JP5715335B2 - 任意のスペクトルにおける計算機式断層写真法画像の形成のための順投影 - Google Patents
任意のスペクトルにおける計算機式断層写真法画像の形成のための順投影 Download PDFInfo
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- JP5715335B2 JP5715335B2 JP2009266912A JP2009266912A JP5715335B2 JP 5715335 B2 JP5715335 B2 JP 5715335B2 JP 2009266912 A JP2009266912 A JP 2009266912A JP 2009266912 A JP2009266912 A JP 2009266912A JP 5715335 B2 JP5715335 B2 JP 5715335B2
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- 238000001228 spectrum Methods 0.000 title claims description 28
- 238000002591 computed tomography Methods 0.000 title claims description 26
- 230000015572 biosynthetic process Effects 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims description 81
- 238000000034 method Methods 0.000 claims description 57
- 230000009977 dual effect Effects 0.000 claims description 30
- 239000000126 substance Substances 0.000 claims description 15
- 238000000354 decomposition reaction Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229910001868 water Inorganic materials 0.000 claims description 11
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 description 18
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 210000004872 soft tissue Anatomy 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 239000002872 contrast media Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 230000007170 pathology Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Classifications
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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
- A61B6/48—Diagnostic techniques
- A61B6/482—Diagnostic techniques involving multiple energy imaging
-
- 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]
-
- 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
- A61B6/505—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 diagnosis of bone
-
- 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
- A61B6/4035—Arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Biophysics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Biomedical Technology (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Dentistry (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Pulmonology (AREA)
- Theoretical Computer Science (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Description
m1(x,y)は、位置座標x,yでの物質1の密度であり、
m2(x,y)は、位置座標x,yでの物質2の密度であり、
b(E,i)は、エネルギ・レベルEにおいてボウタイ・フィルタによって与えられる検出器iにおいて受光されたときの減弱レベルであり、
μ1(E)は、物質1の線減弱係数であり、
μ2(E)は、物質2の線減弱係数であり、
pi(θ)は、ガントリ角度θでの検出器iにおける投影であり、
θは、検出器が円弧形であるため各々の検出器素子(i)と管線源とを結ぶ射線間の角度差であり、
pc,i(θ)は、ガントリ角度θでの検出器iにおける補正後投影であり、
S(E)は、順投影を算出するときのスペクトル(又はエネルギ・レベル)である(例えば120kVp)。
210 ワークステーション
212 入力
214 出力
216 記憶装置
220 ネットワーク・サーバ
250 イメージング・システム
Claims (10)
- 任意のエネルギ・スペクトルにおいて対象の計算機式断層写真法画像を再構成する方法であって、
第一のエネルギ・スペクトルにおいて前記対象の第一の計算機式断層写真法走査を行なうステップと、
第二のエネルギ・スペクトルにおいて前記対象の第二の計算機式断層写真法走査を行なうステップと、
前記対象の第一の基底物質及び第二の基底物質の線減弱特性を得るように、前記第一及び第二の計算機式断層写真法走査に対して基底物質分解を実行するステップと、
前記第一の基底物質及び前記第二の基底物質の前記線減弱特性に基づいて前記第一及び第二のエネルギ・スペクトルとは異なる任意のエネルギ・スペクトルにおける前記対象の新たな投影を形成するステップと、
前記新たな投影を再構成して、前記任意のエネルギ・レベルにおける計算機式断層写真法画像を形成するステップと、
を備える、方法。 - 任意のエネルギ・スペクトルにおける前記計算機式断層写真法画像の再構成は、前記第一のエネルギ・スペクトル及び前記第二のエネルギ・スペクトルに基づく物質密度画像の前記形成を行なわずに投影空間で行なわれる、請求項1に記載の方法。
- 前記第一のエネルギ・レベルは低エネルギ・レベルであり、前記第二のエネルギ・レベルは高エネルギ・レベルである、請求項1または2に記載の方法。
- 前記第一のエネルギ・レベルは80kVpである、請求項1乃至3のいずれかに記載の方法。
- 前記第二のエネルギ・レベルは140kVpである、請求項4に記載の方法。
- 前記第一又は第二の物質の少なくとも一方は水、ヨード、カルシウムのいずれかである、請求項1乃至5のいずれかに記載の方法。
- 前記二重エネルギ走査に基づいて少なくとも一つの物質密度画像又は単色画像を形成するステップをさらに含んでおり、前記基底物質の前記線減弱特性は前記少なくとも一つの物質密度画像又は単色画像から得られる、請求項1乃至5のいずれかに記載の方法。
- 少なくとも一つのボウタイ・フィルタが前記二重エネルギ走査において用いられ、前記検出器における前記ボウタイ・フィルタの物質減弱を決定するステップをさらに含んでいる請求項1乃至7のいずれかに記載の方法。
- 合成水走査を適用することにより、前記第一の位置での前記第一及び第二の物質についての前記検出器における前記模擬された減弱レベルを補正するステップをさらに含んでいる請求項1乃至8のいずれかに記載の方法。
- 前記任意のエネルギ・レベルは単色エネルギ・レベルである、請求項1乃至9のいずれかに記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US12/324,008 | 2008-11-26 | ||
US12/324,008 US8260023B2 (en) | 2008-11-26 | 2008-11-26 | Forward projection for the generation of computed tomography images at arbitrary spectra |
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JP2010125332A JP2010125332A (ja) | 2010-06-10 |
JP5715335B2 true JP5715335B2 (ja) | 2015-05-07 |
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JP2009266912A Expired - Fee Related JP5715335B2 (ja) | 2008-11-26 | 2009-11-25 | 任意のスペクトルにおける計算機式断層写真法画像の形成のための順投影 |
Country Status (4)
Country | Link |
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US (1) | US8260023B2 (ja) |
JP (1) | JP5715335B2 (ja) |
CN (1) | CN101732062A (ja) |
DE (1) | DE102009044614A1 (ja) |
Families Citing this family (16)
