end of the collimator is aligned with multiple radiation sources (multiple radiation sources are arranged in a line). The beam exit fits tightly. During treatment, adjust the position of the collimator la so that the multiple collimating holes laOl in the upper group of the collimator la are aligned with the beam exits of the multiple radiation sources, and the beams emitted by the multiple radiation sources respectively pass through Pass through a plurality of collimating holes laOl, and focus at a preset position under the collimating body la to treat the tumor tissue. And, during the treatment process, the treatment head rotates with the treatment frame. When the radiation dose needs to be adjusted, the position of the collimator la is adjusted so that the beam exits of the multiple radiation sources are aligned with a set of collimating holes laOl with a suitable inner diameter, so as to change the radiation radiation passing through the collimating holes laOl. Beam size, and then adjust the radiation dose.

[0004] The inventor found that the prior art has at least the following problems:

[0005] In the prior art, the material of the collimator la is a tungsten material, which has a high density, a large weight, is difficult to process, and has a high production cost. In addition, during the rotation of the treatment gantry, the collimator easily affects the balance and stability of the treatment head, and it is not easy to adjust the relative position between the collimator and the radiation source. However, if the material of the collimator la is replaced with a lightweight material that is easy to process, the dose characteristics of the collimator field will be reduced, and the penumbra and leakage of the field will increase.

Summary of the invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a method that is easy to process, low in production cost, light in weight, and easier to maintain the balance and stability of the treatment head during the rotation of the treatment frame, and easier to adjust The relative position between it and the radioactive source does not reduce the dose characteristics of the collimator field, and does not increase the penumbra of the field and the collimator and the treatment head. The specific technical solutions are as follows:

[0007] In the first aspect, an embodiment of the present invention provides a collimator, including:

[0008] The base body is provided with a first collimating hole;

[0009] A shield body disposed at the exit of the first collimating hole, the shield body is provided with a second collimating hole coaxially communicating with the first collimating hole;

[0010] The shielding body is composed of a shielding material for blocking radiation beams, and the base body is composed of a material having a density lower than that of the shielding body.

[0011] Specifically, as a preference, the shield is located on the side of the outlet of the first collimating hole of the base and is connected to the base.

[0012] Specifically, as a preference, the shielding body is disposed in the first collimating hole.

[0013] Specifically, as a preference, the material of the substrate is steel, aluminum, or aluminum alloy.

[0014] Specifically, as a preference, the material of the shielding body is tungsten, lead, or a tungsten alloy.

[0015] Specifically, as a preference, the collimating body further includes: a source-closing body; the source-closing body is embedded in a portion of the substrate where the first collimating hole is not provided for blocking the radiation beam.

[0016] Specifically, as a preference, the thickness of the source body is smaller than that of the base, or equal to the thickness of the base.

[0017] Specifically, as a preference, the material of the source body is tungsten, lead, or a tungsten alloy.

[0018] Specifically, as a preference, a plurality of first collimating hole groups with different pore sizes are provided on the substrate, and each first collimating hole group includes a plurality of first collimating holes with the same pore size.

[0019] In the second aspect, an embodiment of the present invention also provides a treatment head, the treatment head comprising: the collimator. [0020] The beneficial effects brought about by the technical solutions provided by the embodiments of the present invention are:

[0021] In the collimator provided by the embodiment of the present invention, a shield is provided at the exit of the first collimation hole on the base, and the shield is provided with a second collimation hole that is coaxially communicated with the first collimation hole Moreover, the shielding body is composed of a shielding material used to block radiation beams, and the base body is composed of a material with a density lower than that of the shielding body. On the one hand, the weight of the collimator is reduced, processing is convenient, and production costs are reduced. During the rotation, it is easier to maintain the balance and stability of the treatment head, and it is easier to adjust the relative position between it and the radiation source. On the other hand, the dosage characteristics of the collimating body's field are improved, so that penumbra and leakage of the field are reduced, avoiding damage to other normal tissues, and improving the treatment effect on target tumor tissues.

