JPH0767491B2 - Multi-leaf collimator - Google Patents
Multi-leaf collimatorInfo
- Publication number
- JPH0767491B2 JPH0767491B2 JP1144090A JP14409089A JPH0767491B2 JP H0767491 B2 JPH0767491 B2 JP H0767491B2 JP 1144090 A JP1144090 A JP 1144090A JP 14409089 A JP14409089 A JP 14409089A JP H0767491 B2 JPH0767491 B2 JP H0767491B2
- Authority
- JP
- Japan
- Prior art keywords
- collimator
- leaves
- leaf
- stages
- irradiation
- 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.)
- Expired - Lifetime
Links
Landscapes
- Radiation-Therapy Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、マルチリーフ・コリメータに関し、もう少
し詳しくいうと、荷電粒子線によりがん細胞を治療する
ためのマルチリーフ・コリメータに関するものである。TECHNICAL FIELD The present invention relates to a multileaf collimator, and more specifically to a multileaf collimator for treating cancer cells with a charged particle beam.
第４図は、例えば本出願人の先の出願（特開昭62−2884
95号）で示した従来のマルチリーフ・コリメータであ
り、鉛、鉄などで作られたいる四角柱状の複数個のリー
フ（１）でなる１対のリーフ群（11a）と（11b）が、互
いに同一平面内に対向して配置され、コリメータ（11）
を形成している。荷電粒子のビーム（２）はコリメータ
（11）の中央部を通過する。FIG. 4 shows, for example, the applicant's earlier application (Japanese Patent Laid-Open No. 62-2884).
95), a pair of leaf groups (11a) and (11b) consisting of a plurality of square columnar leaves (1) made of lead, iron, etc. Collimators (11) arranged facing each other in the same plane
Is formed. The beam (2) of charged particles passes through the central part of the collimator (11).
次に動作について説明する。図のように、複数個のリー
フ（１）を組み合わせて、ビーム（２）の形状を変え
て、がんなどの患部の形状に合わせることができる。リ
ーフ（１）相互間は、ビーム（２）が患部以外の場所に
漏れないように密着していなければならない。しかし、
反面、いろいろな形状の照射野を作るために、リーフ
（１）相互間はスムーズに滑ることが要求されることか
ら、リーフ（１）間の摩擦が問題になる。また、１回の
照射中に何回かの照射野を作る場合にはできるだけ早く
リーフ（１）を動かすことも必要である。Next, the operation will be described. As shown, a plurality of leaves (1) can be combined and the shape of the beam (2) can be changed to match the shape of the affected area such as cancer. The leaves (1) must be in close contact with each other so that the beam (2) does not leak to a place other than the affected part. But,
On the other hand, in order to create an irradiation field of various shapes, it is required that the leaves (1) slide smoothly between them, so that friction between the leaves (1) becomes a problem. In addition, when making several irradiation fields during one irradiation, it is also necessary to move the leaf (1) as soon as possible.
従来のマルチリーフ・コリメータは以上のように構成さ
れているので、リーフとリーフの間は密着していなけれ
ばならない反面、摩擦によってスムーズに照射野を作れ
ないという問題があった。Since the conventional multi-leaf collimator is configured as described above, there is a problem that the irradiation field cannot be made smoothly due to friction while the leaves have to be in close contact with each other.
この発明は、上記のような問題点を解消するためになさ
れたもので、リーフをスムーズに、かつ、スピーディに
動かすことができるマルチリーフ・コリメータを得るこ
とを目的とする。The present invention has been made to solve the above problems, and an object of the present invention is to obtain a multi-leaf collimator capable of moving leaves smoothly and speedily.
この発明の第１の発明は、複数個のリーフでなるリーフ
群の１対が同一平面内に間隔をおいて対向配置されてビ
ームに垂直な方向のビームの照射野を任意に制限するコ
リメータが、ビームの照射方向に間隔をおいて複数段配
置されているマルチリーフ・コリメータにおいて、複数
段配置されたコリメータは、それぞれのリーフ群を構成
するリーフの配列方向が同一で、かつ、リーフが幅方向
でビームの照射方向に部分的に重なっているものであ
る。A first aspect of the present invention is a collimator in which a pair of leaf groups each including a plurality of leaves are arranged to face each other at an interval in the same plane and arbitrarily limit an irradiation field of a beam in a direction perpendicular to the beam. In a multi-leaf collimator in which a plurality of stages are arranged at intervals in the beam irradiation direction, the collimators arranged in a plurality of stages have the same direction of arrangement of the leaves forming each leaf group, and the width of the leaves is the same. The direction of the beam partially overlaps the irradiation direction of the beam.
