JP5349008B2 - コンピュータ断層撮影装置及び画像再構成方法 - Google Patents
コンピュータ断層撮影装置及び画像再構成方法 Download PDFInfo
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- JP5349008B2 JP5349008B2 JP2008283542A JP2008283542A JP5349008B2 JP 5349008 B2 JP5349008 B2 JP 5349008B2 JP 2008283542 A JP2008283542 A JP 2008283542A JP 2008283542 A JP2008283542 A JP 2008283542A JP 5349008 B2 JP5349008 B2 JP 5349008B2
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- 238000000034 method Methods 0.000 title claims description 14
- 238000002591 computed tomography Methods 0.000 title claims description 9
- 238000012545 processing Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 14
- 238000013480 data collection Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 239000011295 pitch Substances 0.000 description 8
- 230000000295 complement effect Effects 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012952 Resampling Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013527 convolutional neural network Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/003—Reconstruction from projections, e.g. tomography
- G06T11/006—Inverse problem, transformation from projection-space into object-space, e.g. transform methods, back-projection, algebraic methods
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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
- A61B6/027—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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2211/00—Image generation
- G06T2211/40—Computed tomography
- G06T2211/416—Exact reconstruction
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2211/00—Image generation
- G06T2211/40—Computed tomography
- G06T2211/421—Filtered back projection [FBP]
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- Algebra (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
Description
2)N−PIウィンドウ内のすべてのデータは同じ重みで使用され、これはノイズ低減に有益であり、そのため、アルゴリズムが患者の動きの影響を受けやすく、実データが不完全になる。
3)N−PI再構成は、ヘリカルピッチの選択を制限する。例えば、0.75〜0.85の範囲のピッチは、データのごく一部分しか利用されないため、3−PIウィンドウで使用するには速すぎ、1−PIウィンドウで使用するには最適でない。
多項式:p(x)3x2−2x3
三角法:p(x)=(1/2)(1−cos(πx))またはp(x)=sin2(πx/2)
一般に、関数p()は、p(0)=0,p(1)=1を満たす任意の関数であり、pは、0から1に単調増加する。
Claims (8)
- X線源と、
前記X線源から発生され、被検体を透過したX線を検出するX線検出器と、
前記X線検出器を介して投影データを収集するデータ収集装置と、
前記投影データに重み付け処理を行なう手段と、
前記重み付けされた投影データを用いて画像を再構成する再構成処理手段とを具備し、
前記重み付け処理は、次の式で与えられる重み関数を使用して前記投影データを処理し
ることを特徴とするコンピュータ断層撮影装置。 - 前記処理装置は、検出器列に沿ってフィルタリングを適用するフィルタリングサブユニットを有する請求項1に記載の装置。
- 前記処理装置は、検出器列に沿った方向以外の方向にフィルタリングを適用するフィルタリングサブユニットを有する請求項1に記載の装置。
- 前記処理は、検出器列に沿ってフィルタリングする段階を含む、請求項5に記載の方法。
- 前記処理は、検出器列に沿った方向以外の方向にフィルタリングする段階を含む、請求項5に記載の方法。
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Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US98516107P | 2007-11-02 | 2007-11-02 | |
US60/985,161 | 2007-11-02 |
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JP2009112815A JP2009112815A (ja) | 2009-05-28 |
JP5349008B2 true JP5349008B2 (ja) | 2013-11-20 |
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JP2008283542A Active JP5349008B2 (ja) | 2007-11-02 | 2008-11-04 | コンピュータ断層撮影装置及び画像再構成方法 |
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US (1) | US8494111B2 (ja) |
JP (1) | JP5349008B2 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8270564B2 (en) | 2008-12-01 | 2012-09-18 | Teratech Corporation | Digital integration with detector correction |
US8731266B2 (en) * | 2009-12-17 | 2014-05-20 | General Electric Company | Method and system for correcting artifacts in image reconstruction |
US8270561B2 (en) | 2010-10-13 | 2012-09-18 | Kabushiki Kaisha Toshiba | Motion weighting in computed tomography (CT) with cone angle |
US8724876B2 (en) | 2011-10-18 | 2014-05-13 | Kabushiki Kaisha Toshiba | Method and system for substantially reducing streak artifacts in helical cone beam computer tomography (CT) |
CN104888356B (zh) * | 2015-06-30 | 2018-03-02 | 瑞地玛医学科技有限公司 | 影像引导及呼吸运动分析*** |
CN118196232A (zh) * | 2024-05-16 | 2024-06-14 | 有方(合肥)医疗科技有限公司 | 锥束螺旋ct重建方法、装置、***、电子设备及存储介质 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6917663B2 (en) * | 2003-06-16 | 2005-07-12 | Kabushiki Kaisha Toshiba | Cone-beam reconstruction apparatus and computed tomography apparatus |
US7424088B2 (en) | 2004-09-29 | 2008-09-09 | Kabushiki Kaisha Toshiba | Image reconstruction method using Hilbert transform |
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2008
- 2008-10-02 US US12/244,590 patent/US8494111B2/en active Active
- 2008-11-04 JP JP2008283542A patent/JP5349008B2/ja active Active
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Publication number | Publication date |
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US20090154639A1 (en) | 2009-06-18 |
JP2009112815A (ja) | 2009-05-28 |
US8494111B2 (en) | 2013-07-23 |
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