Description of the drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

[0023] FIG. 1 is a top view of a collimator provided by the prior art;

[0024] FIG. 2-1 is a cross-sectional view of the collimating body when the shielding body provided by the embodiment of the present invention has the first structure;

[0025] FIG. 2-2 is a cross-sectional view of the collimating body when the shielding body provided by the embodiment of the present invention has the second structure;

[0026] FIG. 3-1 is a top view of the collimating body when the source of the light source according to the embodiment of the present invention is in the first structure;

[0027] FIG. 3-2 is a cross-sectional view of the collimating body when the thickness of the source body and the base body are equal according to the embodiment of the present invention;

[0028] FIG. 3-3 is a cross-sectional view of the collimating body when the thickness of the source body is less than the thickness of the base body provided by the embodiment of the present invention;

[0029] FIG. 4 is a top view of the collimating body when the source-related body provided by the embodiment of the present invention is in the second structure.

[0030] Wherein, the reference signs respectively indicate:

[0031] la collimator,

[0032] laOl collimation hole,

[0033] lb 基体,

[0034] lbOl the first collimating hole,

[0035] 2 Shield,

[0036] 201 The second collimating hole,

[0037] 3 Guan Yuan Body,

[0038] 301 Sub-Guan Yuan Body.

Detailed ways

[0039] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meaning as commonly understood by those skilled in the art. Before describing the embodiments of the present invention in further detail, definitions are given for understanding some terms in the embodiments of the present invention.

[0040] In the present invention, "up" is defined as a position close to the radioactive source, and "down" is defined as a position far away from the radioactive source.

[0041] "Radiation dose" can be understood as the energy deposited by the radiation beam in the range of the radiation field. For example, the greater the intensity of the radiation beam, the greater the radiation dose generated by the radiation beam within the same field. The smaller the intensity of the radiation beam, the smaller the radiation dose produced by the radiation beam within the same field.

[0042] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to the accompanying drawings.

[0043] In the first aspect, an embodiment of the present invention provides a collimating body, as shown in FIG. 2-1 and FIG. 2-2, the collimating body includes: a base body lb, a first A collimating hole lbOl; a shielding body 2 arranged at the exit of the first collimating hole lbOl, and a second collimating hole 201 coaxially communicating with the first collimating hole lbOl is provided on the shielding body 2. The shielding body 2 is composed of a shielding material for blocking radiation beams, and the base body 1b is composed of a material having a density lower than that of the shielding body 2.

[0044] It should be noted that the material of the shield 2 is better than the material of the base 1b in shielding radiation beams and can sufficiently block the radiation beams. The density of the material of the base 1b is less than the density of the material of the shield 2.

[0045] The material of the substrate 1b may be metal materials such as steel, aluminum, aluminum alloy, or other composite materials. On the premise of low material cost and easy processing, as an optional method, the material of the base lb is steel, aluminum, or aluminum alloy. [0046] The shielding body 2 has a good shielding ability to the radiation beam, and its material can be, for example, tungsten, lead, tungsten alloy, composite shielding material containing tungsten or lead, etc. On the premise that the shielding effect of the radiation beam is good, as an optional method, the material of the shielding body 2 is magma, lead, or crane alloy.

[0047] In the collimator provided by the embodiment of the present invention, a shield 2 is provided at the exit of the first collimating hole lb01 on the base body 1b, and the shield 2 is provided with a coaxial communication with the first collimating hole lb01. The second collimating hole 201, and the shielding body 2 is composed of a shielding material for blocking radiation beams, and the base body lb is composed of a material with a density lower than that of the shielding body 2, which on the one hand reduces the weight of the collimator and is convenient Processing reduces the production cost, and avoids affecting the balance and stability of the treatment head during the rotation of the treatment frame, and facilitates adjustment of its relative position with the radioactive source. On the other hand, it also enhances the shielding ability of the radiation beam emitted from the second collimating hole 201, improves the dose characteristics of the collimator, reduces the penumbra and leakage of the field, and avoids damage to other normal tissues. Improve the therapeutic effect on the target tumor tissue.

