CN108031015B - Multi-layer multi-blade collimator - Google Patents
Multi-layer multi-blade collimator Download PDFInfo
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- CN108031015B CN108031015B CN201711375973.3A CN201711375973A CN108031015B CN 108031015 B CN108031015 B CN 108031015B CN 201711375973 A CN201711375973 A CN 201711375973A CN 108031015 B CN108031015 B CN 108031015B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
- A61N5/1048—Monitoring, verifying, controlling systems and methods
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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
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Abstract
The invention discloses a multi-layer multi-blade collimator, which comprises at least three layers of inner-layer blades, middle-layer blades and outer-layer blades, wherein the inner-layer blades, the middle-layer blades and the outer-layer blades are arranged from a point light source to the rotating center of the point light source from near to far; two groups of blades on each layer of the inner layer blade, the middle layer blade and the outer layer blade are symmetrically distributed on two sides of a connecting line from a point light source to a point light source rotation center, and the two groups of blades on the same layer are the same in number; the two side walls of all the blades are parallel to rays emitted by the point light source, under the irradiation of the point light source, the projection on an isocenter plane is in a strip shape, and the isocenter plane is a plane which comprises a point light source rotation center and is vertical to a connecting line from the point light source to the point light source rotation center. The invention provides a collimator with three layers of blades, which overcomes the defect that the field boundary defined by the existing double-layer blade flasher is still not fine enough.
Description
Technical Field
The invention relates to a multi-layer multi-leaf collimator.
Background
Multi-leaf collimators (MLCs) are mechanically moving parts used to generate a conformal radiation field, commonly known as multileaf gratings, multileaf diaphragms.
From the advent of multi-leaf collimators to the present, the structural design of multi-leaf collimation has been improved and perfected. In order to adapt to various functions and purposes, multileaf collimators in various structural forms are successively introduced in various countries in the world. In view of the historical development, the multi-leaf collimator mainly surrounds the development of high-level functions such as improving the conformality, reducing the transmission penumbra, reducing the leakage ray, adapting to dynamic and dynamic wedge-shaped plates and the like. For example, the number of pairs of blades is reduced from small to large, and the width of the blades is reduced from large to small; the maximum irradiation field develops towards the large end and the small end as required; the focusing mode is from non-focusing to single focusing or double focusing; the adjacent blades are in concave-convex insertion from plane contact; the opposite side blades are from the non-midline to the midline and the travel is from small to large, etc. In addition, the rapid development of independent drive mechanism hardware enables the MLC system to have greatly increased functions, and gradually develops rapidly in the direction of meeting the clinical application requirements, reducing the manufacturing cost, facilitating processing, being simple and convenient to operate, being highly reliable and having low faults.
At present, a single-layer multi-leaf collimator and a double-layer multi-leaf collimator are mainly provided, and the double-layer multi-leaf collimator is developed from the single-layer multi-leaf collimator.
At present, there are two kinds of double-layer multi-blade collimators, one kind is a double-layer cross collimator, which includes two layers of blades, namely, an upper layer blade and a lower layer blade, each layer has two groups of blades, the two groups of blades are symmetrically distributed on two sides of a connecting line from a point light source to a light source rotation center, the two layers of blades are mutually perpendicular, the two groups of blades in the upper layer blade are the same in number, the two groups of blades in the lower layer blade are the same in number, and each group of blades in the upper layer blade and the lower layer blade can be the same or different. The projection widths of the two layers of blades are equal, the moving directions of the upper layer of blades and the lower layer of blades are mutually vertical to form a cross shape, and the upper layer of blades and the lower layer of blades are called as a double-layer cross collimator. The tumor boundary defined by the double lamina is much finer relative to the projected width of the single lamina. The other type is a double-layer I-shaped multi-blade collimator, which is different from the double-layer cross-shaped collimator in that: it features that the two layers of blades have the same moving direction and the same projection width and are staggered by half.
The double-layer ten-type multi-leaf collimator is an external-hanging collimator, only needs to meet the treatment space (about 300 mm) of the head tumor, and does not influence the treatment space (close to 500 mm) of the body tumor. The double-layer one-type multi-leaf collimator can replace a tungsten door in one direction by itself, and the treatment space is not reduced.
Perhaps a new emphasis method is deduced for the double leaf collimator.
If only one layer of blade is responsible for intensity modulation, the intensity modulation precision is really reduced.
