CN216222647U - Multi-blade collimator and treatment head - Google Patents
Multi-blade collimator and treatment head Download PDFInfo
- Publication number
- CN216222647U CN216222647U CN202121422151.8U CN202121422151U CN216222647U CN 216222647 U CN216222647 U CN 216222647U CN 202121422151 U CN202121422151 U CN 202121422151U CN 216222647 U CN216222647 U CN 216222647U
- Authority
- CN
- China
- Prior art keywords
- blade
- blades
- attenuation coefficient
- area
- leaf collimator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Radiation-Therapy Devices (AREA)
Abstract
The application discloses multi-leaf collimator and treatment head belongs to medical instrument technical field. The multileaf collimator comprises: the box, upper blade group and lower floor's blade group. The upper layer of the blade group can form a first radiation field area, and a penumbra area exists at the edge of the first radiation field area. The lower leaf set may form a second field region. Because the orthographic projection of the second radiation field area on the reference surface is positioned in the orthographic projection of the first radiation field area on the reference surface, the rays in the penumbra area can be shielded by the second blades in the lower-layer blade group, so that the attenuation degree of the rays in the penumbra area is improved, the probability that the rays in the penumbra area irradiate the normal tissues at the periphery of the tumor area is reduced, and the treatment effect of the radiotherapy equipment is improved.
Description
Technical Field
The application relates to the technical field of medical instruments, in particular to a multi-blade collimator and a treatment head.
Background
Radiotherapy is an important means for treating cancer, and radiotherapy equipment (radiotherapy equipment for short) is a key medical equipment for carrying out radiotherapy. Among them, the multileaf collimator is a mechanical moving part for generating a conformal radiation field, and belongs to an important component part of radiotherapy equipment.
In the related art, a multi-leaf collimator generally includes a housing, and a plurality of leaves located in the housing. The plurality of blades can move along the direction perpendicular to the emitting direction of the ray to form a field area for beam-forming the ray beam generated by the ray source, and the ray beam can form an irradiation field corresponding to the shape of the tumor after passing through the field area.
However, the multi-leaf collimator forms a penumbra region after the beam is shaped, and because the attenuation degree of the rays in the penumbra region is low, the rays in the penumbra region can irradiate normal tissues at the periphery of a tumor region, so that the normal tissues are damaged, and the treatment effect of the radiotherapy equipment is poor.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a multi-blade collimator and a treatment head. The problem of poor treatment effect of radiotherapy equipment among the prior art can be solved, technical scheme is as follows:
in one aspect, there is provided a multi-leaf collimator comprising:
the blade assembly comprises a box body, an upper layer blade group and a lower layer blade group which are positioned in the box body and are stacked along a first direction;
the upper blade group includes: a plurality of first blades, each of the first blades moving in a direction perpendicular to the first direction so that the plurality of first blades form a first field region;
the lower blade group includes: a plurality of second blades, each of the second blades moving in a direction perpendicular to the first direction to form a second portal region of the plurality of second blades;
the orthographic projection of the second field area on a reference surface vertical to the first direction is positioned in the orthographic projection of the first field area on the reference surface; wherein the attenuation coefficient of the first blade is greater than the attenuation coefficient of the second blade.
In one embodiment, each of the first vanes includes a first end proximate the first field region and an opposite second end, and each of the first vanes includes a plurality of segments;
wherein the attenuation coefficient of each section in the first blade is the same, and the attenuation coefficients of the sections in the first blade are sequentially reduced along the direction from the second end to the first end.
In one embodiment, each of the second blades comprises a third end near the second portal area and an opposite fourth end, and each of the second blades comprises a plurality of sections;
wherein the attenuation coefficient of each section in the second blade is the same, and the attenuation coefficients of the sections in the second blade are sequentially reduced along the direction from the fourth end to the third end.
In one embodiment, the maximum attenuation coefficient of each section in the second blade is less than or equal to the minimum attenuation coefficient of each section in the first blade.
