JP2020533051A - 拡散強調磁気共鳴測定を実行するための方法 - Google Patents
拡散強調磁気共鳴測定を実行するための方法 Download PDFInfo
- Publication number
- JP2020533051A JP2020533051A JP2020512717A JP2020512717A JP2020533051A JP 2020533051 A JP2020533051 A JP 2020533051A JP 2020512717 A JP2020512717 A JP 2020512717A JP 2020512717 A JP2020512717 A JP 2020512717A JP 2020533051 A JP2020533051 A JP 2020533051A
- Authority
- JP
- Japan
- Prior art keywords
- gradient
- time
- diffusion
- coding
- magnetic resonance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005259 measurement Methods 0.000 title description 10
- 230000036962 time dependent Effects 0.000 claims abstract description 15
- 238000002595 magnetic resonance imaging Methods 0.000 claims abstract description 14
- 238000002597 diffusion-weighted imaging Methods 0.000 claims abstract description 10
- 238000009792 diffusion process Methods 0.000 claims description 15
- 238000005457 optimization Methods 0.000 claims description 11
- 238000013016 damping Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000000264 spin echo pulse sequence Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 3
- 238000002592 echocardiography Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 11
- 230000006870 function Effects 0.000 description 9
- 239000000523 sample Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 230000010354 integration Effects 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000001472 pulsed field gradient Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 108091026890 Coding region Proteins 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 102100030852 Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Human genes 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 239000012472 biological sample Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001574 biopsy Methods 0.000 description 1
- 210000005013 brain tissue Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
- G01R33/56341—Diffusion imaging
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
-
- 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
- G01R33/4818—MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
- G01R33/482—MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space using a Cartesian trajectory
- G01R33/4822—MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space using a Cartesian trajectory in three dimensions
-
- 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
- G01R33/50—NMR imaging systems based on the determination of relaxation times, e.g. T1 measurement by IR sequences; T2 measurement by multiple-echo sequences
-
- 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
- G01R33/5611—Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE
-
- 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]
- G01R33/5617—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] using RF refocusing, e.g. RARE
-
- 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
- G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
- G01R33/56572—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of a gradient magnetic field, e.g. non-linearity of a gradient magnetic field
- G01R33/56581—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of a gradient magnetic field, e.g. non-linearity of a gradient magnetic field due to Maxwell fields, i.e. concomitant fields
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- High Energy & Nuclear Physics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Health & Medical Sciences (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Vascular Medicine (AREA)
- Nonlinear Science (AREA)
- Medical Informatics (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Biophysics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
ここで、Δkは、Δk=n/FOVによって与えられる2つの取得されたk空間線の間の距離であり、ここで、nは、パラレル画像ファクタ(parallel imaging factor)であり、FOVは視野であり、及び
ここで、Δtは、2つの連続するk空間線の中心部エコーの取得の間の時間である。
理論
マクスウェル方程式は、MRIスキャナの勾配コイルによって生成される線形場勾配が空間的に依存する追加の場(付随する場)に伴って起こされることを示している(Norris and Hutchison, 1990; Bernstein et al, 1998; Zhou et al., 1998; Meier et al, 2008)。場へのそれらの寄与は、以下のアイソセンタを原点とするデカルト座標x、y、及びzの磁場の拡張によって近似でき、
波形オプティマイザは、NOWツールボックスを使用して実装され、これは、http://github.com/jsjo/NOW(コミットID6c69462の)からダウンロードされ得る。以下の修正は、所望の勾配波形を生成させることができ得る。
この制限は、勾配波形とそれ自体との外積の成分を最小化するために使用される。さらに、第2の部分の積分の符号を変更することにより、リフォーカスパルスの効果が考慮される。2つの間隔、すなわち、リフォーカスの前後の勾配波形は、pre及びpоstの指標で示され、勾配が適用される軸は、x、y、及びzで示される。各成分の大きさを最小化するために、最適化では二乗和が考慮され、tolMaxwellで示される許容誤差レベルまで下がる。したがって、オプティマイザの新しい部分は、以下によれば、制限(const)の形式を取る、
制限を適用するためには、最小化関数は、許容誤差を設定される必要がある。したがって、fminconの呼び出しは、以下によれば、problem.tolMaxwellで拡張される。
追加の積分制限が波形オプティマイザに実装された。勾配振幅に対するユークリッド若しくはマックスノルム(Max norms)の使用を含む、又は付随する勾配制限を伴う場合と伴わない場合との4つの波形が生成された。これら波形は、図1−4に示される。図1−2は、新しい制限を適用せずに最適化された波形を示している(‘non-comp’)。その結果、
本発明の概念によれば、拡散磁気共鳴画像(dMRI)のための方法が提供される。この方法は、図5に概略的に示されているMRIスキャナ1を使用して実行され得る。図6を参照すると、dMRI測定は、1つ又は複数の時間依存の磁場勾配
次に、上記で参照されている参照文献のリストを示す。
Bernstein, M. A., Zhou, X. J., Polzin, J. A., King, K. F., Ganin, A., Pelc, N. J., & Glover, G. H. (1998). Concomitant gradient terms in phase contrast MR: analysis and correction. Magn Reson Med, 39(2), 300−308.