In fact, the requirements on accuracy of emphasis and conformality are different. For the body tumor, the accuracy of the inverse computation emphasis plan is sufficient with the emphasis unit of 10 mm × 10 mm, but the portal boundary defined by projecting a 10 mm wide leaf is unsatisfactory. Similarly, while the accuracy is sufficient for a head tumor with a 5 mm × 5 mm intensity-enhancing unit, the field boundary defined by a 5 mm wide blade projected is still not fine enough.
Perhaps two versions of the double leaf collimator are based on such a determination. Although the double-layer multi-leaf collimator is based on reducing the processing difficulty, the double-layer multi-leaf collimator can bring a plurality of changes, and the value is worthy of deep excavation.
Disclosure of Invention
The invention aims to provide a multi-layer multi-leaf collimator with more than two leaves aiming at the defect that the field boundary defined by the leaves of the existing double-layer multi-leaf collimator is still not fine enough.
The technical scheme adopted by the invention for realizing the technical purpose is as follows: a multi-layer multi-blade collimator comprises at least three layers of inner-layer blades, middle-layer blades and outer-layer blades, and two groups of blades on each layer, wherein the inner-layer blades, the middle-layer blades and the outer-layer blades are arranged from a point light source to the rotating center of the point light source from near to far; two groups of blades on each layer of the inner layer blade, the middle layer blade and the outer layer blade are symmetrically distributed on two sides of a connecting line from a point light source to a point light source rotation center, and the two groups of blades on the same layer are the same in number; the two side walls of all the blades are parallel to rays emitted by the point light source, under the irradiation of the point light source, the projection on an isocenter plane is in a strip shape, and the isocenter plane is a plane which comprises a point light source rotation center and is vertical to a connecting line from the point light source to the point light source rotation center.
The invention provides a collimator with three layers of blades, which overcomes the defect that the field boundary defined by the existing double-layer blade flasher is still not fine enough.
Further, in the multi-layer multi-leaf collimator described above: under the irradiation of a point light source, the projection long side direction of the inner layer blade on the isocenter plane, the projection long side direction of the middle layer blade on the isocenter plane and the projection long side direction of the outer layer blade on the isocenter plane are parallel to each other.
Further, in the multi-layer multi-leaf collimator described above: under the irradiation of a point light source, the projection long side direction of the outer layer blade on the isocenter plane is perpendicular to the projection long side direction of the inner layer blade on the isocenter plane and the projection long side direction of the middle layer blade on the isocenter plane.
Further, in the multi-layer multi-leaf collimator described above: under the irradiation of a point light source, the projection long side direction of the middle layer blade on the isocenter plane is perpendicular to the projection long side direction of the inner layer blade on the isocenter plane and the projection long side direction of the outer layer blade on the isocenter plane.
Further, in the multi-layer multi-leaf collimator described above: the blade is flat and long, the upper end face and the lower end face of the blade are straight faces, and the end face of a plane which is perpendicular to the projection long-edge direction of the blade on the isocentric plane and faces to the projection long-edge direction of the blade and contains a point light source and a point light source rotating center is an arc face.
Further, in the multi-layer multi-leaf collimator described above: the inner layer blade and the middle layer blade are in flat arc shapes, the upper end face and the lower end face of each inner layer blade are cambered surfaces taking a point light source as a circle center, the end faces of planes which face to the rotating center of the point light source and are perpendicular to the long edge direction of the projection of the blades under the irradiation of the point light source are straight faces, and the straight faces are parallel to rays emitted by the point light source; the two groups of blades on the outer layer are flat and elongated, the upper end face and the lower end face of each blade are straight faces, and the end faces of planes which face to the rotating centers of the point light sources and are perpendicular to the long side direction of the projection of the isocentric plane are cambered surfaces under the irradiation of the point light sources.
Further, in the multi-layer multi-leaf collimator described above: under the irradiation of a point light source, the projection width of the inner layer blade on the isocenter plane is equal to the projection width of the middle layer blade on the isocenter plane, and the projection long-side edges of the inner layer blade and the middle layer blade are staggered by half of the projection width along the projection short-side direction of the blades; the projection width of the outer layer blade on the isocenter plane is half of that of the inner layer blade on the isocenter plane, and the projection long side line of the outer layer blade on the isocenter plane is staggered by half of the projection width of the outer layer blade (13) on the isocenter plane relative to the projection long side line of the inner layer blade on the isocenter plane and the projection long side line of the middle layer blade on the isocenter plane along the projection short side direction.