また、この発明の第２の発明は、複数個のリーフでなる
リーフ群の１対が同一平面内に間隔をおいて対向配置さ
れてビームに垂直な方向のビームの照射野を任意に制限
するコリメータが、ビームの照射方向に間隔をおいて複
数段配置されているマルチリーフ・コリメータにおい
て、複数段配置されコリメータは、それぞれビームの光
軸方向の共通な軸廻りに互いに回動可能に構成されてい
るものである。Further, according to a second aspect of the present invention, a pair of leaf groups composed of a plurality of leaves are arranged to face each other at an interval in the same plane to arbitrarily limit the irradiation field of the beam in the direction perpendicular to the beam. In a multi-leaf collimator in which a plurality of collimators are arranged at intervals in the beam irradiation direction, the plurality of collimators are arranged so that the collimators are rotatable about a common axis in the optical axis direction of the beam. It is what
この発明の第１の発明においては、コリメータのリーフ
群を構成するリーフ間に隙間があっても、このリーフ間
の隙間を通過するビームは、ビームの照射方向に間隔を
おいて配置されている他のコリメータのリーフにより患
者への到達が阻止される。そこで、リーフとリーフとの
間を密着することなく、微小間隙をもってリーフ群を構
成することができ、リーフを移動する際の摩擦がなく、
スムーズに、かつ、スピーディに照射野を形成すること
ができる。In the first aspect of the present invention, even if there is a gap between the leaves forming the leaf group of the collimator, the beams passing through the gap between the leaves are arranged at intervals in the beam irradiation direction. Other collimator leaves block access to the patient. Therefore, a leaf group can be formed with a minute gap without contact between the leaves, and there is no friction when moving the leaves.
The irradiation field can be formed smoothly and speedily.
また、この発明の第２の発明においては、コリメータを
ビームの照射方向の軸廻りに回動させることにより、コ
リメータのリーフ群を構成するリーフ間に隙間があって
も、このリーフ間の隙間を通過するビームは、ビームの
照射方向に間隔をおいて配置されている他のコリメータ
のリーフにより患者への到達が抑えられる。そこで、上
記第１の発明と同様に、リーフとリーフとの間を密着す
ることなく、微小間隙をもってリーフ群を構成すること
ができ、リーフを移動する際の摩擦がなく、スムーズ
に、かつ、スピーディに照射野を形成することができ
る。Further, in the second aspect of the present invention, by rotating the collimator about the axis in the beam irradiation direction, even if there is a gap between the leaves forming the leaf group of the collimator, the gap between the leaves is reduced. The passing beam is prevented from reaching the patient by the leaves of other collimators arranged at intervals in the irradiation direction of the beam. Therefore, as in the first aspect of the invention, a leaf group can be formed with a minute gap without closely contacting between the leaves, and there is no friction when moving the leaves, and smoothly, and The irradiation field can be formed speedily.
第１図はこの発明の一実施例を示し、第４図で示したと
同様の第１のコリメータ（11）に対して、コリメータ
（11）と間隙をおいて第２のコリメータ（13）が重ねて
配置されている。第２のコリメータ（13）は、複数個の
リーフ（３）からなる１対のリーフ群（13a），（13b）
からなっており、リーフ（３）はリーフ（１）に対して
幅の半分だけ重なって配置されている。FIG. 1 shows an embodiment of the present invention, in which a second collimator (13) is superposed on a first collimator (11) similar to that shown in FIG. Are arranged. The second collimator (13) is a pair of leaf groups (13a), (13b) consisting of a plurality of leaves (3).
The leaf (3) is arranged so as to overlap the leaf (1) by half the width.
以上の構成により、リーフ（１）とリーフ（３）が互い
に半分だけ重なりあっており、これらのリーフ（１），
（３）を制御して組み合わせることにより、平面での照
射野は従来例と同じものが得られる。また、リーフ
（１），（３）の幅は従来装置の２倍で良く、制御する
リーフの数も、変わらない。With the above configuration, the leaf (1) and the leaf (3) overlap each other by half, and these leaf (1),
By controlling and combining (3), the irradiation field on the plane can be the same as that of the conventional example. Further, the width of the leaves (1) and (3) may be twice as wide as that of the conventional device, and the number of leaves to be controlled does not change.
