JP2017189285A - 位置決め装置および位置決め方法 - Google Patents
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Abstract
【解決手段】 制御部40は、機能的構成として、フラットパネルディテクタ21a〜21dのうち、選択された撮像系の2個で検出された画像情報を取得する画像取得部41と、ネットワーク17を介して取得した3次元CT画像データに対して仮想的に透視投影を行うことにより異なる2方向のDRRを作成するDRR作成部42と、2つの撮像系から得たX線透視画像にCT画像を位置合わせする位置合わせ部43と、画像間のずれ量から天板31の移動量を算出する移動量算出部44とを備える。位置合わせ部43は、DRRとX線透視画像の一致を評価する評価関数が最大となるように、透視投影の回転および平行移動に関するパラメータを最適化する多次元最適化部45と1次元最適化部46とを備える。
【選択図】 図2
Description
10 X線管制御部
11 X線管
15 表示部
16 入力部
17 ネットワーク
21 フラットパネルディテクタ
30 治療台
31 天板
32 天板移動機構
40 制御部
41 画像取得部
42 DRR作成部
43 位置合わせ部
44 移動量算出部
45 多次元最適化部
46 1次元最適化部
Claims (7)
- 治療台上の被検体の患部に向けて治療ビームを照射する放射線治療を行うときに、前記被検体の位置決めを行う位置決め装置であって、
放射線照射部と放射線検出器を有する撮像系により前記被検体の異なる2方向の2次元放射線画像を取得する画像取得部と、
仮想空間に前記撮像系の幾何学的配置を再現し、予め収集されたCT画像データに仮想的に透視投影を行うことにより、前記被検体の異なる2方向のDRRを作成するDRR作成部と、
異なる2方向の前記放射線画像と前記DRRとの一致度を評価する評価関数が最大となるように、前記CT画像データと前記放射線画像とを位置合わせする位置合わせ部と、
を備え、
前記位置合わせ部は、
前記CT画像データへの前記透視投影における、前記治療台の移動軸に対応した回転および平行移動に関するパラメータを最適化する多次元最適化部と、
前記撮像系の撮影方向に沿った1次元平行移動に関するパラメータを最適化する1次元最適化部と、
を備えること、を特徴とする位置決め装置。 - 請求項1に記載の位置決め装置において、
前記1次元最適化部は、前記多次元最適化部における最適化により取得された前記評価関数の値に基づいて、1次元最適化を実行するか否かを決定する位置決め装置。 - 請求項1または請求項2に記載の位置決め装置において、
前記位置合わせ部は、前記多次元最適化部と前記1次元最適化部とで、異なる評価関数を用いる位置決め装置。 - 請求項1から請求項3のいずれかに記載の位置決め装置において、
前記位置合わせ部は、前記多次元最適化部と前記1次元最適化部とで、最適化の収束を判定する収束判定値に異なる値を用いる位置決め装置。 - 請求項1から請求項4のいずれかに記載の位置決め装置において、
前記位置合わせ部は、異なる2方向の前記放射線画像と前記DRRとを解像度ごとに異なる評価関数を用いて最適化する多重解像度処理を実行する位置決め装置。 - 請求項5に記載の位置決め装置において、
前記位置合わせ部は、前記1次元最適化部における1次元最適化を解像度ごとに実行するか否かを判断する位置決め装置。 - 治療台上の被検体の患部に向けて治療ビームを照射する放射線治療を行うときに、前記被検体の位置決めを行う位置決め方法であって、
放射線照射部と放射線検出器を有する撮像系により前記被検体の異なる2方向の2次元放射線画像を取得する画像取得工程と、
仮想空間に前記撮像系の幾何学的配置を再現し、予め収集されたCT画像データに仮想的に透視投影を行うことにより、前記被検体の異なる2方向のDRRを作成するDRR作成工程と、
異なる2方向の前記放射線画像と前記DRRとの一致度を評価する評価関数が最大となるように、前記CT画像データと前記放射線画像とを位置合わせする位置合わせ工程と、
を備え、
前記位置合わせ工程は、
前記CT画像データへの前記透視投影における、前記治療台の移動軸に対応した回転および平行移動に関するパラメータを最適化する多次元最適化工程と、
前記撮像系の撮影方向に沿った1次元平行移動に関するパラメータを最適化する1次元最適化工程と、
を含むこと、を特徴とする位置決め方法。
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JP2016079445A JP6668902B2 (ja) | 2016-04-12 | 2016-04-12 | 位置決め装置および位置決め装置の作動方法 |
US15/473,803 US10722733B2 (en) | 2016-04-12 | 2017-03-30 | Positioning apparatus and method of positioning |
CN201710209209.2A CN107281652B (zh) | 2016-04-12 | 2017-03-31 | 定位装置 |
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JP2020065840A (ja) * | 2018-10-26 | 2020-04-30 | 株式会社島津製作所 | X線撮影装置 |
KR20210146384A (ko) | 2019-05-14 | 2021-12-03 | 도시바 에너지시스템즈 가부시키가이샤 | 의용 화상 처리 장치, 기억 매체, 의용 장치, 및 치료 시스템 |
WO2023079811A1 (ja) * | 2021-11-08 | 2023-05-11 | 株式会社日立製作所 | 位置決め装置、放射線治療装置及び位置決め方法 |
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GB2536650A (en) | 2015-03-24 | 2016-09-28 | Augmedics Ltd | Method and system for combining video-based and optic-based augmented reality in a near eye display |
JP6740060B2 (ja) * | 2016-09-01 | 2020-08-12 | キヤノンメディカルシステムズ株式会社 | X線ct装置 |
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US11980506B2 (en) | 2019-07-29 | 2024-05-14 | Augmedics Ltd. | Fiducial marker |
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US11896445B2 (en) | 2021-07-07 | 2024-02-13 | Augmedics Ltd. | Iliac pin and adapter |
JP2023120705A (ja) | 2022-02-18 | 2023-08-30 | 株式会社日立製作所 | 位置決め装置、放射線治療装置及び位置決め方法 |
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US20170291042A1 (en) | 2017-10-12 |
CN107281652B (zh) | 2019-12-13 |
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