JP4289955B2 - アイソセンタ方式の粒子ビーム誘導用等速ガントリー装置およびその設計方法 - Google Patents
アイソセンタ方式の粒子ビーム誘導用等速ガントリー装置およびその設計方法 Download PDFInfo
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Description
特に重要なのは、磁石が、ガントリー装置の水平長手軸に関して、無負荷状態において変位した回転軸を中心に円形軌道上を移動できる特徴であり、これにより、磁石をガントリー装置の水平長手軸に関して無負荷の状態で変位する回転軸を中心に円形軌道上を動かすことができる。これを目的として、本発明に係る磁石は、水平長手軸または回転軸に対し垂直またはわずかに傾斜した面内にある円形軌道上を誘導される。その円形軌道、特にそれらの断面の選択に関しては構造部品の適切で緻密な寸法設計を採用することにより、構造変形分析を利用しコンピューター支援設計段階において設定される。
一次構造物18は、ケーブル回転/巻取装置29を備え、図3にその概略のみを示している。
当初、可能な限り剛性が高くなる先行技術の一般に周知の基本原則に従いガントリー装置を設計するつもりであった。しかしながら、模擬計算により、ガントリー装置10全体の死荷重が増えるため、三つの磁石36、38、40の鉛直方向への変位量V1、V2、V3を必要に応じて減らすことができないことが分かった。
12 粒子ビーム
14 人、患者
15 治療台
16 水平長手軸
18 一次構造物
20 横材
20’ 垂直材
20’’ 斜め材
22、22’ 表面中心点
24、24’ 一次構造物端部
26、26’ 部材サポートリング
28、28’ 固定軸受け台
29 ケーブル回転/巻取装置
30 二次構造物
32、32’ 部材
34 連結部品
36 第一の磁石
38 第二の磁石
40 第三の磁石
42 矢印
44 患者空間
46 (治療)照準点
48 遮蔽ブロック
50、50’ 支材
52 回転軸
D1、D2、D3 距離
V1、V2、V3 変位量
Claims (23)
- アイソセンタ方式の粒子ビーム(12)誘導用ガントリー装置であって、
水平長手軸(16)を中心に回転可能であり、磁石(36、38、40)により象徴されるビーム光学システムを備えており、
前記磁石(36、38、40)は、粒子ビーム加速器により軸方向に射出された粒子ビーム(12)を放射状および前記水平長手軸(16)に関して垂直方向に偏向し、
ほぼ回転対称の一次構造物(18)と、前記一次構造物(18)により支持され前記磁石(36、38、40)を保持する二次構造物(30)とを備え、
前記二次構造物(30)は、前記磁石(36、38、40)の自重による鉛直方向への変位量が、前記ガントリー装置(10)の全回転位置角度において本質的に等しく(等速と)なるように設定された剛性を有し、
前記磁石(36、38、40)が、前記ガントリー装置(10)の前記水平長手軸(16)に関して、無負荷状態において変位した回転軸(52)を中心に円形軌道上を移動できることを特徴とするガントリー装置。 - 前記二次構造物(30)は、前記磁石(36、38、40)の自重による鉛直方向への変位量が、前記ガントリー装置(10)の全回転位置角度において等しくなるように設定された剛性を有することを特徴とする請求項1に記載のガントリー装置。
- イオン/陽子ビームと前記の負荷により変位した回転軸(52)との交点を照射照準点とし、前記回転軸(52)は、最小誤差平方の方法を用いて、無負荷状態における前記ガントリー装置(10)の前記水平長手軸(16)に対する前記磁石(36、38、40)の負荷による変位量から求められることを特徴とする請求項1又は2に記載のガントリー装置。
- 前記一次構造物(18)が、実質的に横材および垂直材(20、20’)と斜め材(20’’)とから成る立体的骨組構造体として設計されていることを特徴とする請求項1から3のいずれかに記載のガントリー装置。
- 前記斜め材(20’’)のいくつかが、前記一次構造物(18)の矩形枠を強化し、それらの表面中心点(22、22’)で交わることを特徴とする請求項4に記載のガントリー装置。
- 前記一次構造物(18)がその端部(24、24’)に、固定軸受け台(28、28’)と相互作用する二つの、特に箱型の、部材サポートリング(26、26’)を備えていることを特徴とする請求項1から5のいずれかに記載のガントリー装置。
- 前記二つの固定軸受け台(28、28’)の一方(28)が、浮動軸受けとして設計され、前記二つの固定軸受け台(28、28’)の他方(28’)が、固定軸受けとして設計されていることを特徴とする請求項6に記載のガントリー装置。
- 前記磁石(36、38、40)を保持し前記一次構造物(18)に支持された前記二次構造物(30)が、前記一次構造物(18)に比べて剛性が低くなるように設計されていることを特徴とする請求項1から7のいずれかに記載のガントリー装置。