Further, in the multi-layer multi-leaf collimator described above: under the irradiation of a point light source, the projection width of the inner layer blade on the isocenter plane is equal to the projection width of the middle layer blade on the isocenter plane, and the projection of the inner layer blade on the isocenter plane and the projection long-side edge line of the middle layer blade on the isocenter plane are staggered by half of the projection width along the short-side direction; the projection width of the outer layer blade on the isocenter plane is half of the projection width of the inner layer blade on the isocenter plane.
Further, in the multi-layer multi-leaf collimator described above: under the irradiation of the point light source, the projection width of the middle layer blade on the isocenter plane is equal to the projection width of the outer layer blade on the isocenter plane.
Further, in the multi-layer multi-leaf collimator described above: under the irradiation of the point light source, the projection width of the inner layer blade on the isocenter plane is equal to the projection width of the middle layer blade on the isocenter plane.
Drawings
FIG. 1 is a diagram of the overall results of three layers of leaves of the collimator of the present invention.
FIG. 2 is a schematic view of a three-layer blade structure according to embodiment 1 of the present invention.
FIG. 3 is a schematic view of a three-layer blade structure according to embodiment 2 of the present invention.
FIG. 4 is a schematic view of a three-layer blade structure according to embodiment 3 of the present invention.
FIG. 5 is a schematic view of the shape and structure of a blade according to example 4 of the present invention.
FIG. 6 is a schematic view of the shape and structure of a blade according to example 5 of the present invention.
Fig. 7 is a schematic view of a projection shape according to embodiment 6 of the present invention.
Fig. 8 is a schematic view of the projection shape in embodiment 7 of the present invention.
Fig. 9 is a schematic view of a projection shape according to embodiment 8 of the present invention.
Fig. 10 is a schematic view of a projection shape according to embodiment 9 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention is a blade 1 having at least three layers, in this embodiment, three layers, and two groups of blades 1 are symmetrically distributed on two sides of a connecting line from a point light source 2 to a point light source rotation center 4. The blade 1 of each layer is composed of three layers of inner-layer blades 11, middle-layer blades 12 and outer-layer blades 13 from near to far on the connecting line from the point light source 2 to the point light source rotation center 4; the two groups of blades on each layer of the inner layer blade 11, the middle layer blade 12 and the outer layer blade 13 are the same in number; two side walls of the blade 1 are parallel to the ray emitted by the point light source 2, the projection 100 on the isocenter plane 3 is a long strip under the irradiation of the point light source 2, and the isocenter plane 3 is a plane which comprises a point light source rotation center 4 and is vertical to a connecting line from the point light source 2 to the point light source rotation center 4.
Different embodiments are formed by different blade shapes and different shapes and sizes of the projection of the blade 1 onto the isocentric plane 3 under illumination by the point light source 2.
Example 4, the shape of the blade in this example is shown in fig. 5, in this example, the blade 1 is a flat elongated shape, the upper and lower end faces thereof are straight faces, and the end face of a plane which includes the point light source 2 and the point light source rotation center 4 and is perpendicular to the projection long side direction of the blade 1 on the isocenter plane 3 under the irradiation of the point light source 2 is an arc face. The shape of the projection of the blade 1 on the isocentric plane 3 may be the same as the features of embodiments 1, 2, 3 above.
Example 5 blade 1 and blade 1 set as shown in fig. 6, in this example: the inner layer blade 11 and the middle layer blade 12 are in flat arc shapes, the upper end face and the lower end face of each inner layer blade are cambered surfaces taking the point light source 2 as the center of a circle, the end faces of planes which face to the rotating center 4 containing the point light source 2 and the point light source and are vertical to the long edge direction of the projection of the blades under the irradiation of the point light source 2 are straight faces, and the straight faces are parallel to rays emitted by the point light source 2; the outer blade 13 is flat and elongated, and has straight upper and lower end faces, and the end face of the plane including the point light source 2 and the point light source rotation center 4 and perpendicular to the long side direction of the projection 130 of the outer blade 13 on the isocentric plane 3 is an arc surface under the irradiation of the point light source 2.