Lasic, S., Szczepankiewicz, F., Eriksson, S., Nilsson, M. & Topgaard, D. 2014. Microanisotropy imaging: quantification of microscopic diffusion anisotropy and orientational order parameter by diffusion MRI with magic−angle spinning of the q−vector. Frontiers in Physics, 2, 11.
Meier, C., Zwanger, M., Feiweier, T., & Porter, D. (2008). Concomitant field terms for asymmetric gradient coils: consequences for diffusion, flow, and echo−planar imaging. Magn Reson Med, 60(1), 128−134. http://doi.org/10.1002/mrm.21615
Nilsson, M., van Westen, D., Stahlberg, F., Sundgren, P. C., & Latt, J. (2013). The role of tissue microstructure and water exchange in biophysical modelling of diffusion in white matter. Magnetic Resonance Materials in Physics, Biology and Medicine, 26(4), 345−370.
Norris, D. G. & Hutchison, J. M. S. 1990. Concomitant magnetic field gradients and their effects on imaging at low magnetic field strengths. Magnetic Resonance Imaging, 8, 33−37.
Sjolund, J., Szczepankiewicz, F., Nilsson, M., Topgaard, D., Westin, C. F. & Knutsson, H. 2015. Constrained optimization of gradient waveforms for generalized diffusion encoding. Journal of Magnetic Resonance, 261, 157−168.
Szczepankiewicz, F., Van Westen, D., Englund, E., Westin, C. F., Stahlberg, F., Latt, J., Sundgren, P. C. & Nilsson, M. 2016. The link between diffusion MRI and tumor heterogeneity: Mapping cell eccentricity and density by diffusional variance decomposition (DIVIDE). Neuroimage, 142, 522−532.
Westin, C. −F., Knutsson, H., Pasternak, O., Szczepankiewicz, F., Ozarslan, E., van Westen, D., et al. (2016). Q−space trajectory imaging for multidimensional diffusion MRI of the human brain. NeuroImage, 135(C), 345−362.
Zhou, X. J., Du, Y. P., Bernstein, M. A., Reynolds, H. G., Maier, J. K. & Polzin, J. A. 1998. Concomitant magnetic−field−induced artifacts in axial echo planar imaging. Magnetic Resonance in Medicine, 39, 596-605.