- 前記磁石(36、38、40)を保持し前記一次構造物(18)に支持された前記二次構造物(30)が、前記磁石(36、38、40)の方位角方向への傾動に対してねじり剛性を有するように前記一次構造物(18)に取り付けられていることを特徴とする請求項1から8のいずれかに記載のガントリー装置。
- 前記一次構造物(18)に支持された前記二次構造物(30)が、少なくとも一つ、特に三つの磁石(36、38、40)を有することを特徴とする請求項1から9のいずれかに記載のガントリー装置。
- 第一の磁石(36)が、前記の軸方向に射出された粒子ビーム(12)を受け前記水平長手軸(16)から偏向させるように、実質的に、前記粒子加速器に面し前記水平長手軸(16)上に配置されていることを特徴とする請求項1から10のいずれかに記載のガントリー装置。
- 前記第一の磁石(36)が、前記の軸方向に射出された粒子ビーム(12)を、前記水平長手軸(16)からおよそ30°〜60°、特に約45°の角度で偏向することを特徴とする請求項11に記載のガントリー装置。
- 前記第一の磁石(36)が、長部材(32’)上、前記水平長手軸(16)上で前記一次構造物(18)に片持式に取り付けられていることを特徴とする請求項11または12に記載のガントリー装置。
- 第二の磁石(38)が、前記第一の磁石(36)から来る前記粒子ビーム(12)を受け、前記水平長手軸(16)に対して平行に偏向させるように設けられており、支材(50)により前記第一の磁石に連結されていることを特徴とする請求項10から13のいずれかに記載のガントリー装置。
- 前記第二の磁石(38)が、前記第一の磁石(36)により偏向された前記粒子ビーム(12)を前記水平長手軸(16)に対して平行にもどすように、およそ30°〜60°、特に約45°の角度で偏向することを特徴とする請求項14に記載のガントリー装置。
- 第三の磁石(40)が前記第二の磁石(38)から来る前記粒子ビーム(12)を受けるように設けられており、前記第三の磁石(40)は、放射状および前記水平長手軸(16)に関して垂直方向に前記粒子ビーム(12)を偏向し、また、支材(50)により前記第二の磁石に連結されていることを特徴とする請求項14又は15に記載のガントリー装置。
- 前記第三の磁石(40)が、およそ60°〜120°、特に約90°の角度で、放射状および前記水平長手軸(16)に対し実質的に垂直方向に、前記第二の磁石(38)から来る前記粒子ビーム(12)を偏向することを特徴とする請求項16に記載のガントリー装置。
- 前記磁石(36、38、40)が陽子の粒子ビーム(12)を受け偏向するように設計されていることを特徴とする請求項1から17のいずれかに記載のガントリー装置。
- 前記磁石(36、38、40)がイオンの粒子ビーム(12)を受け偏向するように設計されていることを特徴とする請求項1から17のいずれかに記載のガントリー装置。
- 粒子ビーム誘導素子が前記磁石(36、38、40)の間に配置されていることを特徴とする請求項1から19のいずれかに記載のガントリー装置。
- 前記第二および第三の磁石が一体部材に形成されることを特徴とする請求項16から20のいずれかに記載のガントリー装置。
- 前記請求項1−21のいずれか1項に記載のアイソセンタ方式の粒子ビーム(12)誘導用ガントリー装置の設計方法であって、無負荷状態において前記ガントリー装置(10)の水平長手軸(16)に関して変位する回転軸(52)を中心として円形軌道上を移動する磁石(36、38、40)を使用し、実質的に回転対称の一次構造物(18)の剛性を、磁石(36、38、40)の自重による鉛直方向への変位量が、前記ガントリー装置(10)の全回転位置角度において実質的に等しく、好ましくは厳密に等しくなるように設定するガントリー装置の設計方法。
- 最小誤差平方の方法により、無負荷状態における前記ガントリー装置(10)の水平長手軸(16)に対し、前記の負荷により低くなる理論上の回転軸(52)を求め、前記粒子ビームと前記の負荷により変位した理論上の回転軸(52)との「交点」を照射照準点として定義することを特徴とする請求項22に記載の設計方法。
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DE10241178A DE10241178B4 (de) | 2002-09-05 | 2002-09-05 | Isokinetische Gantry-Anordnung zur isozentrischen Führung eines Teilchenstrahls und Verfahren zu deren Auslegung |
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EP (1) | EP1396278B1 (ja) |
JP (1) | JP4289955B2 (ja) |
AT (1) | ATE329654T1 (ja) |
DE (2) | DE10241178B4 (ja) |
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