CN104700917A - Double-focusing multileaf collimator - Google Patents
Double-focusing multileaf collimator Download PDFInfo
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- CN104700917A CN104700917A CN201310652066.4A CN201310652066A CN104700917A CN 104700917 A CN104700917 A CN 104700917A CN 201310652066 A CN201310652066 A CN 201310652066A CN 104700917 A CN104700917 A CN 104700917A
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- blade
- diaphragm collimator
- double focusing
- collimating apparatus
- central projection
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
- G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
- G21K1/046—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers varying the contour of the field, e.g. multileaf collimators
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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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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- High Energy & Nuclear Physics (AREA)
- General Engineering & Computer Science (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
The invention provides a double-focusing multi-leaf collimator, belonging to radiotherapy equipment. The double-focusing multileaf collimator comprises a pair of block type collimators and a pair of leaf type collimators, wherein movements of the leaf type collimators are composed of integral-type multileaf collimator first-grade movements and split-type single-leaf collimator second-grade movements; projection thicknesses of leaves of the leaf-type collimators at isocenter are within 3 mm; projection widths of the leaves of the leaf-type collimators at the isocenter is within 10 mm; the bottom surfaces and the top surfaces of the leaves of the leaf-type collimators focus on a radiation source in a plane which is vertical to leaf movement direction; and the bottom surfaces and the top surfaces of the leaves focus on the radiation source in the plane which is parallel to the leaf movement direction. The double-focusing multileaf collimator provided by the invention can mitigate the load of a rotating arm of an accelerator and expands a distance from a treatment head to the isocenter at the same time.
Description
Technical field
The present invention relates to radiotherapy equipment, refer to a kind of double focusing multi-diaphragm collimator especially.
Background technology
Multi-diaphragm collimator (MLC) is main device conformal for launched field on accelerator, and the elementary cell forming multi-diaphragm collimator is blade, the highdensity tungalloy of material multiselect of blade.
Multi-diaphragm collimator, broadly in radiotherapy equipment, comprises the various treatments of intensity modulated radiation therapy (IMRT) and arc therapy for support.Conventional multi-diaphragm collimator comprises multiple bundles stop leaves of the single-stage being arranged to two relative rows or array.Each leaf in one row longitudinally can move relative to the leaf in row.In operation, each in each leaf is oriented to the part through the volume occupied by leaf of block radiation bundle.The integrated positioning of all leaves limits one or more hole, is not passed described hole by the radiation beam stopped, and hole is limited to the shape that isocenter point place points to the radiation beam of Treatment stations.
The many employings of existing accelerator three grades of collimator structures, three grades of collimator structures include two to block formula collimating apparatus and a pair leaf formula collimating apparatus, and weight ratio is comparatively large, heavier to the duty ratio of accelerator pivot arm.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of double focusing multi-diaphragm collimator, can alleviate the load of accelerator pivot arm, extends treatment head to isocentric distance simultaneously.
For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:
On the one hand, a kind of double focusing multi-diaphragm collimator is provided, described double focusing multi-diaphragm collimator includes pair of block formula collimating apparatus and a pair leaf formula collimating apparatus, the motion of described leaf formula collimating apparatus is moved by monoblock type multi-diaphragm collimator one-level and split type single blade second degree of motion forms, wherein, the blade of described leaf formula collimating apparatus is waiting central projection thickness in 3mm.
Further, the bottom surface of the blade of described leaf formula collimating apparatus and end face at the plane inner focusing vertical with blade movement direction in radioactive source, the bottom surface of described blade and end face at the plane inner focusing parallel with blade movement direction in radioactive source.
Further, the blade of described leaf formula collimating apparatus is waiting central projection width in 10mm.
Further, described leaf formula collimating apparatus includes and is multiplely waiting central projection width to be the irregular blade of 1.85-5mm.
Further, described leaf formula collimating apparatus include be arranged in blade slide wait central projection width be 10mm blade, wait central projection width be 3mm blade, waiting central projection width to be the blade of 5mm.
Further, described double focusing multi-diaphragm collimator includes the drive unit being connected, making described blade movement with described blade, the screw mandrel that described drive unit is included motor, is in transmission connection by screw mandrel link with described motor, described screw mandrel is arranged in described blade slide.