In one embodiment, the material of the first blade is the same as that of the second blade, and in the first blade and the second blade, the thickness of the section with the large attenuation coefficient in the first direction is larger than that of the section with the small attenuation coefficient in the first direction;
or, in the first direction, the thickness of the first blade is the same as that of the second blade, and materials with different attenuation coefficients are used for the sections with different attenuation coefficients in the first blade and the second blade.
In one embodiment, the profile of the second portal region is the same as the profile of the first portal region.
In one embodiment, the contour size of the first field region is the same as the contour size of the target region to be irradiated;
the outline size of the second radiation field area is smaller than that of the first radiation field area.
In one embodiment, the cross-section of the first blade and the cross-section of the second blade perpendicular to the first direction are triangular, the plurality of first blades form the first radiation field area in a surrounding manner, and the plurality of second blades form the second radiation field area in a surrounding manner.
In one embodiment, the first blades are arranged oppositely in pairs, and each pair of the first blades is opened and closed along a second direction perpendicular to the first direction; the plurality of second blades are arranged in a pairwise opposite mode, and each pair of second blades are opened and closed along a third direction perpendicular to the first direction.
In one embodiment, the second direction is parallel to the third direction, a first gap exists between any two adjacent first blades, a second gap exists between any two adjacent second blades, and the first gap and the second gap are arranged in a staggered manner in the first direction.
In another aspect, a therapy head is provided, the therapy head comprising: a radiation source and a multi-leaf collimator as described in any one of the above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the multi-leaf collimator provided by the embodiment of the application comprises: the box, upper blade group and lower floor's blade group. The upper layer of the blade group can form a first radiation field area, and a penumbra area exists at the edge of the first radiation field area. The lower leaf set may form a second field region. Because the orthographic projection of the second radiation field area on the reference surface is positioned in the orthographic projection of the first radiation field area on the reference surface, the rays in the penumbra area can be shielded by the second blades in the lower-layer blade group, so that the attenuation degree of the rays in the penumbra area is improved, the probability that the rays in the penumbra area irradiate the normal tissues at the periphery of the tumor area is reduced, and the treatment effect of the radiotherapy equipment is improved. Furthermore, because the attenuation coefficient of the second blade is smaller than that of the first blade, the manufacturing cost of the second blade is lower, and the manufacturing cost of the multi-blade collimator is further reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multi-leaf collimator provided in an embodiment of the present application;
FIG. 2 is a top view of any one layer of leaf bank in the multi-leaf collimator shown in FIG. 1;
FIG. 3 is a schematic diagram of an orthographic projection of a field area formed by the multi-leaf collimator shown in FIG. 1 on a reference plane perpendicular to a first direction;
FIG. 4 is a schematic structural diagram of a first blade and a second blade provided by an embodiment of the present application;
FIG. 5 is a top view of a leaf in a multi-leaf collimator according to an embodiment of the present disclosure;
FIG. 6 is a top view of a leaf in another multi-leaf collimator provided by an embodiment of the present application;
FIG. 7 is a top view of a leaf in yet another multi-leaf collimator provided by an embodiment of the present application;
fig. 8 is a side view of the blade shown in fig. 7.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a multi-leaf collimator according to an embodiment of the present disclosure. The multi-leaf collimator 000 may include:
the blade assembly comprises a box body 100, and an upper blade group 200 and a lower blade group 300 which are positioned in the box body 100 and are stacked along a first direction x. Wherein the first direction x is the exit direction of the ray bundle.
In an embodiment of the utility model, the multi-leaf collimator 000 may be mounted on a support plate in the treatment head in general. Illustratively, the housing 100 of the multi-leaf collimator 000 may be slidably coupled to a support plate having a radiation aperture through which the beam passes. Thus, the ray bundle emitted from the treatment head can be emitted to the upper blade assembly 200 and the lower blade assembly 300 through the radiation through hole.
