JP2005205206A - 脂肪水分離磁気共鳴イメージング方法、及び定常自由歳差運動を用いたシステム - Google Patents
脂肪水分離磁気共鳴イメージング方法、及び定常自由歳差運動を用いたシステム Download PDFInfo
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Abstract
【課題】中低磁場MRIでSSFPシーケンスを用いた水脂肪分離画像の撮像に於いて、静磁場不均一による周波数アーチファクトを消去した分離画像を実現する方法を提供する。
【解決手段】定常自由歳差運動(SSFP)の釣り合いがとれた状態の水−脂肪が選別された磁気共鳴(MR)画像が作り出される。取得されたSSFP信号は、多重エコー成分に分離される。この多重エコー成分の中では、水信号及び脂肪信号との間の位相配置が、SSFPイメージングシーケンスのTR及びTEの値を適切に選択すすることで制御される。この分離されたエコー成分から、場の不均一性の影響は修正され、水画像及び脂肪画像は選別される。
【選択図】 図3
Description
磁気共鳴イメージング(MRI)は、よく知られる磁気共鳴現象の様な核磁気共鳴(NMR)に影響されやすい原子核の実質的集合体を有する被検体(例えば、人体)についての内部構造を表すデジタル化された可視的画像を取得するために、広く受け入れられ商業的にも有効な非侵襲性技術である。MRIにおいては、原子核に強い主磁場(B0)を印加することで、映像対象となる患者の体内の原子核を偏極させる。
Claims (10)
- MRI装置を用いて、定常自由歳差運動(SSFP)に保たれている被検体の水及び脂肪磁気共鳴(MR)画像を選別し認識する方法であって、
(a)分離の後のエコー成分における所望する水−脂肪位相配置に従って、位相が周期化されたSSFPシーケンスのための、繰り返し時間(TR)及びエコー時間(TE)を選択し、
(b)選択されたTR及びTEにSSFPシーケンスを適用し、画像化対象である前記被検体からMRデータを取得し、
(c)取得した前記SSFPデータを、水及び脂肪信号がその中で所望の位相配置を有する多重エコー信号に分離し、
(d)分離された前記エコーデータから或いはスキャナから有用であるフィールド修正マップを生成し、
(e)前記フィールド修正マップを適用して、水信号及び脂肪信号が直交し又は著しく直交する様な分離されたエコーデータ画像を修正し、
(f)位相修正されたエコー画像から水及び脂肪画像を生成すること、
を具備する。 - TR及びTEは、エコー分離の後、水信号及び脂肪信号がS0において直交し、S−1において非平行となるように選択される請求項1に係る方法。
- 分離の後、水信号及び脂肪信号が全てのエコー成分において直交するように、TR及びTEはTR=2TEとして選択される請求項1に係る方法。
- 位相が周期化されたマスターSSFPシーケンスは、低空間分解能のアシストSSFPイメージングシーケンスと共に実行される請求項1に係る方法
- マスターSSFPシーケンスのTR及びTEは、以下それぞれTRm及びTEmと示すが、TRmは2TEmと等しくなるように、且つその結果水信号及び脂肪信号が全てのエコー成分において著しく直交するように選択され、
アシストSSFPシーケンスの前記TR及びTEは、以下それぞれTRa及びTEaと示すが、水及び脂肪信号がエコー分離後S−1において非平行となるように選択される請求項6に係る方法。 - (g)前記マスターSSFPシーケンス及びアシストSSFPシーケンスを前記選択されたTR及びTEを用いて適用し画像化対象である前記被検体からMRデータを取得し、
(h)マスタースキャンデータからS0 m及びS−1 mを、及びアシストスキャンデータからS−1 aを有するために前記SSFPデータを分離し、
(i)次の式に従ってS−1 aからフィールド修正マップを生成し、
- TR及びTEはTR=2TEとなるように選択され、その結果水及び脂肪信号は、エコー分離の後全てのエコー成分において著しく直交するように選択される請求項1に係る方法。
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US10/753,342 US7587231B2 (en) | 2004-01-09 | 2004-01-09 | Water fat separated magnetic resonance imaging method and system using steady-state free-precession |
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JP2009178444A (ja) * | 2008-01-31 | 2009-08-13 | Toshiba Corp | 磁気共鳴イメージング装置 |
JP2016120128A (ja) * | 2014-12-25 | 2016-07-07 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 磁気共鳴装置およびプログラム |
CN112763955A (zh) * | 2020-12-31 | 2021-05-07 | 苏州朗润医疗系统有限公司 | 一种基于图割算法的磁共振图像水脂分离方法 |
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US7253620B1 (en) * | 2004-03-08 | 2007-08-07 | United States Of America, As Represented By The Secretary, Department Of Health And Human Services | Spectrally selective suppression with steady-state free precession |
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TW202012951A (zh) | 2018-07-31 | 2020-04-01 | 美商超精細研究股份有限公司 | 低場漫射加權成像 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009178444A (ja) * | 2008-01-31 | 2009-08-13 | Toshiba Corp | 磁気共鳴イメージング装置 |
JP2016120128A (ja) * | 2014-12-25 | 2016-07-07 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 磁気共鳴装置およびプログラム |
CN112763955A (zh) * | 2020-12-31 | 2021-05-07 | 苏州朗润医疗系统有限公司 | 一种基于图割算法的磁共振图像水脂分离方法 |
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