JP2007090061A - 3dタイムオブフライト・イメージングにおける同時脂肪抑制、磁化移動コントラスト及び空間飽和の装置及び方法 - Google Patents
3dタイムオブフライト・イメージングにおける同時脂肪抑制、磁化移動コントラスト及び空間飽和の装置及び方法 Download PDFInfo
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- G01R33/5605—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by transferring coherence or polarization from a spin species to another, e.g. creating magnetization transfer contrast [MTC], polarization transfer using nuclear Overhauser enhancement [NOE]
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- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
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- G01R33/5607—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reducing the NMR signal of a particular spin species, e.g. of a chemical species for fat suppression, or of a moving spin species for black-blood imaging
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Abstract
【解決手段】fatsatセグメント、磁化移動セグメント及び空間飽和セグメント(74(a)、74(b)、74(x))を含むパルスシーケンスは、3D収集の内側ループの各反復の開始時点で1つのfatsatパルスが印加される。fatsatパルスの後で、脂肪信号を十分に抑制して一連の撮像セグメント(76(a)、76(b)、76(c)、76(d)、76(y)、76(z))でMRデータが収集される。脂肪からの信号が緩和して前飽和レベルまで戻る前に先ず中心k空間データをサンプリングすることによって有効な脂肪抑制が実現される。各撮像セグメントの直前にMTパルス(78(a)、78(b)、78(x))または空間飽和パルス(74(a)、74(b)、74(x))の一方を配置させ、かつ直後にMTパルスまたは空間飽和パルスの残りの一方を配置させる。
【選択図】図3
Description
4 fatsatパルスセグメント
6 空間飽和パルスセグメント
8 MTパルスセグメント
9 撮像セグメント
10 好ましい磁気共鳴イメージング(MRI)システム
12 オペレータ・コンソール
13 キーボードその他の入力デバイス
14 制御パネル
16 表示スクリーン
18 リンク
20 独立のコンピュータ・システム
20a バックプレーン
22 画像プロセッサ・モジュール
24 CPUモジュール
26 メモリ・モジュール
28 ディスク記憶装置
30 テープ駆動装置
32 独立のシステム制御部
32a バックプレーン
34 高速シリアルリンク
36 CPUモジュール
38 パルス発生器モジュール
40 シリアルリンク
42 傾斜増幅器組
44 生理学的収集制御器
46 スキャン室インタフェース回路
48 患者位置決めシステム
50 傾斜コイル・アセンブリ
52 マグネット・アセンブリ
54 偏向マグネット
56 全身用RFコイル
58 送受信器モジュール
60 RF増幅器
62 送信/受信スイッチ
64 前置増幅器
66 メモリ・モジュール
68 アレイ・プロセッサ
70 パルスシーケンス
72 fatsatパルスセグメント
74(a) 空間飽和パルスセグメント
74(b) 空間飽和パルスセグメント
74(x) 空間飽和パルスセグメント
76(a) 撮像セグメント
76(b) 撮像セグメント
76(c) 撮像セグメント
76(d) 撮像セグメント
76(y) 撮像セグメント
76(z) 撮像セグメント
78(a) MTパルスセグメント
78(b) MTパルスセグメント
78(x) MTパルスセグメント
Claims (10)
- 撮像対象の周りに偏向磁場を印加するようにマグネット(54)のボアの周りに位置決めした複数の傾斜コイル(50)、並びにMR画像を収集するためにRFコイル・アセンブリ(56)にRF信号を送信するようにパルスモジュール(58)によって制御を受けるRF送受信器システム及びRFスイッチ(62)と、
コンピュータ・プログラムをその上に保存して有するコンピュータ読み取り可能記憶媒体であって、コンピュータ(20)によって実行した際に該コンピュータ(20)に対して、
(A)空間飽和パルス(74(a)、74(b)、74(x))を印加させ不要なスピンを飽和させること、
(B)空間飽和パルス(74(a)、74(b)、74(x))の印加後に撮像セグメント(76(a)、76(b)、76(c)、76(d)、76(y)、76(z))を印加させ周波数エンコード(kx)次元方向で1本のk空間ラインを収集させること、
(C)撮像パルス(76(a)、76(b)、76(c)、76(d)、76(y)、76(z))の印加後に磁化移動(MT)パルス(78(a)、78(b)、78(x))を印加させコントラストを強調させること、並びに
(D)MTパルス(78(a)、78(b)、78(x))の印加後に撮像セグメント(76(a)、76(b)、76(c)、76(d)、76(y)、76(z))を印加させ周波数エンコード(kx)次元方向で別のk空間ラインを収集させること、
を行わせる命令を含んだコンピュータ読み取り可能記憶媒体と、
を備える磁気共鳴(MR)装置。 - 前記コンピュータ(20)はさらに、3D k空間収集の内側ループの各反復ごとに(A)〜(D)を繰り返すようにプログラムされている、請求項1に記載のMR装置。
- 前記コンピュータ(20)はさらに、内側ループの各反復ごとに、中心−外の収集順序で各k空間ラインを満たすようにプログラムされている、請求項2に記載のMR装置。
- 前記コンピュータ(20)はさらに、前記中心−外収集順序を外側k空間データの収集前に中心k空間データを収集することによって実現するようにプログラムされている、請求項3に記載のMR装置。
- 前記コンピュータ(20)はさらに、前記中心−外収集順序をkz次元方向の各縦列を収集順序:(0、−1、1、−2、2、・・・、kzmax−1、−kzmax)で満たすように実現するようにプログラムされている、中心−外収集順序請求項4に記載のMR装置。