As shown in fig. 2, fig. 2 is a top view of any one layer of the leaf sets in the multi-leaf collimator shown in fig. 1. The upper blade group 200 may include: a plurality of first blades 201, each of the first blades 201 moving in a second direction y perpendicular to the first direction x, such that the plurality of first blades 201 form a first field area. By way of example, each first blade 201 may be moved to a different position along the second direction y, such that a plurality of first blades 201 may be grouped into: and the first field area is used for allowing the ray bundle to pass through and carrying out beam shaping on the ray bundle.
The lower blade set 300 may include: and a plurality of second blades 301, each of the second blades 301 moving in a third direction z perpendicular to the first direction x, such that the plurality of second blades 301 form a second field region. By way of example, each second blade 301 may be moved to a different position along the third direction z, such that a plurality of second blades 301 may be grouped into: and the second field area is used for allowing the ray bundle to pass through and carrying out beam shaping on the ray bundle.
As shown in fig. 3, fig. 3 is a schematic diagram of an orthographic projection of a field area formed by the multi-leaf collimator shown in fig. 1 on a reference plane perpendicular to a first direction. The orthographic projection of the second field region 301a on the reference surface is located in the orthographic projection of the first field region 201a on the reference surface. Wherein the reference plane may be a plane perpendicular to the first direction x on the case 100.
Fig. 1 and 2 are schematic illustrations of an example in which the movement direction of the first blade 201 and the movement direction of the second blade 301 are parallel to each other. In other possible manners, the moving direction of the first blade 201 and the moving direction of the second blade 301 may be perpendicular to each other or may form a predetermined angle.
In one embodiment, the attenuation coefficient of the first blade 201 is greater than the attenuation coefficient of the second blade 301. In an implementation manner, when the materials of the first blade 201 and the second blade 301 are the same, it is necessary to ensure that the thickness of the first blade 201 in the first direction x is greater than that of the second blade 301 in the first direction x, so that the attenuation coefficient of the first blade 201 can be ensured to be greater than that of the second blade.
In another implementation manner, when the thicknesses of the first blade 201 and the second blade 301 in the first direction x are the same, it is required to ensure that the first blade 201 is made of a shielding material with a larger attenuation coefficient, and the second blade 301 is made of a shielding material with a smaller attenuation coefficient, so that it can be ensured that the attenuation coefficient of the first blade 201 is larger than that of the second blade.
In yet another implementation manner, when the first blade 201 and the second blade 301 are made of different materials and have different thicknesses in the first direction x, if the first blade 201 is made of a shielding material with a higher attenuation coefficient, the second blade 301 is made of a shielding material with a lower attenuation coefficient, and the thickness of the first blade 201 in the first direction x is greater than the thickness of the second blade 301 in the first direction x. It can be ensured that the attenuation coefficient of the first blade 201 is larger than the attenuation coefficient of the second blade.
In the related art, the edge of the field area formed by the multi-leaf collimator after beam shaping the beam may form a penumbra area. Since the attenuation degree of the radiation is low in the penumbra region, the radiation in the penumbra region can irradiate the normal tissue at the periphery of the tumor region, so that the normal tissue is damaged, and the treatment effect of the radiotherapy device is poor.
In the present embodiment, the upper blade group 200 and the lower blade group 300 are stacked in the housing 100 of the multi-blade collimator 000, and after the multi-blade collimator 000 is mounted on the treatment head, the plurality of first blades 201 in the upper blade group 200 can be moved in the second direction y to shape the beam emitted from the treatment head to form the first field area 201 a. The edge of the first field region 201a has a penumbra region. At the same time, the plurality of second blades 301 in the lower blade group 200 may be moved in the third direction z to further beam the radiation emitted from the first field area 201a, thereby forming the second field area 301 a. Because the orthographic projection of the second radiation field area 301a on the reference surface is positioned in the orthographic projection of the first radiation field area 201a on the reference surface, the plurality of second blades 301 can shield rays in the penumbra area, so that the attenuation degree of the rays in the penumbra area is improved, the probability that the rays in the penumbra area irradiate normal tissues at the periphery of the tumor area is reduced, and the treatment effect of the radiotherapy equipment is improved.