Claims (15)
- h(t)は、0<t<TE/2で正であり、TE/2<t<TEで負である時間の関数である、請求項1に記載の方法。
- 前記磁場勾配Gは、スピンエコーシーケンスの一部を形成する、請求項1又は2に記載の方法。
- 前記符号化勾配Gは、等方性の拡散符号化を引き起こすように適合される、請求項1乃至4のいずれか1項に記載の方法。
- 磁気共鳴画像スキャナの勾配コイルによって、時間依存の磁場勾配
ここで、
ここで、Δkは、Δk=n/FOVによって与えられる2つの取得されたk空間線の間の距離であり、ここで、nは、パラレル画像ファクタであり、FOVは視野であり、及び、
ここで、Δtは、2つの連続するk空間線の中心部エコーの取得の間の時間である、拡散強調磁気共鳴画像のための方法。 - 前記磁場勾配Gは、スピンエコーシーケンスの一部を形成する、請求項6又は7に記載の方法。
- 前記符号化勾配Gは、等方性の拡散符号化を引き起こすように適合される、請求項6乃至9のいずれか1項に記載の方法。
- 前記勾配Gは、mがゼロであるような勾配である、請求項11に記載の方法。
- 前記符号化勾配Gは、等方性の拡散符号化を引き起こすように適合される、請求項11乃至13のいずれか1項に記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201762555165P | 2017-09-07 | 2017-09-07 | |
US62/555,165 | 2017-09-07 | ||
PCT/SE2018/050901 WO2019050462A1 (en) | 2017-09-07 | 2018-09-07 | METHOD FOR MAKING DIFFUSION WEIGHTED MAGNETIC RESONANCE MEASUREMENTS |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2020533051A true JP2020533051A (ja) | 2020-11-19 |
JP7512190B2 JP7512190B2 (ja) | 2024-07-08 |
Family
ID=65634235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2020512717A Active JP7512190B2 (ja) | 2017-09-07 | 2018-09-07 | 拡散強調磁気共鳴測定を実行するための方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US11525880B2 (ja) |
EP (1) | EP3679388A4 (ja) |
JP (1) | JP7512190B2 (ja) |
KR (1) | KR20200087749A (ja) |
CN (1) | CN111615637B (ja) |
AU (1) | AU2018329432A1 (ja) |
BR (1) | BR112020004488A8 (ja) |
CA (1) | CA3074649A1 (ja) |
WO (1) | WO2019050462A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE543292C2 (en) * | 2019-04-26 | 2020-11-17 | Cr Dev Ab | A method of performing diffusion weighted magnetic resonance measurements |
KR20220009258A (ko) | 2020-07-15 | 2022-01-24 | 주식회사 엘지에너지솔루션 | 배터리 관리 장치, 배터리 팩, 에너지 저장 시스템 및 배터리 관리 방법 |
US11768264B2 (en) * | 2021-04-30 | 2023-09-26 | Case Western Reserve University | System and method for magnetic resonance fingerprinting with relaxation and diffusion data acquisition |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07184875A (ja) * | 1993-12-27 | 1995-07-25 | Hitachi Ltd | 核磁気共鳴を用いた検査方法および検査装置 |
JPH09285457A (ja) * | 1996-04-25 | 1997-11-04 | Toshiba Corp | 磁気共鳴イメージング装置 |
JP2014166219A (ja) * | 2013-02-28 | 2014-09-11 | Ge Medical Systems Global Technology Co Llc | 磁気共鳴装置 |
US20160291113A1 (en) * | 2015-03-30 | 2016-10-06 | Siemens Aktiengesellschaft | Method and magnetic resonance apparatus for speed-compensated diffusion-based diffusion imaging |
JP2017507698A (ja) * | 2014-02-10 | 2017-03-23 | シーアール ディベロップメント アーベー | サンプルにおける等方性拡散及び/又は異方性拡散を定量化するための方法 |
JP2017517325A (ja) * | 2014-06-12 | 2017-06-29 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | 拡散強調磁気共鳴イメージングを用いて組織内の鉄の量を定量化するmri方法 |
WO2017116300A1 (en) * | 2015-12-29 | 2017-07-06 | Cr Development Ab | Method of extracting information about a sample by nuclear magnetic resonance measurements |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3525007B2 (ja) * | 1996-03-28 | 2004-05-10 | 株式会社日立メディコ | 磁気共鳴イメージング装置 |
US6150815A (en) * | 1997-04-10 | 2000-11-21 | The University Of British Columbia | Method of correcting for magnetic field inhomogeneity in magnetic resonance imaging |
WO2010074059A1 (ja) * | 2008-12-26 | 2010-07-01 | 株式会社 日立メディコ | 磁気共鳴イメージング装置及び読み出し傾斜磁場誤差補正方法 |
DE102009019895B4 (de) * | 2009-05-04 | 2011-05-12 | Siemens Aktiengesellschaft | Verfahren und Magnetresonanzanlage zur diffusionsgewichteten Aufnahme von MR-Signalen |
SE0950363A1 (sv) * | 2009-05-22 | 2010-06-29 | Cr Dev Ab | Metod och system för magnetisk resonanstomografi, samt användning därav. |
WO2013025487A1 (en) | 2011-08-12 | 2013-02-21 | The United States Of America, As Represented By The Secretary, Dpt Of Health And Human Services | Spin echo sequences for diffusion weighted imaging of moving media |