Further, describedly wait central projection width to be that the blade of 10mm and described screw mandrel are connected by screw, describedly wait central projection width to be that the blade of 3mm with 5mm is connected with described screw mandrel laser bonding.
Further, the adjacent blades of described leaf formula collimating apparatus is combined and interlobate sand permeation dosage can be made minimum.
Further, helium is full of in the treatment head of described double focusing multi-diaphragm collimator.
Further, the purification magnet eliminating the electronics existed in photon beam is provided with in the treatment head of described focusing multi-diaphragm collimator.
Embodiments of the invention have following beneficial effect:
In such scheme, double focusing multi-diaphragm collimator includes pair of block formula collimating apparatus and a pair leaf formula collimating apparatus, double focusing multi-diaphragm collimator adopts secondary collimator structure to replace three grades of collimator structures, alleviates the load of accelerator pivot arm, extends treatment head to isocentric distance simultaneously.In addition, the blade of leaf formula collimating apparatus is waiting central projection thickness in 3mm, meets clinical in little irradiation field and demand conformal more accurately.
Accompanying drawing explanation
Fig. 1 is the front view of the double focusing multi-diaphragm collimator of the embodiment of the present invention;
Fig. 2 is the side view of the double focusing multi-diaphragm collimator of the embodiment of the present invention.
Reference numeral
1. blade slide
2. width such as central projection such as grade is the blade of 10mm
3. width such as central projection such as grade is the blade of 5mm
4. width such as central projection such as grade is the blade of 3mm
5. screw mandrel link
6. micro motor
7. screw mandrel
Embodiment
For embodiments of the invention will be solved technical matters, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiments of the invention provide a kind of double focusing multi-diaphragm collimator, can alleviate the load of accelerator pivot arm, extend treatment head to isocentric distance simultaneously.
The embodiment provides a kind of double focusing multi-diaphragm collimator, described double focusing multi-diaphragm collimator includes pair of block formula collimating apparatus and a pair leaf formula collimating apparatus, the motion of described leaf formula collimating apparatus is moved by monoblock type multi-diaphragm collimator one-level and split type single blade second degree of motion forms, wherein, the blade of described leaf formula collimating apparatus is waiting central projection thickness in 3mm.
Three grades of collimating apparatuss comprise two to block formula collimating apparatus and a pair leaf formula collimating apparatus, double focusing multi-diaphragm collimator of the present invention includes pair of block formula collimating apparatus and a pair leaf formula collimating apparatus, secondary collimator structure is adopted to replace three grades of collimator structures, alleviate the load of accelerator pivot arm, extend treatment head to isocentric distance simultaneously.In addition, the blade of leaf formula collimating apparatus is waiting central projection thickness in 3mm, meets clinical in little irradiation field and demand conformal more accurately.
Further, the bottom surface of the blade of described leaf formula collimating apparatus and end face at the plane inner focusing vertical with blade movement direction in radioactive source, the bottom surface of described blade and end face in radioactive source, meet electronics and the public double-focusing properties of photon at the plane inner focusing parallel with blade movement direction.
Further, the blade of described leaf formula collimating apparatus is waiting central projection width in 10mm, and width of blade determines the geometry conformal degree of the Irregular field target region shape that MLC is formed, and width of blade is narrower, and geometry conformal degree is better.The width of Optimum Leaves in theory that Bortfeld etc. provide is 1.5 ~ 1.8mm.If reduce width further, the ratio of impeller clearance and width of blade can be made less, cause the proportion of sand permeation to increase.Consider difficulty and the cost of actual processing and manufacturing, usual width of blade meets and is waiting the wide clinical demand for 10mm of central projection.Particularly, double focusing multi-diaphragm collimator of the present invention can include 40 pairs of blades, and every sheet blade is 10mm waiting central projection wide.
Further, described leaf formula collimating apparatus can include and multiplely wait central projection width to be the irregular blade of 1.85-5mm.
Particularly, described leaf formula collimating apparatus can include be arranged in blade slide wait central projection width be 10mm blade, wait central projection width be 3mm blade, waiting central projection width to be the blade of 5mm.Further, described double focusing multi-diaphragm collimator includes the drive unit being connected, making described blade movement with described blade, the screw mandrel that described drive unit is included motor, is in transmission connection by screw mandrel link with described motor, described screw mandrel is arranged in described blade slide.Wherein, describedly wait central projection width to be that the blade of 10mm and described screw mandrel are connected by screw, describedly wait central projection width to be that the blade of 3mm with 5mm is connected with described screw mandrel laser bonding.