In one embodiment, since the attenuation coefficient of the second leaf 301 is smaller than that of the first leaf 201, the manufacturing cost of the second leaf 301 is lower, thereby reducing the manufacturing cost of the multi-leaf collimator 300.
In summary, the multi-leaf collimator provided by the embodiment of the present application includes: the box, upper blade group and lower floor's blade group. The upper layer of the blade group can form a first radiation field area, and a penumbra area exists at the edge of the first radiation field area. The lower leaf set may form a second field region. Because the orthographic projection of the second radiation field area on the reference surface is positioned in the orthographic projection of the first radiation field area on the reference surface, the rays in the penumbra area can be shielded by the second blades in the lower-layer blade group, so that the attenuation degree of the rays in the penumbra area is improved, the probability that the rays in the penumbra area irradiate the normal tissues at the periphery of the tumor area is reduced, and the treatment effect of the radiotherapy equipment is improved. Furthermore, because the attenuation coefficient of the second blade is smaller than that of the first blade, the manufacturing cost of the second blade is lower, and the manufacturing cost of the multi-blade collimator is further reduced.
In the embodiment of the present application, as shown in fig. 3, the profile of the second field area 301a formed by the plurality of second blades 301 in the lower blade group 300 is the same as the profile of the first field area 201a formed by the plurality of first blades 201 in the upper blade group 200.
In one embodiment, the contour size of the first field region 201a is the same as the contour size of the target to be irradiated, and the contour size of the second field region 301a is smaller than the contour size of the first field region 201 a. Also, the contour size of the first field region 201a may be the same as the contour size of a tumor region in the target region to be irradiated. Note that, in the present application, the outline of the field region (i.e., the first field region 201a and the second field region 301a) refers to: the ray beam passes through the field area and forms the contour of the field at the isocenter. The outline size of the radiation field area is as follows: the beam of rays passes through the field area and forms the contour size of the field at the isocenter.
In one embodiment, as shown in fig. 4, fig. 4 is a schematic structural diagram of a first blade and a second blade provided in the embodiments of the present application. Each first vane 201 includes a first end 2011 proximate to the first field region 201a and an opposite second end 2012, and each first vane includes a plurality of segments a. It should be noted that, for any two adjacent segments a in the first blade 201, the joint surface between the two adjacent segments a may be a plane, a cambered surface, a sawtooth surface, or the like. The attenuation coefficient of each section a in the first blade 201 is the same, and the attenuation coefficients of the plurality of sections a in the first blade 201 decrease sequentially in the direction from the second end 2012 to the first end 2011. The manufacturing cost of the material with higher attenuation coefficient is higher, and the manufacturing cost of the material with lower attenuation coefficient is lower. Therefore, when the first leaf 201 includes a plurality of sections a having different attenuation coefficients, the manufacturing cost of the first leaf 201 can be reduced, thereby further reducing the manufacturing cost of the multi-leaf collimator 000. In other possible implementations, if the first blade 201 includes three or more sections, the attenuation coefficient of the section located in the middle is smaller, and the attenuation coefficients of the sections located on both sides are larger.
For example, the number of the plurality of sections a may be two. And the two sections A are respectively: section a1 near first end 2011 and section a2 near second end 2012. Wherein the attenuation coefficient of section A1 is less than the attenuation coefficient of section A2. It is understood that the number of the plurality of sections a may also be three, four, five or more.
In one embodiment, as shown in fig. 4, each second blade 301 includes a third end 3011 adjacent to the second portal area 301a and an opposite fourth end 3012, and each second blade 301 includes a plurality of segments B. In addition, for any two adjacent segments B in the second blade 301, the joint surface between the two adjacent segments B may be a plane, a cambered surface, a sawtooth surface, or the like. Wherein the attenuation coefficient of each section B in the second blade 301 is the same, and the attenuation coefficients of the plurality of sections B in the second blade 301 decrease sequentially along the fourth end 3012 to the third end 3011. The manufacturing cost of the material with higher attenuation coefficient is higher, and the manufacturing cost of the material with lower attenuation coefficient is lower. Therefore, when the second leaf 301 includes a plurality of sections B different in attenuation coefficient, the manufacturing cost of the second leaf 301 can be reduced, thereby further reducing the manufacturing cost of the multi-leaf collimator 000. In other possible implementations, if the second blade 301 includes three or more sections, the attenuation coefficient of the section located in the middle is smaller, and the attenuation coefficients of the sections located on both sides are larger.