In embodiment 6, the projection of the blade 1 is shown in fig. 7, and in this embodiment: under the irradiation of the point light source 2, the projection 110 width of the inner layer blade 11 on the isocentric plane 3 is equal to the projection 120 width of the middle layer blade 12 on the isocentric plane 3, and the projection long-side edges of the projection long-side edges are staggered by half of projection width along the projection short-side direction of the blades; the projection 130 width of the outer layer blade 13 on the isocenter plane 3 is half of the projection 110 width of the inner layer blade 11 on the isocenter plane 3, and the projection 130 long side line of the outer layer blade 130 on the isocenter plane 3 is shifted by half of the projection 130 width of the outer layer blade 130 on the isocenter plane 3 with respect to the projection 110 of the inner layer blade 11 on the isocenter plane 3 and the projection 120 long side line of the middle layer blade 120 on the isocenter plane 3 along the projection short side direction.
In example 7, the projection of the blade 1 is shown in fig. 8, and in this example: under the irradiation of the point light source 2, the projection 110 width of the inner layer blade 11 on the isocentric plane 3 is equal to the projection 120 width of the middle layer blade 12 on the isocentric plane 3, and the projection 110 of the inner layer blade 11 on the isocentric plane 3 and the long side edge line of the projection 120 of the middle layer blade 12 on the isocentric plane 3 are staggered by half of projection width along the short side direction; the width of the projection 130 of the outer layer blade 13 on the isocenter plane 3 is half of the width of the projection 110 of the inner layer blade 11 on the isocenter plane 3.
In embodiment 8, the projection of the blade 1 is as shown in fig. 9, and in this embodiment: under the irradiation of the point light source 2, the width of the projection 120 of the middle layer blade 12 on the isocenter plane 3 is equal to the width of the projection 130 of the outer layer blade 13 on the isocenter plane 3.
In example 9, the projection of the blade 1 is shown in fig. 10, and in this example: under the irradiation of the point light source 2, the width of the projection 110 of the inner blade 11 on the isocenter plane 3 is equal to the width of the projection 120 of the middle blade 12 on the isocenter plane 3.
Claims (10)
1. A multi-layer, multi-leaf collimator, characterized by: comprises at least three layers of inner layer blades (11), middle layer blades (12) and outer layer blades (13) from near to far on a connecting line from a point light source (2) to a point light source rotation center (4), and two groups of blades (1) on each layer; two groups of blades on each layer of the inner-layer blade (11), the middle-layer blade (12) and the outer-layer blade (13) are symmetrically distributed on two sides of a connecting line from the point light source (2) to the point light source rotating center (4), and the two groups of blades on the same layer are the same in number; two side walls of all the blades (1) are parallel to rays emitted by the point light source (2), under the irradiation of the point light source (2), a projection (100) on an isocenter plane (3) is in a long strip shape, and the isocenter plane (3) is a plane which comprises a point light source rotation center (4) and is perpendicular to a connecting line from the point light source (2) to the point light source rotation center (4).
2. The multi-layer, multi-leaf collimator of claim 1, wherein: under the irradiation of the point light source (2), the long side direction of the projection (110) of the inner layer blade (11) on the isocenter plane (3), the long side direction of the projection (120) of the middle layer blade (12) on the isocenter plane (3) and the long side direction of the projection (130) of the outer layer blade (13) on the isocenter plane (3) are parallel to each other.
3. The multi-layer, multi-leaf collimator of claim 1, wherein: under the irradiation of the point light source (2), the long side direction of the projection (130) of the outer layer blade (13) on the isocenter plane (3) is perpendicular to the long side direction of the projection (110) of the inner layer blade (11) on the isocenter plane (3) and the long side direction of the projection (120) of the middle layer blade (12) on the isocenter plane (3).
4. The multi-layer, multi-leaf collimator of claim 1, wherein: under the irradiation of the point light source (2), the long side direction of the projection (120) of the middle layer blade (12) on the isocenter plane (3) is perpendicular to the long side direction of the projection (110) of the inner layer blade (11) on the isocenter plane (3) and the long side direction of the projection (130) of the outer layer blade (13) on the isocenter plane (3).
5. The multi-layer multi-leaf collimator of claim 1, 2, 3 or 4, wherein: the blade (1) is flat and long, the upper end face and the lower end face of the blade are straight faces, the end face of the plane which is perpendicular to the projection long-edge direction of the blade (1) on the isocentric plane (3) and faces to the direction containing the point light source (2) and the point light source rotating center (4) and is irradiated by the point light source (2) is an arc face.