Further, the adjacent blades of described leaf formula collimating apparatus is combined and interlobate sand permeation dosage can be made minimum.
Further, be full of helium in the treatment head of described double focusing multi-diaphragm collimator, can scattering be reduced.Also be provided with the purification magnet eliminating the electronics existed in photon beam in the treatment head of described focusing multi-diaphragm collimator, the severe jamming of the electron scattering existed in photon beam can be eliminated, make photon beam single, ensure the degree of purity of line.
Below in conjunction with accompanying drawing and specific embodiment, double focusing multi-diaphragm collimator of the present invention is described in detail:
Double focusing multi-diaphragm collimator of the present invention should have all indexs of conventional collimator, comprises the accordance of MLC rotary middle spindle and cluster center axle; The accordance of the irradiation field that collimating apparatus is formed and light open country; The adjacent blades of collimating apparatus is combined and interlobate sand permeation dosage can be made minimum; Meet electronics and the public double-focusing properties of photon simultaneously, and minimum penumbra will be had, and blade is waiting central projection thickness in 3mm, meets clinical in little irradiation field and demand conformal more accurately.
Multi-focus double leaf collimating apparatus of the present invention is secondary collimator, only comprises pair of block formula collimating apparatus and a pair leaf formula collimating apparatus.Its middle period formula multi-diaphragm collimator is second degree of motion, be made up of the motion of monoblock type multi-diaphragm collimator one-level and split type single blade second degree of motion, first drive multi-diaphragm collimator mass motion to assigned address by motor during motion, then minitype motor driving individual blade moves to assigned address.
Double focusing multi-diaphragm collimator of the present invention design time mainly follow following some:
First be the design of MLC width of blade.Width of blade determines the geometry conformal degree of the Irregular field target region shape that MLC is formed, and width of blade is narrower, and geometry conformal degree is better.The width of Optimum Leaves in theory that Bortfeld etc. provide is 1.5 ~ 1.8mm.If reduce width further, the ratio of impeller clearance and width of blade can be made less, cause the proportion of sand permeation to increase.Consider difficulty and the cost of actual processing and manufacturing, usual width of blade meets and is waiting the wide clinical demand for 10mm of central projection.
Particularly, double focusing multi-diaphragm collimator of the present invention can possess 40 pairs of blades, and every sheet blade is 10mm waiting central projection width.Further, double focusing multi-diaphragm collimator can also possess and waiting central projection width to be the irregular blade of 1.85-5mm, in order to meet demand clinically.
Next is MLC blade interface and end face design.The design of MLC blade will meet following two necessary conditions: the bottom surface of blade and end face must at the plane inner focusing vertical with blade movement direction in radioactive sources, simultaneously bottom surface and the end face of blade at the plane inner focusing parallel with blade movement direction in radioactive source; Adjacent blades is combined, and interlobate sand permeation dosage must be made minimum.MLC end face (along MLC blade movement direction) design should make launched field penumbra little as far as possible, and when different field size, keep penumbra consistent, ideally vane end faces is all tangent with the diffusibleness of primary ray when any position.
The control of MLC blade again.As depicted in figs. 1 and 2, in one specific embodiment, leaf formula collimating apparatus include be arranged in blade slide 1 wait central projection width be 10mm blade 2, wait central projection width be 3mm blade 4, waiting central projection width to be the blade 3 of 5mm, double focusing multi-diaphragm collimator includes the drive unit being connected, making blade movement with blade, the screw mandrel 7 that described drive unit is included the micro motor 6 be fixed on fixed head, is in transmission connection by screw mandrel link 5 with micro motor 6, screw mandrel 7 is arranged in blade slide 1.Wherein, be that the blade 2 of 10mm is connected by screw with screw mandrel 7 waiting central projection width, wait central projection width be 3mm blade 4 with waiting central projection width to be that the blade 3 of 5mm is connected with screw mandrel 7 laser bonding.Operationally, blade 2 and rolling bearing roll friction transmission, blade 3,4 and steel disc sliding friction transmission.
