JP5337031B2 - Ct画像取得 - Google Patents
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- JP5337031B2 JP5337031B2 JP2009524724A JP2009524724A JP5337031B2 JP 5337031 B2 JP5337031 B2 JP 5337031B2 JP 2009524724 A JP2009524724 A JP 2009524724A JP 2009524724 A JP2009524724 A JP 2009524724A JP 5337031 B2 JP5337031 B2 JP 5337031B2
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- 230000005855 radiation Effects 0.000 claims description 65
- 238000000034 method Methods 0.000 claims description 25
- 238000005070 sampling Methods 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 5
- 238000002247 constant time method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000002591 computed tomography Methods 0.000 description 25
- 238000003384 imaging method Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 238000013170 computed tomography imaging Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000009659 non-destructive testing Methods 0.000 description 1
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- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/58—Testing, adjusting or calibrating thereof
- A61B6/587—Alignment of source unit to detector unit
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- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4435—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure
- A61B6/4441—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure the rigid structure being a C-arm or U-arm
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- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/027—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4021—Arrangements for generating radiation specially adapted for radiation diagnosis involving movement of the focal spot
- A61B6/4028—Arrangements for generating radiation specially adapted for radiation diagnosis involving movement of the focal spot resulting in acquisition of views from substantially different positions, e.g. EBCT
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4291—Arrangements for detecting radiation specially adapted for radiation diagnosis the detector being combined with a grid or grating
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
- A61B6/508—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for non-human patients
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Description
Claims (32)
- 検査領域に配された物体に対し複数の角度位置で断層投影データを取得する装置において、
扇形形状の横断面を持つ放射線ビームを放射する放射線源、
前記放射線源により放射され、前記検査領域を横断した放射線を検出する放射線感応検出器であって、前記放射線源及び前記検出器が、一定の機械的関係をもって回転軸の周りを回転されて所与のFOVを提供し、前記回転軸は、前記回転軸に対して横方向のFOVの中心をなす、検出器、及び
前記横方向のFOVの大きさを変更するように、前記放射線源及び前記検出器並びに前記回転軸を変位させる変位手段
を有し、前記変位手段は、前記放射線ビームの中心線が前記横方向のFOVの前記中心から離れて変位するように、前記放射線源及び前記検出器を前記検出器の主面に平行な方向に移動させる手段、及び前記放射線源及び前記検出器の前記移動に伴って、前記検出器と前記横方向のFOVの縁との間の最小距離を一定に保つように、前記回転軸の位置を前記検出器の主面に垂直な方向に移動させる手段、を有する装置。 - 前記物体を示す体積データを生成するために、前記投影データを再構成する再構成装置を含む請求項1に記載の装置。
- 前記投影データはX線CTデータである請求項1又は2に記載の装置。
- 前記放射線ビームの前記横断面は前記検出器に対し垂直である光線を含み、前記光線は前記横方向のFOVの中心から離れて変位している請求項1乃至3のいずれか1項に記載の装置。
- 前記光線は前記検出器の横寸法の中心と交差している請求項4に記載の装置。
- 前記光線は前記放射線ビームの中心線である請求項4又は5に記載の装置。
- 前記検出器はフラットパネル検出器である請求項1乃至6のいずれか1項に記載の装置。
- 前記放射線ビームの前記横断面は第1及び第2の最外部の光線を含み、前記最外部の光線は等しい入射角で前記検出器と交差している請求項1乃至7のいずれか1項に記載の装置。
- 前記検出器は当該検出器が冗長な投影データを生成する遷移領域を含む請求項1乃至8のいずれか1項に記載の装置。
- 全ビームの取得形状を提供するために、前記横方向のFOVの中心に対し前記放射線源及び前記検出器の位置を変更する手段を有する請求項1乃至9のいずれか1項に記載の装置。
- 前記横方向のFOVの大きさを変更するために、前記放射線源及び前記検出器を回転軸の周りを回転させる手段を含む請求項1乃至10のいずれか1項に記載の装置。