For example, the number of the plurality of sections B may be two. And the two sections B are respectively: section B1 near third end 3011 and section B2 near fourth end 3012. Wherein the attenuation coefficient of section B1 is less than the attenuation coefficient of section B2. It is understood that the number of the plurality of sections B may be three, four, five or more.
In one embodiment, the maximum attenuation coefficient of each section B in the second blade 301 is less than or equal to the minimum attenuation coefficient of each section A in the first blade 201. In this way, it is ensured that the attenuation coefficient of the first blade 201 is greater than that of the second blade 301. The maximum attenuation coefficient of each section B in the second blade 301 refers to: an attenuation coefficient corresponding to a section having the largest attenuation coefficient among the plurality of sections B in the second blade 301; the minimum attenuation coefficient of each section a in the first blade 201 refers to: the section having the smallest attenuation coefficient among the plurality of sections a in the first blade 201 corresponds to the attenuation coefficient.
In one embodiment, the attenuation coefficients of the plurality of sections a in the first blade 201 decrease sequentially along the direction from the second end 2012 to the first end 2011, and the attenuation coefficients of the plurality of sections a in the second blade 301 decrease sequentially along the direction from the third end 3011 to the fourth end 3012, which is schematically illustrated by taking the following two possible implementations as examples in the embodiment of the present application:
in a first possible implementation, the material of the first blade 201 is the same as the material of the second blade 301. For example, the material of the first blade 201 and the material of the second blade 301 may each include: tungsten, lead, gold, copper, iron, polymethyl methacrylate, and the like. Since the thickness of the shielding material is positively correlated with the attenuation coefficient thereof. Therefore, when the material of the first blade 201 is the same as that of the second blade 301, in the first blade 201 and the second blade 301, the thickness in the first direction x of the section having a large attenuation coefficient is larger than the thickness in the first direction x of the section having a small attenuation coefficient. In this way, the section having a large thickness in the first direction x has a large attenuation coefficient, and the section having a small thickness in the first direction x has a small attenuation coefficient, and the manufacturing cost thereof is low.
In a second possible implementation, the thickness of the first blade 201 is the same as that of the second blade 301 in the first direction x, and the sections a with different attenuation coefficients in the first blade 201 and the second blade 301 use materials with different attenuation coefficients.
For example, in the first blade 201 and the second blade 301, the material of the section with the larger attenuation coefficient may include: tungsten, lead, gold, etc., the material of the section a with the smaller attenuation coefficient may include: copper, iron, polymethyl methacrylate, etc.
In one embodiment, there are many possible implementation manners of the arrangement of the first blade 201 and the second blade 301, and the embodiment of the present application is schematically illustrated by taking the following two possible implementation manners as examples:
in a first possible implementation manner, as shown in fig. 5, fig. 5 is a top view of a leaf in a multi-leaf collimator provided by an embodiment of the present application. The cross section of the first blade 201 and the second blade 301 on the plane perpendicular to the first direction x is triangular, a plurality of first blades 201 surround to form a first radiation field area 201a, and a plurality of second blades 301 surround to form a second radiation field area 301 a. In this case, the moving directions of the first blades 201 in the upper blade group 200 are different, but the moving directions of the first blades 201 are all perpendicular to the first direction x, and the moving directions of the first blades 201 are distributed around the central axis of the ray bundle; the moving directions of the second blades 301 in the lower blade group 300 are different, but the moving directions of the second blades 301 are perpendicular to the first direction x, and the moving directions of the second blades 301 are distributed around the central axis of the ray bundle.
