JP2022521277A - ウェーブ符号化を用いたパラレルmrイメージング - Google Patents
ウェーブ符号化を用いたパラレルmrイメージング Download PDFInfo
- Publication number
- JP2022521277A JP2022521277A JP2021549205A JP2021549205A JP2022521277A JP 2022521277 A JP2022521277 A JP 2022521277A JP 2021549205 A JP2021549205 A JP 2021549205A JP 2021549205 A JP2021549205 A JP 2021549205A JP 2022521277 A JP2022521277 A JP 2022521277A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- field gradient
- signal
- imaging
- signal profile
- 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.)
- Pending
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000007689 inspection Methods 0.000 claims abstract description 10
- 238000004590 computer program Methods 0.000 claims abstract description 6
- 230000035945 sensitivity Effects 0.000 claims description 8
- 238000000264 spin echo pulse sequence Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 abstract description 6
- 230000005415 magnetization Effects 0.000 description 9
- 238000013459 approach Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 210000004556 brain Anatomy 0.000 description 3
- 229920013655 poly(bisphenol-A sulfone) Polymers 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000013480 data collection Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012886 linear function Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000011503 in vivo imaging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000012800 visualization Methods 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
- G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
- G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
- G01R33/4835—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices of multiple slices
-
- 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
-
- 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
- G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
- G01R33/56563—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0
-
- 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]
- G01R33/5616—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 gradient refocusing, e.g. EPI
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
ここで、Gy及びGzは、それぞれy及びz方向に沿った最大勾配振幅を示す。上記の理想的な勾配波形は、勾配変調伝達関数(すなわち、渦電流補償)の効果のために補正され、次いで、MRスキャンにおいて適用され得る。また、3D TSEスキャンのためのCarr-Purcell-Meiboom-Gill(CPMG)条件を維持するために、追加の事前位相勾配及びリワインディング勾配が適用されることもできる。
Claims (9)
- MR装置の検査ボリューム内に配置される対象のMR撮像方法であって、
前記対象を撮像シーケンスに曝すことによってMR信号を生成するステップと、
デカルトk空間スキームでMR信号プロファイルを取得するステップであって、各MR信号プロファイルが、読み出し方向に沿った時間的に一定の磁場勾配及び位相符号化方向に沿った正弦波変調される磁場勾配の存在下で取得される、ステップと、
前記磁場勾配の変調スキームを考慮してMR画像を再構成するステップと、
を有し、前記磁場勾配の正弦波変調の周波数が、各MR信号プロファイルの取得中に変化される、方法。 - 前記撮像シーケンスが、2次元、3次元、又はより高い次元のスピンエコーシーケンスであり、又はターボスピンエコーシーケンスである、請求項1に記載の方法。
- 前記撮像シーケンスは、2次元、3次元、又はより高い次元の勾配エコーシーケンスであり、又はターボフィールドエコーシーケンスである、請求項1に記載の方法。
- 前記磁場勾配の正弦波変調の瞬時周波数は、各MR信号プロファイルの前記取得時間隔の前半の間に増加し、前記取得時間隔の後半の間に減少してその初期値に戻る、請求項1乃至3のいずれか1項に記載の方法。
- 前記磁場勾配変調の振幅が、前記MR信号の取得中に変化される、請求項1乃至4のいずれか1項に記載の方法。
- 前記MR信号は、異なる空間感度プロファイルを有する少なくとも2つのRFコイルを通じたサブサンプリングにより取得され、前記MR画像は、SENSE、SMASH、GRAPPA又はパラレルイメージング再構成アルゴリズムを使用して再構成される、請求項1乃至5のいずれか1項に記載の方法。
- 前記撮像シーケンスは、2又はそれより多くの空間的に分離した画像スライスを同時に励起するためのマルチスライスRFパルスを有し、前記異なる画像スライスからのMR信号の寄与が、前記少なくとも2つのRFコイルの空間感度プロファイルに基づいて分離される、請求項1乃至6のいずれか1項に記載の方法。
- 検査ボリューム内に均一な静磁場を生成する少なくとも1つの主磁石コイルと、前記検査ボリューム内の異なる空間方向に切り替え磁場勾配を生成する複数の勾配コイルと、少なくとも1又は複数のRFコイルと、時間的に連続するRFパルス及び切り替え磁場勾配を制御する制御ユニットと、再構成ユニットとを有するMR装置であって、
前記対象を撮像シーケンスに曝すことによってMR信号を生成するステップと、
デカルトk空間スキームでMR信号プロファイルを取得するステップであって、各MR信号プロファイルが、読み出し方向に沿った時間的に一定の磁場勾配及び位相符号化方向に沿った正弦波変調された磁場勾配の存在下で取得される、ステップと、
前記磁場勾配の変調スキームを考慮して、前記取得されたMR信号プロファイルからMR画像を再構成するステップと、
を実行するように構成され、前記磁場勾配の正弦波変調の周波数が、各MR信号プロファイルの取得中に変化される。請求項1乃至7のいずれか1項に記載の方法を実行するMR装置。 - MR装置において実行されるコンピュータプログラムであって、
撮像シーケンスを生成するステップと、
デカルトk空間スキームでMR信号プロファイルを取得するステップであって、各MR信号プロファイルが、読み出し方向に沿った時間的に一定の磁場勾配とスライス及び位相符号化方向に沿った正弦波変調される磁場勾配との存在下で取得され、前記MR信号が、検査ボリューム内で異なる空間感度プロファイルを有する少なくとも2つのRFコイルの組を介してパラレルに受信される、ステップと、
前記磁場勾配の変調スキームを考慮して、前記取得されたMR信号プロファイルからMR画像を再構成するステップと、
を実行する命令を有し、前記磁場勾配の正弦波変調の周波数が各MR信号プロファイルの取得中に変化される、コンピュータプログラム。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201962809779P | 2019-02-25 | 2019-02-25 | |
US62/809,779 | 2019-02-25 | ||
EP19170549.0A EP3730962A1 (en) | 2019-04-23 | 2019-04-23 | Parallel mr imaging using wave-encoding |
EP19170549.0 | 2019-04-23 | ||