6. The multi-layer multi-leaf collimator of claim 1 or 4, wherein: the inner layer blade (11) and the middle layer blade (12) are in flat arc shapes, the upper end face and the lower end face of the inner layer blade are cambered surfaces taking the point light source (2) as the circle center, the end faces of planes which face to the rotating center (4) of the point light source (2) and are perpendicular to the long edge direction of the projection of the blades under the irradiation of the point light source (2) are straight surfaces, and the straight surfaces are parallel to rays emitted by the point light source (2); the outer layer blades (13) are flat and long, the upper end faces and the lower end faces of the outer layer blades are straight faces, and the end faces of the planes which face to the long-edge direction vertical to the projection (130) of the isocentric plane (3) and comprise the point light source (2) and the point light source rotating center (4) and are irradiated by the point light source (2) are cambered surfaces.
7. The multi-layer, multi-leaf collimator of claim 5, wherein: under the irradiation of a point light source (2), the width of a projection (110) of the inner layer blade (11) on the isocentric plane (3) is equal to the width of a projection (120) of the middle layer blade (12) on the isocentric plane (3), and the projection long-side edges of the projection long-side edges are staggered by half of the projection width along the projection short-side direction of the blades; the projection (130) width of the outer layer blade (13) on the isocenter plane (3) is half of the projection (110) width of the inner layer blade (11) on the isocenter plane (3), and the long side line of the projection (130) of the outer layer blade (13) on the isocenter plane (3) is staggered from the long side line of the projection (120) of the middle layer blade (12) on the isocenter plane (3) by half of the projection (130) width of the outer layer blade (13) on the isocenter plane (3) relative to the projection (110) of the inner layer blade (11) on the isocenter plane (3) along the projection short side direction.
8. The multi-layer, multi-leaf collimator of claim 5, wherein: under the irradiation of a point light source (2), the width of a projection (110) of the inner layer blade (11) on the isocentric plane (3) is equal to the width of a projection (120) of the middle layer blade (12) on the isocentric plane (3), and the projection (110) of the inner layer blade (11) on the isocentric plane (3) and the long-side edge line of the projection (120) of the middle layer blade (12) on the isocentric plane (3) are staggered by half of the projection width along the short-side direction; the width of the projection (130) of the outer layer blade (13) on the isocenter plane (3) is half of the width of the projection (110) of the inner layer blade (11) on the isocenter plane (3).
9. The multi-layer, multi-leaf collimator of claim 5, wherein: under the irradiation of the point light source (2), the width of a projection (120) of the middle layer blade (12) on the isocenter plane (3) is equal to the width of a projection (130) of the outer layer blade (13) on the isocenter plane (3).
10. The multi-layer, multi-leaf collimator of claim 6, wherein: under the irradiation of the point light source (2), the width of a projection (110) of the inner layer blade (11) on the isocenter plane (3) is equal to the width of a projection (120) of the middle layer blade (12) on the isocenter plane (3).
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2445754Y (en) * | 2000-09-07 | 2001-09-05 | 大连现代高技术发展有限公司 | Multi-vane grating diaphragm for tumor radiotherapy |
| CN101927061A (en) * | 2009-06-18 | 2010-12-29 | 东莞市益普生医疗设备发展有限公司 | Matrix intensity-modulated collimator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004041292A (en) * | 2002-07-09 | 2004-02-12 | Mitsubishi Electric Corp | Dose calculation method |
| JP4241518B2 (en) * | 2004-06-15 | 2009-03-18 | 株式会社Ｉｈｉ | Multi-leaf collimator |
| CN202802548U (en) * | 2012-06-19 | 2013-03-20 | 连卫东 | Grid field grid collimator |
| US10441814B2 (en) * | 2015-09-25 | 2019-10-15 | Varian Medical Systems International Ag | Method and apparatus to employ a multi-layer multi-leaf collimator when administering a radiation therapy treatment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2445754Y (en) * | 2000-09-07 | 2001-09-05 | 大连现代高技术发展有限公司 | Multi-vane grating diaphragm for tumor radiotherapy |
| CN101927061A (en) * | 2009-06-18 | 2010-12-29 | 东莞市益普生医疗设备发展有限公司 | Matrix intensity-modulated collimator |
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