CN110755762A - Multi-blade collimator for therapeutic head of ray accelerator and tumor radiotherapy equipment - Google Patents
Multi-blade collimator for therapeutic head of ray accelerator and tumor radiotherapy equipment Download PDFInfo
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- CN110755762A CN110755762A CN201911122528.5A CN201911122528A CN110755762A CN 110755762 A CN110755762 A CN 110755762A CN 201911122528 A CN201911122528 A CN 201911122528A CN 110755762 A CN110755762 A CN 110755762A
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- 206010028980 Neoplasm Diseases 0.000 title claims abstract description 29
- 238000001959 radiotherapy Methods 0.000 title claims abstract description 16
- 230000001225 therapeutic effect Effects 0.000 title description 5
- 230000005855 radiation Effects 0.000 claims abstract description 56
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000002560 therapeutic procedure Methods 0.000 description 2
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1077—Beam delivery systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/103—Treatment planning systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1042—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head
- A61N5/1045—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head using a multi-leaf collimator, e.g. for intensity modulated radiation therapy or IMRT
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N2005/1092—Details
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Abstract
The invention discloses a multi-blade collimator for a treatment head of a ray accelerator, which comprises a plurality of layers of box bodies, wherein the upper surface and the lower surface of each box body are respectively provided with an opening penetrating through the box body, all the openings are coaxially arranged and used for rays to pass through, each layer of box body is internally provided with a plurality of vertical blades, the plurality of blades are divided into two groups and are respectively arranged at the two ends of the box body, the front ends of the two groups of blades in the horizontal direction are opposite and are positioned at the openings, the rear end of each blade in the horizontal direction is respectively connected with a driver, the blades in each group are sequentially arranged, the side surfaces of the blades are close to each. The tumor edge is more effectively pressed close to, thus realizing better field conformal effect, improving field conformal resolution, reducing ray radiation leakage and improving field conversion efficiency. The invention also discloses tumor radiotherapy equipment comprising the multi-leaf collimator of the treatment head of the radiation accelerator.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to a multi-leaf collimator of a treatment head of a ray accelerator. In addition, the invention also relates to tumor radiotherapy equipment comprising the multi-leaf collimator of the treatment head of the radiation accelerator.
Background
The tumor radiotherapy equipment treats tumors through high-energy rays, has the advantages of high efficiency and accuracy, and the main component of the tumor radiotherapy equipment is a radiation accelerator treatment head which accelerates electrons to output high-energy rays through an accelerator to irradiate the high-energy rays at the tumor position for treatment. Meanwhile, the radiation also affects the body, and in order to prevent radiation leakage, a multi-leaf collimator is required to be arranged, an irradiation hole matched with the shape of the tumor is formed, the radiation passes through the irradiation hole and then irradiates on the tumor, and the radiation is prevented from irradiating positions except the tumor.
The multi-blade collimator is a ray collimator composed of a plurality of blades with strong ray shielding capability, and because each blade is provided with an independent driver, the automatic and accurate control of a computer is realized, and the multi-blade collimator has the characteristics of high efficiency and accurate radiation field shaping, and is an indispensable important device for modern accurate radiotherapy technology. According to the working characteristics of clinical use, the development of the multi-leaf collimator technology mainly focuses on improving the conformality, reducing the transmission penumbra, reducing the missing ray, adapting to dynamic irradiation and the like.
In order to improve the enveloping conformity of irregular fields, the method of reducing the thickness of the leaves and increasing the number of the leaves is generally adopted at present. This approach is difficult to machine due to the thin thickness of the tungsten alloy blades, and the structural strength becomes low, is easily deformed, and is limited by the micro-motor structural layout, and this structure is easily subject to radiation leakage at the gaps between adjacent blades.
Therefore, how to provide a multi-leaf collimator for a therapeutic head of a radiation accelerator, which can improve the conformal resolution of the radiation field, reduce the radiation leakage and improve the conversion efficiency of the radiation field, is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a multi-leaf collimator for a therapeutic head of a ray accelerator, which improves the conformal resolution of a field, reduces ray radiation leakage and improves the field conversion efficiency by arranging a multi-layer structure and arranging a right-angle chamfer at the front end of the side surface of a leaf. Another object of the present invention is to provide a tumor radiotherapy apparatus comprising the multi-leaf collimator of the radiation accelerator treatment head.