[0048] The shielding body 2 may be located on the outlet side of the first collimating hole lb01 of the base body 1b, and be connected to the base body.

[0049] The base 1b can be provided in a variety of structures. For example, the base 1b can have a square block structure, an arc-shaped or columnar structure, or other structures. The embodiment of the present invention does not specifically limit the structure of the base 1b, and can be combined with Just fit the treatment head.

[0050] The shielding body 2 can be provided in a variety of structures. For example, the shielding body 2 can be a block, an arc-shaped body, a cylindrical structure, or other structures. The embodiment of the present invention does not specifically limit the structure of the shielding body 2. It can be matched with the base body lb.

[0051] As a first example, as shown in FIG. 2-1, when the base body 1b has a square block structure, the shielding body 2 has a square block structure, which is located on the outlet side of the first collimating hole lbO1 of the base body 1b. , And connected with the base lb, that is, the shield 2 is located below the base lb, and its upper end surface is connected with the lower end surface of the base lb.

[0052] Illustratively, when the base body 1b is an arc-shaped body structure, the shielding body 2 is an arc-shaped body structure, which is located on the outlet side of the first collimating hole lb01 of the base body 1b, and is connected to the base body 1b, ie: shielding The body 2 is located inside the base 1b, and its outer surface is connected to the inner surface of the base 1b.

[0053] Illustratively, when the base body 1b is a columnar structure, the shielding body 2 is a cylindrical structure, which is located on the side of the outlet of the first collimating hole lb01 of the base body 1b, and is connected to the base body 1b, that is, the shielding body 2 is located Outside the base lb, its inner surface is connected to the outer surface of the base lb.

[0054] In application, the radiation beam sequentially passes through the first collimating hole lb01 on the base 1b and the second collimating hole 201 on the shielding body 2, so that the radiation passing through the second collimating hole 201 is emitted. The beam half field at the focal point is reduced to avoid damage to other normal tissues, and the radiation source dose distribution characteristics are optimized, which improves the treatment effect on tumors.

[0055] There are many ways to connect the base body 1b and the shielding body 2. For example, the two can be connected by embedding, snapping or mechanical connection, or they can be integrally formed to obtain the embodiment of the present invention. The collimator.

[0056] When the base body 1b is clamped with the shielding body 2, a plurality of clamping grooves are provided on the surface of the base body 1b connected to the shielding body 2, and a plurality of clamping grooves are provided on the surface of the shielding body 2 connected to the end surface of the base body 1b. The clamping body adapted to the clamping groove clamps the clamping body and the clamping groove to realize the clamping of the base body 1b and the shielding body 2. The clamping body can be configured as an arc-shaped body, a square body, or other irregular structures, and the clamping groove is a structure adapted to the clamping body.

[0057] In order to avoid leakage of the radiation beam in the gap between the base 1b and the shield 2, as an optional way, the base 1b and the shield 2 are integrally formed.

[0058] The shielding body 2 may also be disposed in the first collimating hole lb01.

[0059] As a second example, as shown in FIG. 2-2, the shielding body 2 is a ring-shaped body, which is disposed in the first collimating hole lb01. [0060] That is, the shielding body 2 is a plurality of independent annular bodies, which are respectively arranged at the exit of each first collimating hole lb01, and the through hole on each annular shielding body 2 (ie: the second collimating hole 201 ) It is coaxially communicated with the corresponding first collimating hole lb01. By providing the shielding body 2 in this way, the materials used for the shielding body 2 can be saved, and the weight of the collimating body provided by the embodiment of the present invention can be reduced.

