JP4576218B2 - ターゲット角のヒール効果補正のための方法及びシステム - Google Patents
ターゲット角のヒール効果補正のための方法及びシステム Download PDFInfo
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- JP4576218B2 JP4576218B2 JP2004350873A JP2004350873A JP4576218B2 JP 4576218 B2 JP4576218 B2 JP 4576218B2 JP 2004350873 A JP2004350873 A JP 2004350873A JP 2004350873 A JP2004350873 A JP 2004350873A JP 4576218 B2 JP4576218 B2 JP 4576218B2
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- 230000000694 effects Effects 0.000 title claims description 18
- 238000000034 method Methods 0.000 title description 23
- 238000012937 correction Methods 0.000 title description 4
- 238000003384 imaging method Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 5
- 230000004907 flux Effects 0.000 description 20
- 238000002591 computed tomography Methods 0.000 description 19
- 230000007423 decrease Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000013170 computed tomography imaging Methods 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4035—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5258—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4064—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with 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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- Medical Informatics (AREA)
- Pathology (AREA)
- Heart & Thoracic Surgery (AREA)
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Pulmonology (AREA)
- Theoretical Computer Science (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Description
h=Lsin(α) (1)
である。
或いは、フィルタ設計は、X線束及びSSPの組み合わせに依存することができる。例えば、中央横列よりも大きいターゲット角ξ120に対してはX線束に基づいてフィルタが決定され、中央横列よりも小さいターゲット角ξ120に対してはSSP関数に基づいてフィルタが決定される。
420 線源からX線を受け取るように位置付けられた複数の検出器横列を有するX線検出器を準備する段階
430 不均一であり且つz軸に沿ったターゲット角の関数である投影ノイズ及び空間分解能のうちの少なくとも1つの均一性を向上させるためにフィルタを用いる段階
Claims (7)
- 被検体(22)をスキャンするためのイメージングシステム(10)であって、
X線源(14)と、
前記線源からX線(16)を受け取るように位置付けられた複数の検出器横列(20)を有するX線検出器(18)と、
前記X線源及び前記X線検出器に動作可能に接続されたコンピュータ(36)と、
を備え、
前記コンピュータは、不均一であり且つz軸に沿ったターゲット角の関数である空間分解能の均一性を向上させるフィルタ処理を行うように設定されていることを特徴とするシステム(10)。 - 前記フィルタf(z)が、
- 前記フィルタは更に、ターゲット角(120)が中央検出器横列よりも小さい場合に前記空間分解能の均一性を向上させ、前記ターゲット角が前記中央検出器横列よりも大きい場合に前記投影ノイズの均一性を向上させるように構成されている請求項1に記載のシステム(10)。
- 前記フィルタは更に、前記ターゲット角(120)が中央検出器横列よりも小さい場合に前記空間分解能の均一性を向上させるように設定されており、前記フィルタf(z)は、
- 前記X線源(14)が、陰極コイル(102)及びターゲット(104)を含むX線管を備え、
前記ターゲットが、前記z軸の方向において、前記X線検出器(18)に対して傾斜した面を有する、請求項1乃至4のいずれかに記載のシステム(10)。 - X線管のターゲット角のヒール効果を少なくとも部分的に補正するための、システム(10)によって実行可能なプログラムが符号化されたコンピュータ可読媒体(52)であって、
前記システム(10)が、
X線源(14)と、
前記線源からX線(16)を受け取るように位置付けられた複数の検出器横列(20)を有するX線検出器(18)とを備え、
前記プログラムが、
不均一であり且つz軸に沿ったターゲット角の関数である空間分解能の均一性を向上させるようフィルタを用いるよう前記コンピュータ(36)に命令するように構成されているコンピュータ可読媒体(52)。 - フィルタを用いる段階は、前記フィルタf(z)が、
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/728,611 US7020243B2 (en) | 2003-12-05 | 2003-12-05 | Method and system for target angle heel effect compensation |
Publications (2)
Publication Number | Publication Date |
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JP2005169110A JP2005169110A (ja) | 2005-06-30 |
JP4576218B2 true JP4576218B2 (ja) | 2010-11-04 |