PCT/EP2020/054159 WO2020173749A1 (en) | 2019-02-25 | 2020-02-18 | Parallel mr imaging using wave-encoding |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2022521277A true JP2022521277A (ja) | 2022-04-06 |
JPWO2020173749A5 JPWO2020173749A5 (ja) | 2023-02-17 |
Family
ID=69526280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2021549205A Pending JP2022521277A (ja) | 2019-02-25 | 2020-02-18 | ウェーブ符号化を用いたパラレルmrイメージング |
Country Status (4)
Country | Link |
---|---|
US (1) | US11815577B2 (ja) |
EP (1) | EP3931586B1 (ja) |
JP (1) | JP2022521277A (ja) |
WO (1) | WO2020173749A1 (ja) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7301342B2 (en) | 2005-04-15 | 2007-11-27 | Case Western Reserve University | Bunched phase encoding (BPE) |
DE102007035176B4 (de) * | 2007-07-27 | 2010-03-18 | Siemens Ag | Verfahren zur Aufzeichnung und Verarbeitung einer Folge von zeitlich aufeinander folgenden Bilddatensätzen sowie Magnet-Resonanz-Gerät |
DE102013100349B4 (de) * | 2013-01-14 | 2016-05-12 | Siemens Aktiengesellschaft | Echoplanare MR-Bildgebung mit zickzack-artigen k-Raum-Trajektorien |
US10132889B2 (en) * | 2013-05-22 | 2018-11-20 | General Electric Company | System and method for reducing acoustic noise level in MR imaging |
WO2015036340A1 (en) * | 2013-09-10 | 2015-03-19 | Koninklijke Philips N.V. | Metal resistant mr imaging |
CN104714199B (zh) * | 2013-12-17 | 2018-04-24 | 西门子(深圳)磁共振有限公司 | 一种磁共振成像方法和装置 |
-
2020
- 2020-02-18 EP EP20704325.8A patent/EP3931586B1/en active Active
- 2020-02-18 JP JP2021549205A patent/JP2022521277A/ja active Pending
- 2020-02-18 US US17/432,921 patent/US11815577B2/en active Active
- 2020-02-18 WO PCT/EP2020/054159 patent/WO2020173749A1/en unknown
Non-Patent Citations (2)
Title |
---|
BERKIN BILGIC, ET AL.: "Wave-CAIPI for Highly Accelerated 3D Imaging", MAGNETIC RESONANCE IN MEDICINE, vol. 73, JPN6023015134, 2015, pages 2152 - 2162, ISSN: 0005039382 * |
RICHARD D. HOGE, ET AL.: "Density Compensation Functions for Spiral MRI", MRM, vol. 38, JPN6023015133, 1997, pages 117 - 128, XP055025777, ISSN: 0005039383, DOI: 10.1002/mrm.1910380117 * |
Also Published As
Publication number | Publication date |
---|---|
EP3931586A1 (en) | 2022-01-05 |
US11815577B2 (en) | 2023-11-14 |
EP3931586B1 (en) | 2022-06-22 |
US20220155396A1 (en) | 2022-05-19 |
WO2020173749A1 (en) | 2020-09-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3635425B1 (en) | Mr imaging using a stack-of-stars acquisition with variable contrast | |
EP3191862B1 (en) | Zero echo time mr imaging | |
US9159145B2 (en) | Fast dual contrast MR imaging | |
JP2023109791A (ja) | 並列マルチスライスmr撮像 | |
EP3447517A1 (en) | Dixon-type water/fat separation mr imaging | |
CN107810425B (zh) | 消除非t2加权信号贡献的t2加权mr成像 | |
EP3517988A1 (en) | Mr imaging using a stack-of-stars acquisition with intrinsic motion correction | |
WO2018114554A1 (en) | Dixon-type water/fat separation mr imaging | |
JP2019535435A (ja) | プロペラmrイメージング | |
US11959986B2 (en) | MR imaging with spiral acquisition | |
EP2581756A1 (en) | MR imaging using parallel signal acquisition | |
EP3736593A1 (en) | Dual echo steady state mr imaging using bipolar diffusion gradients | |
EP3748385A1 (en) | Optimized k-space profile ordering for 3d radial or spiral mr imaging | |
EP3931588A1 (en) | Epi mr imaging with distortion correction | |
JP2022521277A (ja) | ウェーブ符号化を用いたパラレルmrイメージング | |
EP3432019A1 (en) | Parallel multi-slice mr imaging using signal averaging | |
EP4012434A1 (en) | Dixon-type water/fat separation mr imaging | |
EP3730962A1 (en) | Parallel mr imaging using wave-encoding | |
US20220229139A1 (en) | Multi-echo mr imaging with spiral acquisition | |
EP3792647A1 (en) | Dixon-type water/fat separation mr imaging | |
WO2022096545A1 (en) | Spin echo mr imaging with spiral acquisition |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20230209 |
|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20230209 |
|
A871 | Explanation of circumstances concerning accelerated examination |
Free format text: JAPANESE INTERMEDIATE CODE: A871 Effective date: 20230209 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20230418 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20230714 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20231016 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20231212 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20240305 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20240611 |