DE102011082009B3 (de) | 2011-09-01 | 2013-02-28 | Siemens Aktiengesellschaft | Schichtselektive Detektion und Korrektur von fehlerhaften Magnetresonanz-Bilddaten in Schicht-Multiplexing-Messsequenzen |
CN104363829B (zh) * | 2012-05-23 | 2017-07-21 | 皇家飞利浦有限公司 | 多回波presto |
US9513358B2 (en) * | 2013-03-12 | 2016-12-06 | Vaposun Inc. | Method and apparatus for magnetic resonance imaging |
US9897678B2 (en) | 2013-04-19 | 2018-02-20 | General Electric Company | Magnetic resonance imaging data correction methods and systems |
US9903930B2 (en) * | 2013-11-06 | 2018-02-27 | King's College London | RF pulses for magnetic resonance |
CN105433944B (zh) | 2014-07-31 | 2018-07-03 | 西门子公司 | 用于获取对象的磁共振数据的方法及装置 |
WO2016180983A1 (en) | 2015-05-13 | 2016-11-17 | Koninklijke Philips N.V. | Multi-echo mri with correction of concomitant gradient-induced phase errors |
US10613174B2 (en) | 2015-10-29 | 2020-04-07 | Siemens Healthcare Gmbh | Method and magnetic resonance apparatus for maxwell compensation in simultaneous multislice data acquisitions |
EP3408679A4 (en) | 2016-01-25 | 2019-09-11 | The Regents of The University of California | OPTIMIZED WEIGHTED DIFFUSION IMAGING SYSTEM AND METHOD |
DE102016200975A1 (de) | 2016-01-25 | 2017-07-27 | Siemens Healthcare Gmbh | Diffusionsgewichtete Magnetresonanz-Bildgebung |
EP3441781A1 (de) * | 2017-08-11 | 2019-02-13 | Siemens Healthcare GmbH | Beschleunigte magnetresonanz-messung |
-
2018
- 2018-09-07 EP EP18854163.5A patent/EP3679388A4/en active Pending
- 2018-09-07 BR BR112020004488A patent/BR112020004488A8/pt not_active Application Discontinuation
- 2018-09-07 WO PCT/SE2018/050901 patent/WO2019050462A1/en unknown
- 2018-09-07 CA CA3074649A patent/CA3074649A1/en active Pending
- 2018-09-07 AU AU2018329432A patent/AU2018329432A1/en not_active Abandoned
- 2018-09-07 JP JP2020512717A patent/JP7512190B2/ja active Active
- 2018-09-07 US US16/645,569 patent/US11525880B2/en active Active
- 2018-09-07 CN CN201880055673.3A patent/CN111615637B/zh active Active
- 2018-09-07 KR KR1020207009466A patent/KR20200087749A/ko not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07184875A (ja) * | 1993-12-27 | 1995-07-25 | Hitachi Ltd | 核磁気共鳴を用いた検査方法および検査装置 |
JPH09285457A (ja) * | 1996-04-25 | 1997-11-04 | Toshiba Corp | 磁気共鳴イメージング装置 |
JP2014166219A (ja) * | 2013-02-28 | 2014-09-11 | Ge Medical Systems Global Technology Co Llc | 磁気共鳴装置 |
JP2017507698A (ja) * | 2014-02-10 | 2017-03-23 | シーアール ディベロップメント アーベー | サンプルにおける等方性拡散及び/又は異方性拡散を定量化するための方法 |
JP2017517325A (ja) * | 2014-06-12 | 2017-06-29 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | 拡散強調磁気共鳴イメージングを用いて組織内の鉄の量を定量化するmri方法 |
US20160291113A1 (en) * | 2015-03-30 | 2016-10-06 | Siemens Aktiengesellschaft | Method and magnetic resonance apparatus for speed-compensated diffusion-based diffusion imaging |
WO2017116300A1 (en) * | 2015-12-29 | 2017-07-06 | Cr Development Ab | Method of extracting information about a sample by nuclear magnetic resonance measurements |
Non-Patent Citations (3)
Title |
---|
FILIP SZCZEPANKIEWICZ ほか9名: "Quantification of microscopic diffusion anisotropy disentangles effects of orientation dispersion fr", NEUROIMAGE, vol. 104, JPN6022035974, 1 January 2015 (2015-01-01), pages 241 - 252, ISSN: 0004862163 * |
MATT A. BERNSTEIN, ET AL.: "Concomitant Gradient Terms in Phase Contrast MR: Analysis and Correction", MRM, vol. 39, JPN6023018476, 1998, pages 300 - 308, XP000734742, ISSN: 0005051973 * |
丸 武史: "「拡散をもう一度振り返る」 ~今、振り返る基礎 Motion Probing Gradient: MPG ~", 埼玉放射線, vol. 62, no. 2, JPN6023018475, 2016, pages 122 - 127, ISSN: 0005051974 * |
Also Published As
Publication number | Publication date |
---|---|
CN111615637A (zh) | 2020-09-01 |
WO2019050462A1 (en) | 2019-03-14 |
EP3679388A4 (en) | 2021-09-29 |
AU2018329432A1 (en) | 2020-03-12 |
EP3679388A1 (en) | 2020-07-15 |
BR112020004488A2 (pt) | 2020-09-08 |