In a second possible implementation manner, as shown in fig. 6 or fig. 7, fig. 6 is a top view of a leaf in another multi-leaf collimator provided in an embodiment of the present application, and fig. 7 is a top view of a leaf in another multi-leaf collimator provided in an embodiment of the present application. The plurality of first blades 201 are arranged opposite to each other, and each pair of first blades 201 opens and closes along the second direction x. The plurality of second blades 301 are arranged opposite to each other, and each pair of second blades 301 opens and closes along the third direction y. That is to say that the first and second electrodes,
wherein the second direction and the third direction may be perpendicular; the second direction and the third direction may also be parallel; the second direction and the third direction can also form a preset angle; in this embodiment, the specific form of the second direction and the third direction is not limited.
Thus, the shape of the first field region 201a formed by the plurality of first leaves 201 and the shape of the second field region 301a formed by the plurality of second leaves 301 can be closer to the shape of the tumor of the patient, and the resolution of the edge of the first field region 201a formed by the first leaves 201 and the second field region 301a formed by the second leaves 301 can be improved.
In one implementation, as shown in fig. 6, the second direction y is perpendicular to the third direction z, that is, the moving direction of the first blade 201 is perpendicular to the moving direction of the second blade 301.
In another implementation, as shown in fig. 7, the second direction y is parallel to the third direction z, that is, the moving direction of the first blade 201 is parallel to the moving direction of the second blade 301.
In one embodiment, as shown in FIG. 8, FIG. 8 is a side view of the blade shown in FIG. 7. A first gap is formed between any two adjacent first blades 201 in the upper blade group 200, and a second gap is formed between any two adjacent second blades 301 in the lower blade group 300, and the first gap and the second gap are arranged alternately in the first direction x. In this way, the resolution of the edges of the first field region 201a formed by the first blades 201 and the second field region 301a formed by the second blades 301 can be increased, and the shape of the field obtained by the radiation beam passing through the first field region 201a and the second field region 301a can be made closer to the shape of the tumor of the patient. Moreover, the probability of the radiation beam leaking between any two adjacent first blades 201 can be reduced. For example, after the ray bundle is emitted from the first gap between any two adjacent first blades 201 in the upper blade group 200, the ray bundle is blocked by a corresponding second blade 301 in the lower blade group 300, and the probability of emitting and leaking the ray bundle is effectively reduced.
For example, the upper blade assembly 200 may further include: a first blade driving structure (not shown) connected to the first blade 201. The first blade driving structure can drive the first blade 201 to move in the second direction y. By way of example, the first blade driving structure may include: a first blade driving motor, and a first transmission structure connected to the first blade driving motor, the first transmission structure may also be connected to the first blade 201. The first blade driving motor may drive the first blade 201 to move in the second direction y through the first transmission structure. It should be noted that the first transmission structure may be a screw nut transmission structure.
The lower blade set 300 may further include: a second blade drive structure (not shown) connected to the second blade 301. The second blade driving structure can drive the second blade 301 to move in the third direction z. By way of example, the second blade driving structure may comprise: a second blade drive motor, and a second transmission structure connected to the second blade drive motor, which may also be connected to the second blade 301. The second blade driving motor may drive the second blade 301 to move in the third direction z through the second transmission structure. It should be noted that the second transmission structure may be a screw nut transmission structure.
In summary, the multi-leaf collimator provided by the embodiment of the present application includes: the box, upper blade group and lower floor's blade group. The upper layer of the blade group can form a first radiation field area, and a penumbra area exists at the edge of the first radiation field area. The lower leaf set may form a second field region. Because the orthographic projection of the second radiation field area on the reference surface is positioned in the orthographic projection of the first radiation field area on the reference surface, the rays in the penumbra area can be shielded by the second blades in the lower-layer blade group, so that the attenuation degree of the rays in the penumbra area is improved, the probability that the rays in the penumbra area irradiate the normal tissues at the periphery of the tumor area is reduced, and the treatment effect of the radiotherapy equipment is improved. Furthermore, because the attenuation coefficient of the second blade is smaller than that of the first blade, the manufacturing cost of the second blade is lower, and the manufacturing cost of the multi-blade collimator is further reduced.