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US8050479B2 (en) * | 2009-02-26 | 2011-11-01 | General Electric Company | Method and system for generating a computed tomography image |
US8611627B2 (en) | 2009-12-23 | 2013-12-17 | General Electric Company | CT spectral calibration |
CN103339497B (zh) * | 2011-01-31 | 2016-01-13 | 皇家飞利浦电子股份有限公司 | 探测值处理设备 |
US8483471B2 (en) * | 2011-06-30 | 2013-07-09 | General Electric Company | Method and system for scatter correction in X-ray imaging |
CN103892859A (zh) * | 2012-12-28 | 2014-07-02 | Ge医疗系统环球技术有限公司 | 基于多模式Scout扫描的CT成像方法和CT系统 |
JP6475691B2 (ja) * | 2013-03-21 | 2019-02-27 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | X線画像における構造のコンピュータ援用検出のための方法およびx線システム |
JP6482934B2 (ja) | 2014-06-03 | 2019-03-13 | キヤノンメディカルシステムズ株式会社 | 画像処理装置、放射線検出装置および画像処理方法 |
US9913622B2 (en) | 2015-02-23 | 2018-03-13 | Toshiba Medical Systems Corporation | X-ray CT apparatus and image processing device |
WO2017019554A1 (en) * | 2015-07-24 | 2017-02-02 | Photo Diagnostic Systems, Inc. | Method and apparatus for performing multi-energy (including dual energy) computed tomography (ct) imaging |
WO2018111164A1 (en) * | 2016-12-16 | 2018-06-21 | Prismatic Sensors Ab | Reproduction of conventional computed tomography images from spectral computed tomography data |
US10573030B2 (en) | 2017-04-07 | 2020-02-25 | Photo Diagnostic Systems, Inc. | Method for artifact reduction using monoenergetic data in computed tomography |
CN109959669B (zh) * | 2017-12-26 | 2021-02-23 | 清华大学 | 基材料分解方法和装置及计算机可读存储介质 |
JP7195961B2 (ja) | 2019-02-08 | 2022-12-26 | キヤノンメディカルシステムズ株式会社 | 医用処理装置、x線ctシステム及び処理プログラム |
JP7321846B2 (ja) * | 2019-09-04 | 2023-08-07 | キヤノンメディカルシステムズ株式会社 | X線ctシステム及び医用処理装置 |
WO2022218441A1 (en) * | 2021-04-16 | 2022-10-20 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for imaging |
WO2023100926A1 (ja) * | 2021-11-30 | 2023-06-08 | キヤノンメディカルシステムズ株式会社 | 医用情報処理方法及び医用情報処理装置 |
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AU2002246736A1 (en) * | 2000-10-24 | 2002-08-06 | The Johns Hopkins University | Method and apparatus for multiple-projection, dual-energy x-ray absorptiometry scanning |
US7627078B2 (en) * | 2002-11-08 | 2009-12-01 | Ge Medical Systems Global Technology Company, Llc | Methods and apparatus for detecting structural, perfusion, and functional abnormalities |
US6999549B2 (en) * | 2002-11-27 | 2006-02-14 | Ge Medical Systems Global Technology, Llc | Method and apparatus for quantifying tissue fat content |
US6950493B2 (en) * | 2003-06-25 | 2005-09-27 | Besson Guy M | Dynamic multi-spectral CT imaging |
US6987833B2 (en) * | 2003-10-16 | 2006-01-17 | General Electric Company | Methods and apparatus for identification and imaging of specific materials |
US7190757B2 (en) * | 2004-05-21 | 2007-03-13 | Analogic Corporation | Method of and system for computing effective atomic number images in multi-energy computed tomography |
US7352885B2 (en) * | 2004-09-30 | 2008-04-01 | General Electric Company | Method and system for multi-energy tomosynthesis |
CN100443052C (zh) * | 2004-10-14 | 2008-12-17 | Ge医疗系统环球技术有限公司 | X射线ct装置 |
US7382853B2 (en) * | 2004-11-24 | 2008-06-03 | General Electric Company | Method and system of CT data correction |
CN101313332B (zh) * | 2005-09-06 | 2011-05-25 | 皇家飞利浦电子股份有限公司 | 具有多个能窗的计算机断层摄影中的数据处理和分析 |
DE102005049586A1 (de) * | 2005-10-17 | 2007-04-26 | Siemens Ag | Verfahren zur Erzeugung von CT-Darstellungen in der Röntgen-Computertomographie |
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CN101266216A (zh) * | 2007-03-14 | 2008-09-17 | 清华大学 | 标定双能ct系统的方法和图像重建方法 |
US8194961B2 (en) * | 2008-04-21 | 2012-06-05 | Kabushiki Kaisha Toshiba | Method, apparatus, and computer-readable medium for pre-reconstruction decomposition and calibration in dual energy computed tomography |
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2008
- 2008-11-26 US US12/324,008 patent/US8260023B2/en not_active Expired - Fee Related
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2009
- 2009-11-20 DE DE102009044614A patent/DE102009044614A1/de not_active Withdrawn
- 2009-11-25 JP JP2009266912A patent/JP5715335B2/ja not_active Expired - Fee Related
- 2009-11-26 CN CN200910252917A patent/CN101732062A/zh active Pending
Also Published As
Publication number | Publication date |
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US20100128948A1 (en) | 2010-05-27 |
JP2010125332A (ja) | 2010-06-10 |
CN101732062A (zh) | 2010-06-16 |
DE102009044614A1 (de) | 2010-06-17 |
US8260023B2 (en) | 2012-09-04 |
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