- 前記横方向のFOVの所望の寸法を特定するユーザ入力を受信するユーザインタフェースを含む請求項1乃至11のいずれか1項に記載の装置において、前記検出器の所望の位置を決めるために前記所望の寸法を使用する装置。
- らせん状走査軌道に従って断層投影データを取得する請求項1乃至12のいずれか1項に記載の装置。
- 約360°の軸走査軌道に従って断層投影データを取得する請求項1乃至13のいずれか1項に記載の装置。
- 扇形形状の横断面を持つ放射線ビームを放射する放射線源、
前記放射線源により放射され、検査領域を横断した放射線を検出する放射線感応検出器であって、前記放射線源及び前記検出器が、一定の機械的関係をもって回転軸の周りを回転されて所与のFOVを提供し、前記回転軸は、前記回転軸に対し横方向のFOVの中心をなす、検出器、
前記横方向のFOVの大きさを変更するように、前記放射線源及び前記検出器並びに前記回転軸を変位させる変位手段、及び
再構成手段、
により、検査領域に配された物体に対し複数の角度位置で断層投影データを取得し再構成を行うCT方法であって、
前記変位手段が、前記横方向のFOVの大きさを変更するように、前記放射線源及び前記検出器並びに前記回転軸を変位させるステップであって、前記放射線ビームの中心線が前記横方向のFOVの前記中心から離れて変位するように、前記放射線源及び前記検出器を前記検出器の主面に平行な方向に移動させ、更に、前記検出器と前記横方向のFOVの縁との間の最小距離を一定に保つように、前記回転軸の位置を前記検出器の主面に垂直な方向に移動させることを含む、ステップ、
前記放射線源が、変更された前記横方向のFOVの一部を横断する第1の放射線を放射するステップ、
前記検出器が、前記第1の放射線を示すCT投影データを取得するステップ、
前記放射するステップ及び前記取得するステップを複数の角度位置で繰り返すステップ、及び
前記再構成手段が、第1の体積データを生成するために、前記CT投影データを再構成するステップ
を含む方法。 - 前記変位手段が、前記横方向のFOVの大きさを更に変更するように、前記放射線源及び前記検出器並びに前記回転軸を変位させるステップ、
前記放射線源が、変更された前記横方向のFOVの少なくとも一部を横断する第2の放射線を放射するステップ、
前記検出器が、前記第2の放射線を示す第2のCT投影データを取得するステップ、
前記放射するステップ及び前記取得するステップを複数の角度位置で繰り返すステップ、及び
前記再構成手段が、第2の体積データを生成するために、前記第2のCT投影データを再構成するステップ
をさらに含む請求項15に記載の方法。 - 前記第2の投影データは前記横方向のFOV全体を横断する請求項16に記載の方法。
- 前記変位させるステップは、前記放射線源及び前記検出器を前記横方向のFOVの接線方向に移動させることを含む請求項15乃至17のいずれか1項に記載の方法。
- 前記横方向のFOVの所望の寸法を特定するユーザ入力を受信するステップ、及び
前記検出器の所望の位置を決めるために前記所望の寸法を使用するステップ
を含む請求項15乃至18のいずれか1項に記載の方法。 - 前記検出器はフラットパネル検出器であり、前記横断面は第1及び第2の最外部の光線を含み、並びに前記最外部の光線は等しい入射角で前記検出器と交差している請求項15乃至19のいずれか1項に記載の方法。
- 前記横断面は中心線を含み、前記中心線は前記横方向のFOVの中心から横方向に変位し、前記中心線は前記検出器に垂直な角度で前記検出器と交差している請求項15乃至20のいずれか1項に記載の方法。
- 前記中心線は、前記検出器の横寸法の中心と交差している請求項15乃至21のいずれか1項に記載の方法。
- 前記放射線源及び前記検出器を前記回転軸の周りで回転させるステップを含む請求項15乃至22のいずれか1項に記載の方法。
- 前記検出器により受信される散乱放射線を減少させるために、2次元の散乱線除去格子を使用するステップを含む請求項15乃至23のいずれか1項に記載の方法。
- らせん状又は軸走査軌道に従ってCT投影データを取得するステップを含む請求項15乃至24のいずれか1項に記載の方法。
- 放射線を放射するX線源、
前記X線源により放射された放射線を検出するX線検出器、
変位手段、及び
体積データを生成するために、投影データを再構成する再構成装置
を有するCT装置において、
前記X線源及び前記X線検出器は、一定の機械的関係をもって回転軸の周りを回転されて所与のFOVを提供し、前記回転軸は、前記回転軸に対して横方向のFOVの中心をなし、
前記X線源によって放射される放射線は、前記回転軸に対し横方向の扇角を持ち、
前記変位手段は、前記横方向のFOVの大きさを変更するように、前記X線源及び前記X線検出器並びに前記回転軸を変位させるように構成されるものであって、前記放射線の中心線が前記横方向のFOVの前記中心から離れて変位するように、前記X線源及び前記X線検出器を前記X線検出器の主面に平行な方向に移動させる手段、及び前記X線源及び前記X線検出器の前記移動に伴って、前記X線検出器と前記横方向のFOVの縁との間の最小距離を一定に保つように、前記回転軸の位置を前記X線検出器の主面に垂直な方向に移動させる手段、を有し、
前記横方向のFOVの完全な角度のサンプリングは、180°に扇角を加えたよりも大きい角度にわたり投影データの取得を必要とする、
CT装置。 - 回転ガントリを更に含み、前記X線源及び前記X線検出器は前記回転ガントリに対し可動状態で取り付けられる請求項26に記載の装置。
- 前記横方向のFOVの完全な角度のサンプリングは、約360°の角度範囲にわたる投影データの取得を必要とする請求項26又は27に記載の装置。
- 前記X線源により放射される前記放射線の中心線は、前記X線検出器の横寸法の中心と交差している請求項26乃至28のいずれか1項に記載の装置。
- 前記X線検出器は平面であり、前記中心線は前記X線検出器の前記平面に垂直である請求項26乃至29のいずれか1項に記載の装置。
- 前記X線検出器と前記検査領域との間に配され、前記X線検出器の横寸法の中心に対し対称である散乱線除去格子を含む請求項26乃至30のいずれか1項に記載の装置。
- 円形、円−線、らせん状又は鞍状軌道のうちの1つに従ってデータを取得する手段を含む請求項26乃至31のいずれか1項に記載の装置。
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US82267806P | 2006-08-17 | 2006-08-17 | |
US60/822,678 | 2006-08-17 | ||
PCT/US2007/074201 WO2008021671A2 (en) | 2006-08-17 | 2007-07-24 | Computed tomography image acquisition |
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JP2010500902A JP2010500902A (ja) | 2010-01-14 |
JP2010500902A5 JP2010500902A5 (ja) | 2010-09-09 |
JP5337031B2 true JP5337031B2 (ja) | 2013-11-06 |
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EP (1) | EP2053972B1 (ja) |
JP (1) | JP5337031B2 (ja) |
CN (1) | CN101505658B (ja) |
RU (1) | RU2452385C2 (ja) |
WO (1) | WO2008021671A2 (ja) |
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