JP7371032B2 - B0マッピング方法 - Google Patents
B0マッピング方法 Download PDFInfo
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- JP7371032B2 JP7371032B2 JP2020571548A JP2020571548A JP7371032B2 JP 7371032 B2 JP7371032 B2 JP 7371032B2 JP 2020571548 A JP2020571548 A JP 2020571548A JP 2020571548 A JP2020571548 A JP 2020571548A JP 7371032 B2 JP7371032 B2 JP 7371032B2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/243—Spatial mapping of the polarizing magnetic field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/443—Assessment of an electric or a magnetic field, e.g. spatial mapping, determination of a B0 drift or dosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/448—Relaxometry, i.e. quantification of relaxation times or spin density
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/561—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
- G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/5608—Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- General Health & Medical Sciences (AREA)
- Radiology & Medical Imaging (AREA)
- Health & Medical Sciences (AREA)
- Signal Processing (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
本発明の目的は、より正確なB0マッピング方法を提供することである。
B0は、主磁場強度の値である。
例えばkx,pにおいて、「p」は「物理的」であることを表し、すなわち、1/長さ(例えば、1/m又は1/mm)の単位を表す。
は、フーリエ変換を示す。
nは、は任意の整数である。
Bwarpは、1/ΔTE(Bm(x)が2つのエコー間の位相差を調べることによって確立されたと仮定する)に対応する。
Claims (11)
- 予め選択された撮像ゾーンにおける静磁場の空間分布を決定するB0マッピング方法であって、
前記撮像ゾーンからの磁気共鳴エコー信号間の位相差の空間分布、及び
前記撮像ゾーンにおけるプロトン密度分布の推定
から前記静磁場の空間分布を計算するステップを含む、B0マッピング方法。 - 前記位相差の空間分布と一致する位相推定磁化率分布を計算するステップと、
推定されるプロトンスピン密度分布と一致するプロトン推定磁化率分布を計算するステップと、
(i)最終磁化率分布と前記位相推定磁化率分布との差、及び(ii)前記最終磁化率分布と前記プロトン推定磁化率分布との差、の両方を最小にするように、前記最終磁化率分布をフィットさせるステップと、
前記最終磁化率分布から前記静磁場の空間分布を計算するステップと、
を含む。請求項1に記載のB0マッピング方法。 - 前記最終磁化率分布は、反復的に計算され、前記反復は、前記最終磁化率分布と前記位相推定磁化率分布との最小差と、前記最終磁化率分布と前記プロトン推定磁化率分布との最小差と、の制約の間で行われる、請求項2に記載のB0マッピング方法。
- 前記推定されるプロトン密度分布は、少なくとも3つのコンポーネントのセグメント化によって形成される、請求項1乃至3のいずれか1項に記載のB0マッピング方法。
- 前記セグメント化は、軟組織、間質ボイド、及び空気を表すコンポーネントを少なくとも含む、請求項4に記載のB0マッピング方法。
- 前記セグメント化は、シリコン、金属、及びセラミックスをそれぞれ表すコンポーネントを更に含む、請求項5に記載のB0マッピング方法。
- 前記推定されるプロトン密度分布が、軟組織、間質ボイド及び空気を表すコンポーネントのうち多くとも3つのコンポーネントのセグメント化によって形成される、請求項1乃至3のいずれか1項に記載のB0マッピング方法。
- 前記反復は、前記静磁場の空間分布の初期推定から初期化される、請求項3及び請求項3を直接的又は間接的に引用する請求項4乃至7のいずれか1項に記載のB0マッピング方法。
- 自己整合最小化プロシージャが、(i)前記最終磁化率分布と前記位相推定磁化率分布との間の差、及び(ii)前記最終磁化率分布と前記プロトン推定磁化率分布との間の差、を最小化する、請求項3、及び請求項2を直接的又は間接的に引用する請求項4乃至7のいずれか1項に記載のB0マッピング方法。
- 予め選択された撮像ゾーンにおける静磁場の空間分布を決定するためのコンピュータプログラムであって、前記撮像ゾーンからの磁気共鳴エコー信号間の位相差の空間分布と、前記撮像ゾーンにおけるプロトン密度分布の推定とから、前記静磁場の空間分布を計算する命令を含む、コンピュータプログラム。
- 請求項10に記載のコンピュータプログラムをインストールした磁気共鳴検査システム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18181333.8A EP3591418A1 (en) | 2018-07-03 | 2018-07-03 | Mri method for b0-mapping |
EP18181333.8 | 2018-07-03 | ||
PCT/EP2019/067117 WO2020007697A1 (en) | 2018-07-03 | 2019-06-27 | Mri method for b0-mapping |