[0061] In application, the radiation beam sequentially passes through the first collimating hole lb01 on the base body 1b, and the second collimating hole 201 on the shielding body 2 disposed at the exit of the first collimating hole 1b01, so that The radiation beam passing through the second collimating hole 201 has a reduced radiation field half field at the focal point, avoiding damage to other normal tissues, optimizing the radiation source dose distribution characteristics, and improving the treatment effect on tumors.

[0062] 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 shielding body 2 is flush with the lower end of the base body 1b .

[0063] In this example, the outer contour of the shielding body 2 can be set to a variety of structures, as long as the second collimating hole 201 on the shielding body 2 is in coaxial communication with the first collimating hole lb01. For example, the outer contour of the shielding body 2 may be a square, a cylinder, a hexagonal cylinder, etc., to satisfy the requirement that the side wall of the shielding body 2 is seamlessly connected to the inner wall of the first collimating hole lbOl, or an interference fit, that is, Can. In this example, the shielding body 2 is a ring-shaped body, and the outer contour of the shielding body 2 is not specifically limited.

[0064] The shielding body 2 can be arranged in the first collimating hole lb01 in a variety of ways, for example, the shielding body 2 is formed with the base body lb-body, or the shielding body 2 is embedded in the wall of the first collimating hole lb01, Or it is clamped with the inner wall of the first collimating hole lb01.

[0065] When using the collimator provided by the embodiment of the present invention, take it as an example to install it on the treatment head to treat the tumor tissue, the multiple radiation beams emitted by the multiple radiation sources on the treatment head respectively pass through After the multiple first collimating holes lb01 on the base body 1b and the multiple second collimating holes 201 on the shielding body 2, focus on the target tumor tissue to treat the tumor tissue. When the treatment is stopped, the radiation beam is shielded.

[0066] When the treatment is stopped, the portion of the base body 1b that is not provided with the first collimation hole 1b01 can be used to align with the multiple radiation sources to shield the multiple radiation beams.

[0067] In order to enhance the shielding effect of the portion of the substrate lb where the first collimating hole lb01 is not provided on the radiation beam, as shown in FIG. 3-1, the collimator provided by the embodiment of the present invention further includes: a source body 3; The off source body 3 is embedded in the base lb where the first collimating hole lbOl is not provided for blocking the radiation beam.

[0068] It should be noted that the base body 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 lb (that is, the end close to the radioactive source) as an example, the source control body 3 can be inserted into the base body lb from the position on the upper end surface of the base body lb where the first collimating hole lbOl is not provided, and it is necessary to ensure that the source control body 3 does not Affect the use of the first collimating hole lbOl.

[0069] When the treatment is stopped, the position of the base body 1b is adjusted so that the multiple radiation sources are aligned with the source body 3 to shield the radiation beam.

[0070] The source body 3 can be set in a variety of structures, and the following two examples are given on the premise of easy setting and convenient radiation shielding:

[0071] As a first example, as shown in FIG. 3-1, the source body 3 is a block, which is embedded in the base lb from the middle of the upper end surface of the base lb. At this time, the first collimating hole lb01 is located on both sides of the base body lb.

[0072] When the treatment is stopped, the base body 1b is moved to align the source-closing body 3 with the beam exits of the multiple radiation sources, thereby shielding the rays.

[0073] The above-mentioned source blocking body 3 is a whole and easy to set up. When adjusting the position of the collimator, the source blocking body 3 can be quickly aligned with the beam outlets of multiple radiation sources, thereby blocking the radiation beam.

[0074] In this example, the source body 3 can be set in a variety of block shapes, such as a square block, a trapezoidal block, a column, etc., which can block radiation beams emitted by multiple radiation sources at the same time. That is, the structure of the Guanyuan body 3 is not specifically limited.

[0075] As a second example, as shown in FIG. 4, one or more first collimating hole groups may be provided on the base 1b, and each first collimating hole group includes a plurality of first collimating holes 1b01 , Guanyuan body 3 includes: at least one set of sub-guanyuan body groups; and, the number and arrangement of sub-guanyuan bodies 301 in any sub-guanyuan body group are the same as those in any first collimating hole group. The number and arrangement of the collimating holes lbOl are correspondingly the same.