In order to solve the technical problem, the invention provides a multi-blade collimator for a treatment head of a ray accelerator, which comprises a plurality of layers of box bodies, wherein the upper surface and the lower surface of each box body are respectively provided with an opening penetrating through the box body, all the openings are coaxially arranged and used for rays to pass through, a plurality of vertical blades are arranged in each layer of box body, the plurality of blades are divided into two groups and are respectively arranged at the two ends of the box body, the front ends of the two groups of blades in the horizontal direction are opposite and are positioned at the openings, the rear end of each blade in the horizontal direction is independently connected with a driver, the blades in each group are sequentially arranged and are close to each other in side surfaces, and the edge of the front end of the side surface.
Preferably, the blade lifting device comprises an upper layer box body and a lower layer box body, wherein the gaps of the adjacent upper layer blades in the upper layer box body and the gaps of the adjacent lower layer blades in the lower layer box body are arranged in a staggered mode.
Preferably, the side surface of the adjacent upper blade is of a concave-convex mosaic structure, and the side surface of the lower blade is of a plane structure.
Preferably, the number of the lower blades is larger than that of the upper blades.
Preferably, the two side surfaces of the lower blade and the upper blade are both folded upwards, the lower focusing point of the side surface of all the lower blade is located at a ray beam source point, and the upper focusing point of the side surface of all the upper blade is located above the lower focusing point and coincides with the beam direction.
Preferably, a moving gap of 0.1mm to 0.2mm is arranged between adjacent blades.
Preferably, the chamfer width is one quarter of the blade width.
Preferably, the driver includes a motor and a lead screw transmission.
Preferably, the upper tank and the lower tank are integrally manufactured and molded.
The invention provides tumor radiotherapy equipment which comprises a multi-leaf collimator of a treatment head of a radiation accelerator, wherein the multi-leaf collimator of the treatment head of the radiation accelerator is any one of the multi-leaf collimators of the treatment head of the radiation accelerator.
The invention provides a multi-blade collimator for a treatment head of a ray accelerator, which comprises a plurality of layers of box bodies, wherein the upper surface and the lower surface of each box body are respectively provided with an opening penetrating through the box body, all the openings are coaxially arranged and used for rays to pass through, each layer of box body is internally provided with a plurality of vertical blades, the plurality of blades are divided into two groups and respectively arranged at the two ends of the box body, the front ends of the two groups of blades in the horizontal direction are opposite and positioned at the openings, the rear end of each blade in the horizontal direction is independently connected with a driver, each group of blades are sequentially arranged, the side surfaces of each group of blades are close.
In the treatment process, the motion of driver drive blade forms the irradiation hole that matches with the tumour shape, and the ray throws on the tumour through shining behind the hole, through setting up multilayer structure to set up right angle chamfer at blade side front end, compare in current right angle terminal surface, effectively press close to the tumour edge more, thereby realize better shape-adapted effect in the field of penetrating, thereby improve shape-adapted resolution ratio in the field of penetrating, reduce the ray radiation and leak, improve field of penetrating conversion efficiency.
The invention also provides a tumor radiotherapy device comprising the multi-leaf collimator of the radiation accelerator treatment head, and the tumor radiotherapy device also has the same technical effects due to the technical effects of the multi-leaf collimator of the radiation accelerator treatment head, and the details are not described herein.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator;
FIG. 2 is a schematic front view of one embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator;
FIG. 3 is a schematic diagram of a combination of leaves of an embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator according to the present invention in comparison with the prior art;
FIG. 4 is a schematic side view of one embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator;
FIG. 5 is a partial enlarged view of the upper leaves of one embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator provided by the present invention;
fig. 6 is a schematic installation diagram of one embodiment of a multi-leaf collimator of a treatment head of a radiation accelerator provided by the invention.
Detailed Description
The core of the invention is to provide a multi-leaf collimator for a therapeutic head of a ray accelerator, which improves the conformal resolution of a radiation field, reduces the radiation leakage of rays and improves the conversion efficiency of the radiation field by arranging a multi-layer structure and arranging a right-angle chamfer at the front end of the side surface of a leaf. Another core of the invention is to provide a tumor radiotherapy device comprising the multi-leaf collimator of the radiation accelerator treatment head.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of an embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator according to the present invention; FIG. 2 is a schematic front view of one embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator; FIG. 3 is a schematic diagram of a combination of leaves of an embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator according to the present invention in comparison with the prior art; FIG. 4 is a schematic side view of one embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator; FIG. 5 is a partial enlarged view of the upper leaves of one embodiment of a multi-leaf collimator for a treatment head of a radiation accelerator provided by the present invention; fig. 6 is a schematic installation diagram of one embodiment of a multi-leaf collimator of a treatment head of a radiation accelerator provided by the invention.