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JP2021529026A JP2021529026A (ja) | 2021-10-28 |
JP7371032B2 true JP7371032B2 (ja) | 2023-10-30 |
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JP2020571548A Active JP7371032B2 (ja) | 2018-07-03 | 2019-06-27 | B0マッピング方法 |
Country Status (5)
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US (1) | US11474170B2 (ja) |
EP (2) | EP3591418A1 (ja) |
JP (1) | JP7371032B2 (ja) |
CN (1) | CN112384817A (ja) |
WO (1) | WO2020007697A1 (ja) |
Citations (6)
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JP2016002464A (ja) | 2014-06-13 | 2016-01-12 | シーメンス アクチエンゲゼルシヤフトSiemens Aktiengesellschaft | 磁気共鳴イメージング方法 |
WO2016076076A1 (ja) | 2014-11-11 | 2016-05-19 | 株式会社日立メディコ | 磁気共鳴イメージング装置および定量的磁化率マッピング方法 |
US20170350951A1 (en) | 2016-06-02 | 2017-12-07 | Wisconsin Alumni Research Foundation | System and method for chemical shift magnetic resonance imaging using magnetization transfer |
JP2018500970A (ja) | 2014-12-04 | 2018-01-18 | ゼネラル・エレクトリック・カンパニイ | 構成材料の分類を改善するための方法およびシステム |
US20180180693A1 (en) | 2015-06-12 | 2018-06-28 | Koninklijke Philips N.V. | Bone mri using b0 inhomogeneity map and a subject magnetic susceptibility map |
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2018
- 2018-07-03 EP EP18181333.8A patent/EP3591418A1/en not_active Withdrawn
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2019
- 2019-06-27 US US17/256,702 patent/US11474170B2/en active Active
- 2019-06-27 EP EP19734757.8A patent/EP3818387A1/en active Pending
- 2019-06-27 CN CN201980044558.0A patent/CN112384817A/zh active Pending
- 2019-06-27 WO PCT/EP2019/067117 patent/WO2020007697A1/en unknown
- 2019-06-27 JP JP2020571548A patent/JP7371032B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2013054718A1 (ja) | 2011-10-12 | 2013-04-18 | 株式会社日立製作所 | 磁気共鳴イメージング装置および磁化率強調画像生成方法 |
JP2016002464A (ja) | 2014-06-13 | 2016-01-12 | シーメンス アクチエンゲゼルシヤフトSiemens Aktiengesellschaft | 磁気共鳴イメージング方法 |
WO2016076076A1 (ja) | 2014-11-11 | 2016-05-19 | 株式会社日立メディコ | 磁気共鳴イメージング装置および定量的磁化率マッピング方法 |
JP2018500970A (ja) | 2014-12-04 | 2018-01-18 | ゼネラル・エレクトリック・カンパニイ | 構成材料の分類を改善するための方法およびシステム |
US20180180693A1 (en) | 2015-06-12 | 2018-06-28 | Koninklijke Philips N.V. | Bone mri using b0 inhomogeneity map and a subject magnetic susceptibility map |
US20170350951A1 (en) | 2016-06-02 | 2017-12-07 | Wisconsin Alumni Research Foundation | System and method for chemical shift magnetic resonance imaging using magnetization transfer |
Also Published As
Publication number | Publication date |
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WO2020007697A1 (en) | 2020-01-09 |
US20210255259A1 (en) | 2021-08-19 |
CN112384817A (zh) | 2021-02-19 |
EP3591418A1 (en) | 2020-01-08 |
EP3818387A1 (en) | 2021-05-12 |
JP2021529026A (ja) | 2021-10-28 |
US11474170B2 (en) | 2022-10-18 |
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