[0076] That is, the number of sub-source groups is at least one group, each sub-source group 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 body group The cloth method is the same. In addition, the number and arrangement of the plurality of sub-sources 301 in each sub-source group are the same as the number and arrangement of the plurality of first collimating holes lb01 in any first collimating hole group.

[0077] When the treatment is stopped, the base body 1b is adjusted so that the beam outlets of the multiple radiation sources are aligned with the multiple sub-source bodies 301 respectively, and the radiation beams are shielded.

[0078] The arrangement of the plurality of first collimating holes lb01 in the first collimating hole group is the same as the arrangement of the multiple radiation sources, so that the radiation beam can pass through the plurality of first collimating holes lb01, and The arrangement of the multiple sub-source bodies 301 in the sub-passage source body group is set to be the same as the arrangement of the plurality of first collimation holes lbOl in any first collimation hole group, so as to facilitate the sub-passage source body The multiple sub-source bodies 301 in the group are aligned with the beam exits of the multiple radiation sources, thereby shielding the rays.

[0079] 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.

[0080] Specifically, the number of sub-pass source body groups may be more or less than that of the first collimating hole group, or may be the same.

[0081] When the number of sub-pass source groups is equal to or less than the number of the first collimation hole group, at least one group of sub-pass source groups can be aligned along the first collimation hole group. The arrangement direction of the straight hole group is set between two adjacent first collimating holes ^. It is also possible to make each of the at least one group of sub-source groups set in any first collimating hole group, and make the multiple sub-source groups 301 in each group of sub-source groups and The multiple first collimating holes 1MU in the corresponding first collimating hole group are alternately arranged.

[0082] In order to facilitate the installation, reduce the processing steps, and reduce the production cost, as an optional way, as shown in FIG. 4, the Guanyuan body 3 includes a group of sub-guanyuan bodies; a plurality of sub-guanyuan bodies 301 Alternately arranged with the plurality of first collimating holes 1bol in any group.

[0083] The structure of the sub-gate source body 301 can be set to a variety of types, for example, a square block structure, a round block structure, a triangular block structure, or other regular and irregular block structures, which will not be described here. It is specifically limited as long as the beam exit of the radiation source can be shielded or blocked.

[0084] In the above two examples, the thickness of the source body 3 may be smaller than the thickness of the base body 1b, see FIG. 3-3, or equal to the thickness of the base body 1b, see FIG. 3-2.

[0085] The greater the thickness of the source body 3, the better the effect of shielding the radiation beam.

[0086] The source body 3 is composed of a material sufficient to block the radiation beam, and its shielding effect of the radiation beam is better than that of the base body 1b. The source body 3 can be made of various shielding materials, such as tungsten, lead, tungsten alloy, composite shielding material containing tungsten or lead, and the like. On the premise that the shielding effect of the radiation beam is good, the material of the source body 3 is tungsten, lead, or tungsten alloy.

[0087] In the embodiment of the present invention, a group of first collimating hole groups may be provided on the base 1b, or multiple groups of first collimating hole groups may be provided. In the treatment of different tumor tissues, in order to adjust the radiation dose to efficiently kill tumor cells and protect other normal tissues, a plurality of first collimating hole groups with different pore sizes are provided on the substrate lb, each The first collimating hole group includes a plurality of first collimating holes 1b01 with the same diameter.

[0088] When adjusting the radiation dose, determine the quantitative inner diameter of the first collimating hole 1b01 that is adapted to the radiation dose, and combine a set of first collimating hole groups with a quantitative inner diameter and the beam exits of multiple radiation sources Align to facilitate the use of appropriate radiation dose to treat tumor tissue.

[0089] Specifically, each group of the first collimating hole group includes a plurality of first collimating holes 01, and the axes of the plurality of first collimating holes lb01 in each group are focused at a preset position below the base body lb, so as to facilitate the respective The multiple radiation beams passing through the multiple first collimating holes 1b01 in the same group are focused at a preset position under the base 1b along the axis direction.