The invention provides a multi-blade collimator of a treatment head of a ray accelerator, which is arranged below the treatment head and comprises a plurality of layers of boxes, wherein the plurality of layers of boxes are sequentially stacked from top to bottom, the uppermost part of each box is provided with a beam source point of a ray, the upper surface and the lower surface of each box are respectively provided with an opening penetrating through the box, all the openings are coaxially arranged with the beam, and the ray can sequentially penetrate through each opening to irradiate a tumor.
All be provided with a plurality of vertical blades in every layer of box, then the blade side is on a parallel with the axis direction of ray irradiation, box and blade all extend along the horizontal direction, the opening is located the box middle part, a plurality of blades fall into two sets of both ends that set up respectively in the horizontal direction of box, the front end of two sets of blade horizontal directions is relative and is located the opening part, the rear end of every blade horizontal direction all is connected with the driver alone, each blade in every group is arranged in proper order and the side is pressed close to each other, the front end edge of every blade side is provided with right angle chamfer. Each vane can stop at any position in the motion range, and the stop positions of the vanes are combined to form different holes, one or more, through which the beam passes, so that the dose distribution with the same shape as the holes and changing according to fixed proportion can be formed on the plane of the patient.
In the treatment process, each driver drives the blades to move to form an irradiation hole matched with the shape of the tumor, rays are projected onto the tumor after passing through the irradiation hole, and compared with the existing right-angle end face, as shown in fig. 2, the left side is the blade structure of the specific implementation mode of the invention, and the right side is the blade structure in the prior art, so that the blade structure is more effectively close to the edge of the tumor, better field conformal effect is realized, field conformal resolution is improved, ray radiation leakage is reduced, and field conversion efficiency is improved.
In the multi-blade collimator for the treatment head of the radiation accelerator provided by the embodiment of the invention, the number of layers of the box body can be adjusted according to the situation, specifically, two layers of box bodies can be arranged, namely an upper layer box body 1 and a lower layer box body 2, the blades in the upper layer box body 1 are upper layer blades 3, the blades in the lower layer box body 2 are lower layer blades 4, the gap between the adjacent upper layer blades 3 and the gap between the adjacent lower layer blades 4 are arranged in a staggered mode, and the structure enables the beam passing through the gap between the upper layer blades 3 to pass through the whole height of the lower layer blades 4 to reach the plane of a patient, so that the dose leaking to the plane of the patient is greatly reduced. Upper blade 3 is through automatic following sheltering from lower floor's blade 4, avoids the ray that the relative inter-blade gap of lower floor caused to directly reveal and wear out, can further improve the shape degree of hole and tumour simultaneously, reaches half of single blade width.
Furthermore, the side surfaces of the adjacent upper-layer blades 3 are of concave-convex mosaic structures, so that rays are prevented from directly penetrating out under any condition, and the side surfaces of the lower-layer blades 4 are of planar structures, so that the design and the manufacture are simplified, and the blade projection accuracy is improved. The concave-convex mosaic structure of the upper blade 3 effectively attenuates rays passing through gaps of adjacent blades, and is preferably designed into a symmetrical concave-convex structure and can be expanded into an asymmetrical concave-convex structure. Specifically, the quantity of lower floor's blade 4 is greater than the quantity of upper blade 3, effectively reduces the radiation and reveals, is provided with 0.1mm to 0.2 mm's movement gap between the adjacent blade, and the chamfer width is quarter blade width, and two-layer blade combination still can form conventional rectangle and square radiation field, can not receive the chamfer influence. The size and arrangement of the components can be adjusted according to the situation and are within the protection scope of the invention.
In the multi-leaf collimator for the treatment head of the radiation accelerator provided by the specific embodiment of the invention, the two side surfaces of the lower-layer leaf 4 and the upper-layer leaf 3 are folded upwards, the cross section is trapezoidal, the lower-layer focusing point of the side surface of all the lower-layer leaves 4 is positioned at the source point of a radiation beam, and the upper-layer focusing point of the side surface of all the upper-layer leaves 3 is positioned above the lower-layer focusing point and is superposed with the beam direction, so that the penumbra is improved and reduced, and the dosage precision of the edge of the radiation field is.
Wherein, the driver includes motor 5 and screw drive mechanism 6, installs in the box, has the high advantage of control accuracy.