The embodiment of the application also provides a treatment head, which can comprise: a radiation source and a multi-leaf collimator 000. The source may be an acceleration tube for accelerating electrons and targeting the output high energy beam. The multi-leaf collimator 000 may be the multi-leaf collimator 000 in the above embodiments.
The treatment head may further comprise: a support plate positioned between the radiation source and the multi-leaf collimator 000. The housing in the multi-leaf collimator 000 can be slidably attached to the support plate.
In an embodiment of the present application, the treatment head may further include: a primary collimator located between the radiation source and the support plate. The radioactive source can be fixedly connected with a primary collimator, and the primary collimator can be rotatably connected with the supporting plate.
The primary collimator is positioned below the radiation source and used for limiting the high-energy beam within a certain range to form a cone-shaped ray bundle. The primary collimator has, for example, a conical or pyramidal opening, so that the high-energy beam emitted by the radiation source can form a cone-shaped beam after passing through the conical or pyramidal opening.
A support plate is positioned below the primary collimator, the support plate having a radiation through hole, and the radiation through hole may communicate with a conical hole in the primary collimator.
A multi-leaf collimator 000 is located below the support plate for beam shaping the cone-shaped beam of radiation to obtain a first field region and a second field region that substantially conform to the shape of the tumor at the patient plane for irradiating the tumor.
In one embodiment, the treatment head may further include: and the driving component is positioned on the supporting plate and is used for driving the supporting plate and the multi-blade collimator 000 to rotate relative to the primary collimator, so that the treatment head can form different radiation fields.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.
Claims (11)
1. A multi-leaf collimator, comprising:
the blade assembly comprises a box body, an upper layer blade group and a lower layer blade group which are positioned in the box body and are stacked along a first direction;
the upper blade group includes: a plurality of first blades, each of the first blades moving in a direction perpendicular to the first direction so that the plurality of first blades form a first field region;
the lower blade group includes: a plurality of second blades, each of the second blades moving in a direction perpendicular to the first direction to form a second portal region of the plurality of second blades;
the orthographic projection of the second field area on a reference surface vertical to the first direction is positioned in the orthographic projection of the first field area on the reference surface; wherein the attenuation coefficient of the first blade is greater than the attenuation coefficient of the second blade.
2. The multi-leaf collimator of claim 1,
each of the first vanes includes a first end proximate the first field region and an opposite second end, and each of the first vanes includes a plurality of segments;
wherein the attenuation coefficient of each section in the first blade is the same, and the attenuation coefficients of the sections in the first blade are sequentially reduced along the direction from the second end to the first end.
3. A multi-leaf collimator according to claim 2,
each second vane comprises a third end close to the second portal area and a fourth opposite end, and each second vane comprises a plurality of sections;
wherein the attenuation coefficient of each section in the second blade is the same, and the attenuation coefficients of the sections in the second blade are sequentially reduced along the direction from the fourth end to the third end.
4. A multi-leaf collimator according to claim 3,
the maximum attenuation coefficient of each section in the second blade is less than or equal to the minimum attenuation coefficient of each section in the first blade.
5. A multi-leaf collimator according to claim 3,
the material of the first blade is the same as that of the second blade, and the thickness of the section with the large attenuation coefficient in the first direction is larger than that of the section with the small attenuation coefficient in the first direction in the first blade and the second blade;
or, in the first direction, the thickness of the first blade is the same as that of the second blade, and materials with different attenuation coefficients are used for the sections with different attenuation coefficients in the first blade and the second blade.
6. A multi-leaf collimator according to any one of claims 1 to 5,
the outline of the second radiation field area is the same as that of the first radiation field area.
7. The multi-leaf collimator of claim 6,
the contour size of the first radiation field area is the same as that of the target area to be irradiated;
the outline size of the second radiation field area is smaller than that of the first radiation field area.