[0090] The inner diameters of the first collimating holes 1 bo 1 of different groups are different, and the first collimating holes 1 bo 1 of different groups are selected to allow the radiation beam to pass through and focus, so that different radiation doses and radiation can be obtained. Radiation focus of the field, and then treat different tumor tissues.

[0091] The multiple first collimating holes lb01 in different groups are arranged in the same manner to facilitate matching with multiple radioactive sources, and the arrangement of the first collimating holes lb01 of each group is the same as that of the multiple radioactive sources. The same way.

[0092] In the second aspect, an embodiment of the present invention also provides a treatment head, the treatment head comprising: the above-mentioned collimating body.

[0093] Due to the light weight of the collimator installed on the treatment head, and excellent radiation field dose characteristics, the penumbra and missed shot of the field are small, it is convenient to adjust the relative position of the collimator and the treatment head. When the treatment head moves or rotates, the treatment head can be kept balanced and stable.

[0094] The treatment head can be used in a variety of equipment. As an alternative, the treatment head is used in multi-source focused stereotactic radiotherapy. Among them, the treatment head is installed on the treatment frame. The following is a detailed description of using this treatment head to treat tumor tissues:

[0095] When treating tumor tissue, adjust the relative position of the collimator and the multiple radioactive sources in the treatment head, so that the first collimating holes 1b01 and the multiple radioactive sources in a collimating hole group on the collimating body The beam exits are aligned, and after the multiple beams pass through the plurality of first collimating holes 1b01, they are focused at a preset position under the collimator to treat the target tumor tissue.

[0096] When adjusting the radiation dose, determine the first collimating hole group adapted to the radiation dose, and combine the multiple first collimating holes lb01 in the first collimating hole group with the beams of the multiple radiation sources The exit is aligned.

[0097] When the treatment is stopped, the source-closing body 3 on the collimator is aligned with the beam exits of the multiple radiation sources to shield the rays.

[0098] The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be applicable. It is included in the protection scope of the present invention.

Claims (10)

1. A collimating body, characterized by comprising: a base body (lb), the base body (lb) is provided with a first collimating hole (lbOl); arranged in the first collimating hole (lb〇l) ) The shield (2) at the exit, the shield (2) is provided with a second collimation hole (201) coaxially communicating with the first collimation hole (lbOl); the shield (2) ) Is composed of a shielding material for blocking radiation beams, and the base body (lb) is composed of a material having a density lower than that of the shielding body (2). 2. The collimating body according to claim 1, wherein the shielding body (2) is located on the side of the outlet of the first collimating hole (lbOl) of the base body (lb), and is in contact with the base body (lb). Phase connection. 3. The collimating body according to claim 1, wherein the shielding body (2) is arranged in the first collimating hole (lbOl). 4. The collimator according to claim 1, wherein the material of the base body (lb) is steel, aluminum, or aluminum alloy. 5. The collimator according to claim 1, wherein the shielding body (2) is made of tungsten, lead, or a tungsten alloy. 6. The collimating body according to claim 1, characterized in that, the collimating body further comprises: a Guanyuan body (3); the Guanyuan body (3) is embedded in the base body (lb) and is not provided The position of the first collimating hole (lbOl) is used to block the radiation beam. 7. The collimator according to claim 6, characterized in that the thickness of the source-related body (3) is smaller than that of the base body (lb), or equal to the thickness of the base body (lb). 8. The collimator according to claim 6, characterized in that the material of the source-gate (3) is tungsten, lead, or a tungsten alloy. 9. The collimating body according to claim 1, wherein a plurality of first collimating hole groups with different pore sizes are provided on the base body (lb), and each first collimating hole group includes a plurality of The first collimating hole (lbOl) with the same aperture. 10. A treatment head, wherein the treatment head comprises: the collimator according to any one of claims 1-9.