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Application Number | Title | Priority Date | Filing Date |
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JP2004350873A Active JP4576218B2 (ja) | 2003-12-05 | 2004-12-03 | ターゲット角のヒール効果補正のための方法及びシステム |
Country Status (4)
Country | Link |
---|---|
US (1) | US7020243B2 (ja) |
JP (1) | JP4576218B2 (ja) |
CN (1) | CN100542488C (ja) |
NL (1) | NL1027643C2 (ja) |
Families Citing this family (14)
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CN100492411C (zh) * | 2003-02-20 | 2009-05-27 | 皇家飞利浦电子股份有限公司 | 非对称锥形光束 |
WO2005092195A1 (ja) * | 2004-03-29 | 2005-10-06 | National Institute Of Radiological Sciences | ヒール効果補正フィルタ、x線照射装置、x線ct装置及びx線ct撮像方法 |
US7187750B1 (en) | 2005-09-20 | 2007-03-06 | General Electric Company | Method and apparatus for compensating non-uniform detector collimator plates |
US8033725B2 (en) * | 2006-06-02 | 2011-10-11 | Koninklijke Philips Electronics N.V. | X-ray image apparatus and device for and method of calibrating an X-ray image apparatus |
FR2905256B1 (fr) * | 2006-09-05 | 2008-11-21 | Gen Electric | Procede d'obtention d'une image de tomosynthese |
JP4817065B2 (ja) * | 2006-10-26 | 2011-11-16 | 株式会社島津製作所 | 放射線撮像装置 |
EP2126931B1 (en) * | 2007-01-26 | 2011-09-21 | Koninklijke Philips Electronics N.V. | Spectrum-preserving heel effect compensation filter made from the same material as anode plate |
EP2352432B1 (en) * | 2008-11-07 | 2017-02-22 | Koninklijke Philips N.V. | Cone beam z-axis coverage |
JP5568232B2 (ja) * | 2008-11-17 | 2014-08-06 | 富士フイルム株式会社 | 断層画像撮影装置 |
JP2010119507A (ja) * | 2008-11-18 | 2010-06-03 | Fujifilm Corp | 断層画像撮影装置 |
BR112013011030A8 (pt) * | 2010-11-08 | 2017-11-07 | Koninklijke Philips Electronics Nv | Fonte de raios x, sistema de aquisição de imagens por raios x, método para determinar alterações no rendimento de emissões de raios x de um tubo de raios x, elemento de programa de computador para controlar um aparelho e meio legível por computador |
FR2997284B1 (fr) | 2012-10-30 | 2016-06-17 | Gen Electric | Procede d'obtention d'images de tomosynthese |
US9642581B2 (en) * | 2013-11-12 | 2017-05-09 | KUB Technologies, Inc. | Specimen radiography with tomosynthesis in a cabinet |
US10488351B2 (en) | 2016-09-07 | 2019-11-26 | KUB Technologies, Inc. | Specimen radiography with tomosynthesis in a cabinet with geometric magnification |
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2003
- 2003-12-05 US US10/728,611 patent/US7020243B2/en active Active
-
2004
- 2004-12-01 CN CNB2004100980133A patent/CN100542488C/zh active Active
- 2004-12-02 NL NL1027643A patent/NL1027643C2/nl not_active IP Right Cessation
- 2004-12-03 JP JP2004350873A patent/JP4576218B2/ja active Active
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Also Published As
Publication number | Publication date |
---|---|
CN100542488C (zh) | 2009-09-23 |
CN1623511A (zh) | 2005-06-08 |
NL1027643C2 (nl) | 2006-06-27 |
US7020243B2 (en) | 2006-03-28 |
NL1027643A1 (nl) | 2005-06-07 |
US20050123100A1 (en) | 2005-06-09 |
JP2005169110A (ja) | 2005-06-30 |
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