Further, be full of helium in the treatment head of described double focusing multi-diaphragm collimator, can scattering be reduced.Also be provided with the purification magnet eliminating the electronics existed in photon beam in the treatment head of described focusing multi-diaphragm collimator, the severe jamming of the electron scattering existed in photon beam can be eliminated, make photon beam single, ensure the degree of purity of line.Double focusing multi-diaphragm collimator energy block electrons line of the present invention, conformal therapy, without the need to calimator and gear lead, eliminates electric wire scattering foil, greatly reduces x-ray and pollute.
Further, all right built-in automatic clapboard of double focusing multi-diaphragm collimator of the present invention, can carry out Conformal intensity-modulated radiotherapy like this, can realize stereotactic radiotherapy again.
Double focusing multi-diaphragm collimator of the present invention, reduces width of blade further, improves the conformal performance of MLC; Optimize vane end faces design, irradiation field penumbra width can be reduced; Double focusing multi-diaphragm collimator of the present invention is secondary collimator structure, can alleviate the load of accelerator pivot arm, extends treatment head to isocentric distance simultaneously.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a double focusing multi-diaphragm collimator, it is characterized in that, described double focusing multi-diaphragm collimator includes pair of block formula collimating apparatus and a pair leaf formula collimating apparatus, the motion of described leaf formula collimating apparatus is moved by monoblock type multi-diaphragm collimator one-level and split type single blade second degree of motion forms, wherein, the blade of described leaf formula collimating apparatus is waiting central projection thickness in 3mm.
2. double focusing multi-diaphragm collimator according to claim 1, it is characterized in that, the bottom surface of the blade of described leaf formula collimating apparatus and end face at the plane inner focusing vertical with blade movement direction in radioactive source, the bottom surface of described blade and end face at the plane inner focusing parallel with blade movement direction in radioactive source.
3. double focusing multi-diaphragm collimator according to claim 1, is characterized in that, the blade of described leaf formula collimating apparatus is waiting central projection width in 10mm.
4. double focusing multi-diaphragm collimator according to claim 3, is characterized in that, described leaf formula collimating apparatus includes and multiplely waiting central projection width to be the irregular blade of 1.85-5mm.
5. double focusing multi-diaphragm collimator according to claim 3, it is characterized in that, described leaf formula collimating apparatus include be arranged in blade slide wait central projection width be 10mm blade, wait central projection width be 3mm blade, waiting central projection width to be the blade of 5mm.
6. double focusing multi-diaphragm collimator according to claim 5, it is characterized in that, described double focusing multi-diaphragm collimator includes the drive unit being connected, making described blade movement with described blade, the screw mandrel that described drive unit is included motor, is in transmission connection by screw mandrel link with described motor, described screw mandrel is arranged in described blade slide.
7. double focusing multi-diaphragm collimator according to claim 6, it is characterized in that, describedly wait central projection width to be that the blade of 10mm and described screw mandrel are connected by screw, describedly wait central projection width to be that the blade of 3mm with 5mm is connected with described screw mandrel laser bonding.
8. double focusing multi-diaphragm collimator according to claim 1, is characterized in that, the adjacent blades of described leaf formula collimating apparatus is combined and interlobate sand permeation dosage can be made minimum.
9. double focusing multi-diaphragm collimator according to claim 1, is characterized in that, is full of helium in the treatment head of described double focusing multi-diaphragm collimator.
10. double focusing multi-diaphragm collimator according to claim 1, is characterized in that, is provided with the purification magnet eliminating the electronics existed in photon beam in the treatment head of described focusing multi-diaphragm collimator.
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| CN201310652066.4A CN104700917A (en) | 2013-12-05 | 2013-12-05 | Double-focusing multileaf collimator |
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| CN201310652066.4A CN104700917A (en) | 2013-12-05 | 2013-12-05 | Double-focusing multileaf collimator |
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Cited By (4)
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| CN105727449A (en) * | 2016-01-28 | 2016-07-06 | 上海联影医疗科技有限公司 | Collimator assembly, beam forming method, and medical linear accelerator |
| CN105749432A (en) * | 2016-01-13 | 2016-07-13 | 深圳市埃贝克科技有限公司 | Multi-leaf grating blade with magnetism |
| CN109893776A (en) * | 2017-12-07 | 2019-06-18 | 医科达有限公司 | For determining the method and system of radiotherapy harness shape |
| 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 |
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Application publication date: 20150610 |