On the basis of the multi-blade collimator of the treatment head of the ray accelerator provided by each specific embodiment, the upper layer box body 1 and the lower layer box body 2 are integrally manufactured and molded, and the upper layer box body 2 and the lower layer box body 2 on the same side are fixed in position and do not move relatively; the movable structure can be designed into a detachable or movable structure in a maintenance state according to the maintenance requirements of the equipment. The box bodies on the two sides are connected through side plates on the two sides, and openings are formed through opposite intervals on the two sides.
In addition to the multi-leaf collimator for a therapy head of a radiation accelerator, the present invention provides a tumor radiotherapy device including the multi-leaf collimator for a therapy head of a radiation accelerator, and the structure of other parts of the tumor radiotherapy device is referred to the prior art and will not be described herein again.
The multi-leaf collimator of the treatment head of the radiation accelerator and the tumor radiotherapy equipment provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The multi-blade collimator for the treatment head of the ray accelerator is characterized by comprising a plurality of layers of boxes, wherein openings penetrating through the boxes are formed in the upper surface and the lower surface of each box, all the openings are coaxially formed and used for rays to pass through, a plurality of vertical blades are arranged in each layer of box, the plurality of blades are divided into two groups and are respectively arranged at the two ends of each box, the front ends of the two groups of blades in the horizontal direction are opposite and are located at the openings, the rear end of each blade in the horizontal direction is independently connected with a driver, the blades in each group are sequentially arranged, the side surfaces of the blades are close to each other, and the edge of the front end of the side surface of each blade is provided with a right-.
2. A multi-leaf collimator for a treatment head of a ray accelerator according to claim 1, characterized by comprising an upper box (1) and a lower box (2), wherein the gaps of the adjacent upper leaves (3) in the upper box (1) are staggered with the gaps of the adjacent lower leaves (4) in the lower box (2).
3. The multi-leaf collimator for a treatment head of a ray accelerator according to claim 2, characterized in that the side surfaces of the adjacent upper leaves (3) are of a concave-convex mosaic structure, and the side surfaces of the lower leaves (4) are of a plane structure.
4. A multi-leaf collimator for a treatment head of a radiation accelerator according to claim 3, characterized in that the number of leaves (4) of the lower layer is greater than the number of leaves (3) of the upper layer.
5. A multi-leaf collimator for a treatment head of a radiation accelerator according to claim 4, characterized in that the two sides of the lower leaf (4) and the upper leaf (3) are folded upwards, the lower focal point of the side of all the lower leaf (4) is located at the source point of the radiation beam, and the upper focal point of the side of all the upper leaf (3) is located above the lower focal point and coincides with the beam direction.
6. A multi-leaf collimator for a treatment head of a radiation accelerator according to claim 2 in which a moving slit of 0.1mm to 0.2mm is provided between adjacent leaves.
7. A multi-leaf collimator for a treatment head of a radiation accelerator according to claim 2 in which the chamfer width is one quarter of the leaf width.
8. Multi-leaf collimator for a treatment head of a radiation accelerator according to claim 2, characterized in that the driver comprises a motor (5) and a lead screw drive (6).
9. Multi-leaf collimator for a treatment head of a radiation accelerator according to any one of claims 2 to 8, characterized in that the upper (1) and lower (2) housings are manufactured in one piece.
10. A tumor radiotherapy apparatus comprising a multi-leaf collimator of a radiation accelerator treatment head, wherein the multi-leaf collimator is the multi-leaf collimator of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911122528.5A CN110755762A (en) | 2019-11-15 | 2019-11-15 | Multi-blade collimator for therapeutic head of ray accelerator and tumor radiotherapy equipment |
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| CN201911122528.5A CN110755762A (en) | 2019-11-15 | 2019-11-15 | Multi-blade collimator for therapeutic head of ray accelerator and tumor radiotherapy equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111408065A (en) * | 2020-03-18 | 2020-07-14 | 上海联影医疗科技有限公司 | Multi-leaf collimator, double-layer multi-leaf collimator and medical equipment |
| CN113082552A (en) * | 2020-04-15 | 2021-07-09 | 上海联影医疗科技股份有限公司 | System and method for adjusting multi-leaf collimator |
| WO2021245109A1 (en) * | 2020-06-02 | 2021-12-09 | Elekta Limited | Beam shaping apparatus |
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| WO2021245109A1 (en) * | 2020-06-02 | 2021-12-09 | Elekta Limited | Beam shaping apparatus |
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