第２図は他の実施例を示し、第１のコリメータ（11）と
第２のコリメータ（13）が共通の軸（４）を中心に任意
角度、回転可能であり、上記と同様の効果があり、照射
野の形をなめらかにすることができる。FIG. 2 shows another embodiment, in which the first collimator (11) and the second collimator (13) can be rotated at an arbitrary angle about the common axis (4), and the same effect as above can be obtained. Yes, the shape of the irradiation field can be smoothed.
第３図はこの発明のマルチリーフ・コリメータを使った
荷電粒子線がん治療装置を示し、ビーム（２）は走査電
磁石（５）のそれぞれに90゜位相のずれた交流電流を印
加することにより、平坦な等線量分布をもつようにな
る。このビーム（２）はレンジシフタ（６）により、エ
ネルギーが変えられ、第１、第２のコリメータ（11），
（13）により、ビーム（２）に垂直方向の平面内で、所
望の照射野を形成して、治療台（７）上の患者（８）に
照射される。FIG. 3 shows a charged particle beam cancer treatment apparatus using the multi-leaf collimator of the present invention, in which the beam (2) is applied to the scanning electromagnets (5) by applying alternating currents with a 90 ° phase shift. , Has a flat isodose distribution. The energy of this beam (2) is changed by the range shifter (6), and the first and second collimators (11),
By (13), a desired irradiation field is formed in the plane perpendicular to the beam (2), and the patient (8) on the treatment table (7) is irradiated with the desired irradiation field.
なお、上記実施例では、２段のコリメータでなるものに
ついて述べたが、３段以上にしても同様の効果がある。It should be noted that, in the above-described embodiment, the case where the collimator has two stages is described, but the same effect can be obtained even if the number of stages is three or more.
以上のように、この発明の第１の発明によれば、複数段
配置されたコリメータは、それぞれのリーフ群を構成す
るリーフの配列方向が同一で、かつ、リーフが幅方向で
ビームの照射方向に部分的に重なっており、また第２の
発明においては、複数段配置されたコリメータは、それ
ぞれビームの光軸方向の共通な軸廻りに互いに回動可能
に構成されているので、リーフ間を拡げることができ、
リーフをスムーズに、スピーディに動かすことができ、
迅速に任意の照射野が得られる効果がある。As described above, according to the first aspect of the present invention, the collimators arranged in a plurality of stages have the same leaf array direction in each leaf group, and the leaves are in the width direction and in the beam irradiation direction. In the second invention, since the collimators arranged in a plurality of stages are configured to be rotatable with respect to each other about a common axis in the optical axis direction of the beam, the collimators are arranged between the leaves. Can be expanded,
You can move the leaf smoothly and speedily,
There is an effect that an arbitrary irradiation field can be quickly obtained.
第１図（ａ），（ｂ）はこの発明の一実施例の側断面図
と平面図、第２図（ａ），（ｂ）は他の実施例の側断面
図と平面図、第３図はこの発明のものの使用状態を示す
概略側面図、第４図（ａ），（ｂ）は従来のマルチリー
フ・コリメータの側断面図と平面図である。 （１），（３）……リーフ、（２）……ビーム、（11
a），（11b），（13a），（13b）……リーフ群、（1
1），（13）……第1,第２のコリメータ。 なお、各図中、同一符号は同一又は相当部分を示す。1 (a) and 1 (b) are side sectional views and a plan view of an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are a side sectional view and a plan view of another embodiment. FIG. 4 is a schematic side view showing a use state of the present invention, and FIGS. 4 (a) and 4 (b) are a side sectional view and a plan view of a conventional multileaf collimator. (1), (3) …… Leaf, (2) …… Beam, (11
a), (11b), (13a), (13b) …… Leaf group, (1
1), (13) ... First and second collimators. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (2)
一平面内に間隔をおいて対向配置されてビームに垂直な
方向の前記ビームの照射野を任意に制限するコリメータ
が、前記ビームの照射方向に間隔をおいて複数段配置さ
れているマルチリーフ・コリメータにおいて、複数段配
置された前記コリメータは、それぞれの前記リーフ群を
構成する前記リーフの配列方向が同一で、かつ、前記リ
ーフが幅方向で前記ビームの照射方向に部分的に重なっ
ていることを特徴とするマルチリーフ・コリメータ。1. A beam collimator, wherein a pair of leaf groups consisting of a plurality of leaves are arranged to face each other in the same plane with a space therebetween, and the collimator arbitrarily limits an irradiation field of the beam in a direction perpendicular to the beam. In a multi-leaf collimator arranged in a plurality of stages at intervals in the irradiation direction, the collimators arranged in a plurality of stages have the same array direction of the leaves constituting each of the leaf groups, and the leaves. Is partially overlapped in the irradiation direction of the beam in the width direction, a multileaf collimator.
