JP2008515513A - コンピュータ断層撮影方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000002591 computed tomography Methods 0.000 title claims abstract description 38
- 230000005855 radiation Effects 0.000 claims abstract description 129
- 238000007476 Maximum Likelihood Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 47
- 241000446313 Lamella Species 0.000 claims description 19
- 238000004590 computer program Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 17
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000000747 cardiac effect Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000000275 quality assurance Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
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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
- A61B6/02—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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- 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
- A61B6/40—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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- 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
- A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4064—Arrangements for generating radiation specially adapted for radiation diagnosis specially adapted for producing a particular type of beam
- A61B6/4085—Cone-beams
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- A—HUMAN NECESSITIES
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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
- A61B6/02—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
- 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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Abstract
Description
回転軸の周りで検査区域と放射線源との間の円形相対運動を生成するステップと、
前記放射線源を使用して円錐放射線ビームを生成するステップであって、前記円錐放射線ビームが、前記放射線源の放射領域から放射され、前記円錐放射線ビームが、前記検査区域を横断し、前記放射領域の位置が、前記相対運動中に前記回転軸に平行に移動されるステップと、
前記相対運動中に検出器ユニットを使用して測定を取得するステップであって、前記測定値が、前記検査区域を横断した後の前記円錐放射線ビームの強度に依存するステップと、
前記相対運動中の前記回転軸(14)に平行な線(27)上に配置され、互いから離間した少なくとも2つの位置(23a、23b)の間で前記放射領域の位置を切り替えるステップと、
前記測定値を使用して前記検査区域の画像を再構成するステップと、
を有する本発明によるコンピュータ断層撮影方法を用いて達成される。
μk (n+1)=[μk (n)+Δ(n) k,2] (6)
Claims (7)
- 回転軸の周りで検査区域と放射線源との間の円形の相対運動を生成するステップと、
前記放射線源を使用して円錐放射線ビームを生成するステップであって、前記円錐放射線ビームが前記放射線源の放射領域から放射され、前記円錐放射線ビームが前記検査区域を横断し、前記放射領域の位置が前記相対運動中に前記回転軸に平行に移動される当該ステップと、
前記相対運動中に検出器ユニットを使用して測定値を取得するステップであって、前記測定値が前記検査区域を横断した後の前記円錐放射線ビームの強度に依存する、当該ステップと、
前記相対運動中に、前記回転軸に平行な線上に配置された互いから離間した少なくとも2つの位置の間で前記放射領域の位置を切り替えるステップと、
前記測定値を使用して前記検査区域の画像を再構成するステップと、
を有するコンピュータ断層撮影方法。 - 前記相対運動中に、前記放射線源が、前記検査区域に対する異なる放射線源位置を通過し、前記放射線源位置の各々において、前記測定値が取得され、前記放射線源が1つの放射線源位置にある間の前記放射領域の位置が、前記放射線源が連続した放射線源位置にある間の前記放射領域の位置と異なる、請求項1に記載のコンピュータ断層撮影方法。
- 前記検査区域の前記画像が、反復的な再構成方法、特に代数的再構成方法又は最尤法を使用して再構成される、請求項1に記載のコンピュータ断層撮影方法。
- 回転軸の周りで検査区域と放射線源との間の円形の相対運動を生成する駆動構成と、
前記検査区域を横断する円錐放射線ビームを生成する放射線源であって、前記放射線源が、前記円錐放射線ビームが放射される放射領域を有し、前記放射領域の位置が前記相対運動中に前記回転軸に平行に移動可能である当該放射線源と、
前記相対運動中に測定値を取得する検出器ユニットと、
前記測定値を使用して前記検査区域の画像を再構成する再構成ユニットと、
前記駆動構成、前記放射線源、前記検出器ユニット及び前記再構成ユニットを請求項1のステップによって制御する制御ユニットと、
を有するコンピュータ断層撮影装置。 - 前記検出器ユニットが、前記回転軸に平行に向けられたラメラを持つ一次元散乱線除去グリッドを有する、請求項4に記載のコンピュータ断層撮影装置。
- 前記検出器ユニットが、前記回転軸に平行に向けられたラメラと、前記回転軸に垂直に向けられたラメラとを持つ二次元散乱線除去グリッドを有し、前記回転軸に平行に向けられたラメラのアスペクト比が、前記回転軸に垂直に向けられたラメラのアスペクト比より大きい、請求項4に記載のコンピュータ断層撮影装置。
- コンピュータ断層撮影装置の駆動構成、放射線源、検出器ユニット及び再構成ユニットを請求項1のステップによって制御する制御ユニットに対するコンピュータプログラム。
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EP04104892 | 2004-10-06 | ||
PCT/IB2005/053154 WO2006038145A1 (en) | 2004-10-06 | 2005-09-23 | Computed tomography method |
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JP2008515513A true JP2008515513A (ja) | 2008-05-15 |
JP2008515513A5 JP2008515513A5 (ja) | 2008-11-06 |
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US (1) | US20090185655A1 (ja) |
EP (1) | EP1799107A1 (ja) |
JP (1) | JP2008515513A (ja) |
CN (1) | CN101035464A (ja) |
WO (1) | WO2006038145A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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Also Published As
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CN101035464A (zh) | 2007-09-12 |
EP1799107A1 (en) | 2007-06-27 |
WO2006038145A1 (en) | 2006-04-13 |
US20090185655A1 (en) | 2009-07-23 |
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