KR20200087749A (ko) | 2020-07-21 |
US11525880B2 (en) | 2022-12-13 |
BR112020004488A8 (pt) | 2023-02-14 |
JP7512190B2 (ja) | 2024-07-08 |
CA3074649A1 (en) | 2019-03-14 |
CN111615637B (zh) | 2022-06-14 |
US20200284865A1 (en) | 2020-09-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Setsompop et al. | Pushing the limits of in vivo diffusion MRI for the Human Connectome Project | |
Tan et al. | High slew‐rate head‐only gradient for improving distortion in echo planar imaging: preliminary experience | |
Wilm et al. | Higher order reconstruction for MRI in the presence of spatiotemporal field perturbations | |
Jezzard | Correction of geometric distortion in fMRI data | |
US10488479B2 (en) | MRI apparatus and image processing apparatus | |
Herrler et al. | Fast online‐customized (FOCUS) parallel transmission pulses: a combination of universal pulses and individual optimization | |
Hrabe et al. | Principles and limitations of NMR diffusion measurements | |
JP7512190B2 (ja) | 拡散強調磁気共鳴測定を実行するための方法 | |
Szczepankiewicz et al. | Motion‐compensated gradient waveforms for tensor‐valued diffusion encoding by constrained numerical optimization | |
US9824448B2 (en) | Method for acquiring a magnetic field inhomogeneity value and distortion correction method for magnetic resonance imaging system | |
US9903930B2 (en) | RF pulses for magnetic resonance | |
US9753108B2 (en) | Magnetic resonance imaging method for at least two separate radio-frequency transmit coils with time-delayed slice-selective excitation pulses | |
EP2847607B1 (en) | Mri pulse sequence for isotropic diffusion weighting | |
Mueller et al. | Eddy current compensated double diffusion encoded (DDE) MRI | |
Vellmer et al. | Comparative analysis of isotropic diffusion weighted imaging sequences | |
WO2012138902A1 (en) | B0-based modulation of b1 excitation in mri | |
Zheng et al. | Improved large tip angle parallel transmission pulse design through a perturbation analysis of the bloch equation | |
US9500733B2 (en) | Method and apparatus for obtaining main magnetic field information and radio pulse related information in a magnetic resonance imaging system with different flip angles | |
de Sousa et al. | Flow effects in long-range dipolar field MRI | |
CN113625211A (zh) | 借助磁共振装置进行扩散成像的方法、磁共振装置、计算机程序和电子可读的数据载体 | |
Hsu | Flip-angle profile of slice-selective excitation and the measurement of the MR longitudinal relaxation time with steady-state magnetization | |
WO2019241459A1 (en) | System and methods for t1 and t2 weighted magnetic resonance imaging | |
Middione et al. | Pre‐excitation gradients for eddy current nulled convex optimized diffusion encoding (Pre‐ENCODE) | |
Deichmann | Optimized RF excitation for anatomical brain imaging of the occipital lobe using the 3D MDEFT sequence and a surface transmit coil | |
Magin et al. | Comparison of analytical and numerical models for anomalous diffusion in the Bloch-Torrey equation |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20210903 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20220817 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20220830 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20221114 |
|
A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A711 Effective date: 20221124 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20230227 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20230509 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20230619 |
|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20240116 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20240502 |
|
A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20240513 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20240528 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20240626 |