- 前記コンピュータ(20)はさらに、3D収集の内側ループの各反復の開始時点で脂肪からの信号を抑制させる単一の脂肪飽和パルスを印加するようにプログラムされている、請求項1に記載のMR装置。
- 前記コンピュータ(20)に対してさらに、脂肪からの信号が緩和して前飽和レベルまで戻る前に中心k空間データのサンプリングを実行させている、請求項6に記載のMR装置。
- 前記コンピュータ(20)はさらに、3Dタイムオブフライト(TOF)MRアンギオグラフィ・データを収集するようにプログラムされている、請求項6に記載のMR装置。
- 前記コンピュータ(20)はさらに、フロー誘導性の信号ボイド・アーチファクトが実質的に存在しないMR画像を再構成するようにプログラムされている、請求項8に記載のMR装置。
- 前記コンピュータ(20)に対してさらに、同時脂肪抑制、MTコントラスト及び静脈または動脈抑制を伴って対象の所与のスライスからのMRデータの収集を実行させている、請求項6に記載のMR装置。
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US11/162,848 | 2005-09-26 | ||
US11/162,848 US7330028B2 (en) | 2005-09-26 | 2005-09-26 | Apparatus and method of simultaneous fat suppression, magnetization transfer contrast, and spatial saturation for 3D time-of-flight imaging |
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JP2007090061A true JP2007090061A (ja) | 2007-04-12 |
JP2007090061A5 JP2007090061A5 (ja) | 2009-10-15 |
JP4980013B2 JP4980013B2 (ja) | 2012-07-18 |
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US7635977B2 (en) * | 2006-04-06 | 2009-12-22 | Catholic Healthcare West, California Nonprofit Public Benefit Corporation | MR imaging with an RF pulse producing reduced magnetization transfer |
DE102007037657B4 (de) * | 2007-08-09 | 2009-05-14 | Siemens Ag | Verfahren zur k-Raum-Aufteilung bei der Aufzeichnung von Messdaten mittels Magnet- Resonanz- Technik und Magnet- Resonanz- Gerät |
US8068655B2 (en) * | 2007-10-02 | 2011-11-29 | Siemens Aktiengesellschaft | Method and system for vessel enhancement and artifact reduction in TOF MR angiography of brain |
US10324033B2 (en) | 2012-07-20 | 2019-06-18 | Samsung Electronics Co., Ltd. | Image processing apparatus and method for correcting an error in depth |
US9322894B2 (en) | 2012-08-07 | 2016-04-26 | General Electric Company | Multiple excitation blade acquisition for motion correction in magnetic resonance imaging |
IN2013KO01322A (ja) * | 2013-11-22 | 2015-05-29 | Siemens Medical Solutions | |
US10203388B2 (en) * | 2016-01-04 | 2019-02-12 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
US10684343B2 (en) * | 2017-05-31 | 2020-06-16 | Canon Medical Systems Corporation | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
CN109330594B (zh) * | 2018-08-24 | 2022-05-27 | 上海联影医疗科技股份有限公司 | 获取饱和带的参数的方法、波谱成像方法、系统和介质 |
US10871537B1 (en) * | 2019-06-19 | 2020-12-22 | GE Precision Healthcare LLC | Systems and methods for background suppression in time-of-flight magnetic resonance angiography |
DE102021201676A1 (de) * | 2021-02-23 | 2022-08-25 | Siemens Healthcare Gmbh | Korrektur von TOF-MR-Daten |
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JP2004333412A (ja) * | 2003-05-12 | 2004-11-25 | Hitachi Medical Corp | 磁気共鳴イメージング装置 |
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WO1993018415A1 (en) * | 1992-03-09 | 1993-09-16 | University Of Washington | Image neurography and diffusion anisotropy imaging |
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JP3995542B2 (ja) * | 2002-06-28 | 2007-10-24 | 東芝医用システムエンジニアリング株式会社 | 磁気共鳴イメージング装置及び磁気共鳴イメージングのデータ収集方法 |
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