8. A multi-leaf collimator according to any one of claims 1 to 5,
the cross sections of the first blades and the second blades in the direction perpendicular to the first direction are triangular, the first blades surround to form the first radiation field area, and the second blades surround to form the second radiation field area.
9. A multi-leaf collimator according to any one of claims 1 to 5,
the first blades are oppositely arranged pairwise, and each pair of first blades is opened and closed along a second direction perpendicular to the first direction; the plurality of second blades are arranged in a pairwise opposite mode, and each pair of second blades are opened and closed along a third direction perpendicular to the first direction.
10. The multi-leaf collimator of claim 9,
the second direction is parallel to the third direction, a first gap exists between any two adjacent first blades, a second gap exists between any two adjacent second blades, and the first gaps and the second gaps are arranged in a staggered mode in the first direction.
11. A therapy head, comprising: a radiation source and a multi-leaf collimator according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121422151.8U CN216222647U (en) | 2021-06-24 | 2021-06-24 | Multi-blade collimator and treatment head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121422151.8U CN216222647U (en) | 2021-06-24 | 2021-06-24 | Multi-blade collimator and treatment head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216222647U true CN216222647U (en) | 2022-04-08 |
Family
ID=80939486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121422151.8U Active CN216222647U (en) | 2021-06-24 | 2021-06-24 | Multi-blade collimator and treatment head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216222647U (en) |
-
2021
- 2021-06-24 CN CN202121422151.8U patent/CN216222647U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6105671B2 (en) | Gantry with a beam analyzer for use in particle beam therapy | |
| US11975216B2 (en) | Radiation treatment head and radiation treatment device | |
| US7816657B2 (en) | Particle therapy system | |
| US20100034357A1 (en) | Collimator | |
| EP2945700A2 (en) | An apparatus to deliver conformal radiotherapy using external beam cobalt 60 | |
| JPH0467875A (en) | Radiation irradiating field limiting device | |
| CN110124213B (en) | Multi-leaf collimator and radiotherapy device with same | |
| EP3831446A1 (en) | Device for concentrating ionising radiation fluence, which focuses electrons and x-ray photons and is adaptable | |
| CN110755762A (en) | Multi-blade collimator for therapeutic head of ray accelerator and tumor radiotherapy equipment | |
| WO2019205924A1 (en) | Radiation therapy head and radiation therapy apparatus | |
| CA1104728A (en) | Charged particle beam scanning apparatus | |
| CN216222647U (en) | Multi-blade collimator and treatment head | |
| CN208678191U (en) | Radiotherapy head and radiotherapy unit | |
| CN111714791B (en) | Radiotherapy device | |
| CN113368413B (en) | Blade group, linkage type multi-blade collimator and linkage method thereof | |
| CN211097110U (en) | Multi-blade collimator for therapeutic head of ray accelerator and tumor radiotherapy equipment | |
| CN114668986A (en) | Radiotherapy device, photon flash therapy system and ultrahigh-energy electronic flash therapy system | |
| CN109481853B (en) | Honeycomb collimator for X-ray pencil beam scanning intensity modulation treatment | |
| Svensson et al. | Beam characteristics and clinical possibilities of a new compact treatment unit design combining narrow pencil beam scanning and segmental multileaf collimation | |
| JPH0922800A (en) | Linear accelerator | |
| CN215961845U (en) | Radiotherapy apparatus | |
| CN214209191U (en) | Multi-blade collimator and treatment head | |
| US20230211180A1 (en) | Beam shaping apparatus | |
| CN220046869U (en) | Conformal treatment head and radiotherapy equipment | |
| CN113181565B (en) | High-energy electron beam multi-degree-of-freedom intensity modulated radiotherapy system based on longitudinal magnetic constraint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Multi leaf collimator and treatment head Effective date of registration: 20230720 Granted publication date: 20220408 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN CYBERMED SYSTEM Co.,Ltd. Registration number: Y2023420000310 |