一平面内に間隔をおいて対向配置されてビームに垂直な
方向の前記ビームの照射野を任意に制限するコリメータ
が、前記ビームの照射方向に間隔をおいて複数段配置さ
れているマルチリーフ・コリメータにおいて、複数段配
置された前記コリメータは、それぞれ前記ビームの光軸
方向の共通な軸廻りに互いに回動可能に構成されている
ことを特徴とするマルチリーフ・コリメータ。2. A collimator for arbitrarily limiting an irradiation field of the beam in a direction perpendicular to the beam, wherein a pair of leaf groups each composed of a plurality of leaves are arranged to face each other at an interval in the same plane. In a multi-leaf collimator arranged in a plurality of stages at intervals in the irradiation direction, the collimators arranged in a plurality of stages are configured to be rotatable with respect to each other about a common axis in the optical axis direction of the beam. A multi-leaf collimator characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1144090A JPH0767491B2 (en) | 1989-06-08 | 1989-06-08 | Multi-leaf collimator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1144090A JPH0767491B2 (en) | 1989-06-08 | 1989-06-08 | Multi-leaf collimator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH039767A JPH039767A (en) | 1991-01-17 |
| JPH0767491B2 true JPH0767491B2 (en) | 1995-07-26 |
Family
ID=15353988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1144090A Expired - Lifetime JPH0767491B2 (en) | 1989-06-08 | 1989-06-08 | Multi-leaf collimator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0767491B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7826596B2 (en) * | 2007-02-27 | 2010-11-02 | Kabushiki Kaisha Toshiba | Radiation therapy apparatus |
| WO2012027180A2 (en) * | 2010-08-23 | 2012-03-01 | Varian Medical Systems, Inc. | Multi level multileaf collimators |
| US10071263B1 (en) | 2014-03-25 | 2018-09-11 | Varian Medical Systems, Inc. | Pivoting multileaf collimator and method for large field coverage |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5591983A (en) * | 1995-06-30 | 1997-01-07 | Siemens Medical Systems, Inc. | Multiple layer multileaf collimator |
| JP2002210026A (en) * | 2001-01-19 | 2002-07-30 | Toshiba Corp | Radiotherapy equipment and beam limiting device for setting irradiation field of radiation |
| GB2403884B (en) * | 2003-07-08 | 2006-03-01 | Elekta Ab | Multi-leaf collimator |
| DE102011081038B4 (en) * | 2011-08-16 | 2015-06-18 | Siemens Aktiengesellschaft | multileaf collimator |
| KR101689953B1 (en) * | 2015-02-25 | 2016-12-26 | 동명대학교산학협력단 | A multifunctional compass with functions of Angle and length measurement |
| BR112019012061A2 (en) | 2016-12-13 | 2019-11-12 | Viewray Tech Inc | radiation therapy systems and methods |
| JP7005137B2 (en) * | 2016-12-20 | 2022-01-21 | キヤノンメディカルシステムズ株式会社 | Radiation therapy equipment |
| CN111053977B (en) * | 2019-12-20 | 2022-08-16 | 上海联影医疗科技股份有限公司 | Multi-leaf collimator and radiotherapy device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01206300A (en) * | 1988-02-12 | 1989-08-18 | Hitachi Medical Corp | Collimator for radiation irradiation device |
-
1989
- 1989-06-08 JP JP1144090A patent/JPH0767491B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7826596B2 (en) * | 2007-02-27 | 2010-11-02 | Kabushiki Kaisha Toshiba | Radiation therapy apparatus |
| WO2012027180A2 (en) * | 2010-08-23 | 2012-03-01 | Varian Medical Systems, Inc. | Multi level multileaf collimators |
| WO2012027180A3 (en) * | 2010-08-23 | 2012-05-10 | Varian Medical Systems, Inc. | Multi level multileaf collimators |
| US8637841B2 (en) | 2010-08-23 | 2014-01-28 | Varian Medical Systems, Inc. | Multi level multileaf collimators |
| US9082520B2 (en) | 2010-08-23 | 2015-07-14 | Varian Medical Systems, Inc. | Multi level multileaf collimators |
| US10071263B1 (en) | 2014-03-25 | 2018-09-11 | Varian Medical Systems, Inc. | Pivoting multileaf collimator and method for large field coverage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH039767A (en) | 1991-01-17 |
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