JP2021514710A - マルチグラジエントエコーシーケンスを使用したディクソンmrイメージング - Google Patents
マルチグラジエントエコーシーケンスを使用したディクソンmrイメージング Download PDFInfo
- Publication number
- JP2021514710A JP2021514710A JP2020544217A JP2020544217A JP2021514710A JP 2021514710 A JP2021514710 A JP 2021514710A JP 2020544217 A JP2020544217 A JP 2020544217A JP 2020544217 A JP2020544217 A JP 2020544217A JP 2021514710 A JP2021514710 A JP 2021514710A
- Authority
- JP
- Japan
- Prior art keywords
- echo
- map
- image
- signal
- imaging
- 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 53
- 238000000034 method Methods 0.000 claims abstract description 46
- 230000005284 excitation Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000033001 locomotion Effects 0.000 claims abstract description 15
- RGCLLPNLLBQHPF-HJWRWDBZSA-N phosphamidon Chemical compound CCN(CC)C(=O)C(\Cl)=C(/C)OP(=O)(OC)OC RGCLLPNLLBQHPF-HJWRWDBZSA-N 0.000 claims abstract description 9
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 8
- 238000004590 computer program Methods 0.000 claims abstract description 5
- 238000007689 inspection Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 9
- 238000002592 echocardiography Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 2
- 238000000264 spin echo pulse sequence Methods 0.000 claims description 2
- 230000002123 temporal effect Effects 0.000 claims description 2
- 238000001472 pulsed field gradient Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000002362 mulch Substances 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 description 10
- 230000003902 lesion Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013507 mapping Methods 0.000 description 3
- 238000013480 data collection Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000004884 grey matter Anatomy 0.000 description 2
- 210000004185 liver Anatomy 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- 230000000241 respiratory effect Effects 0.000 description 2
- 210000000278 spinal cord Anatomy 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 210000004885 white matter Anatomy 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229940039231 contrast media Drugs 0.000 description 1
- 239000002872 contrast media Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003875 gradient-accelerated spectroscopy Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 201000006417 multiple sclerosis Diseases 0.000 description 1
- 238000009206 nuclear medicine Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000012800 visualization Methods 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
- G01R33/4828—Resolving the MR signals of different chemical species, e.g. water-fat 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
- G01R33/54—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
-
- 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
-
- 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
-
- 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
- G01R33/4824—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 non-Cartesian trajectory
-
- 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
-
- 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]
-
- 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
- G01R33/56518—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to eddy currents, e.g. caused by switching of the gradient magnetic field
-
- 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
- G01R33/56527—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to chemical shift effects
-
- 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
- G01R33/56554—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by acquiring plural, differently encoded echo signals after one RF excitation, e.g. correction for readout gradients of alternating polarity in 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
- G01R33/565—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
- G01R33/4816—NMR imaging of samples with ultrashort relaxation times such as solid samples, e.g. MRI using ultrashort TE [UTE], single point imaging, constant time 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
- G01R33/54—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
-
- 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
- G01R33/5619—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 by temporal sharing of data, e.g. keyhole, block regional interpolation scheme for k-Space [BRISK]
-
- 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
- G01R33/56308—Characterization of motion or flow; Dynamic 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
- G01R33/54—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
- G01R33/567—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution gated by physiological signals, i.e. synchronization of acquired MR data with periodical motion of an object of interest, e.g. monitoring or triggering system for cardiac or respiratory gating
- G01R33/5676—Gating or triggering based on an MR signal, e.g. involving one or more navigator echoes for motion monitoring and correction
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- High Energy & Nuclear Physics (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Signal Processing (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
−物体を、RF励起パルス及び切り替え磁場勾配を含むイメージングシーケンスに当てるステップであって、複数のエコー信号が各RF励起パルスの後に異なるエコー時間で生成される、ステップと、
−異なるエコー時間が提供され、前記イメージングシーケンスがx/y方向及び/又はz方向における磁場勾配ブリップを含んで、ラジアル又はスパイラルk空間軌跡に沿ってエコー信号データを収集するステップと、
−ディクソンアルゴリズムを使用して、水及び脂肪からのエコー信号への信号寄与を分離し、B0マップ及び/又は見かけの横緩和時間マップ(T2 *マップ)を推定するステップと、
−エコー信号データ、B0マップ及び/又はT2 *マップから、指定のコントラストの画像を合成するステップとを含む。
Claims (16)
- MRデバイスの検査ボリューム内に置かれた物体のMRイメージング方法であって、
前記物体を、RF励起パルス及び切り替え磁場勾配を含むイメージングシーケンスに当てるステップであって、複数のエコー信号が各RF励起パルスの後に異なるエコー時間で生成される、当てるステップと、
異なるエコー時間が提供され、前記イメージングシーケンスがx/y方向及び/又はz方向における磁場勾配ブリップを含んで、ラジアル又はスパイラルk空間軌跡に沿ってエコー信号データを収集するステップと、
収集された前記エコー信号データから指定のコントラストのT2 *強調信号を合成するステップであって、実効エコー時間は、選択されたエコー数、最初のエコー時間及びエコー間隔並びにT2 *によって間接的に決定される、合成するステップと、
ディクソンアルゴリズムを使用して、水及び脂肪からの信号寄与を分離し、B0マップ及び/又は見かけの横緩和時間マップ(T2 *マップ)を推定するステップと、
合成された前記T2 *強調信号、前記B0マップ及び/又は前記T2 *マップから、指定のコントラストの画像を再構成するステップと、
を含む、方法。 - 前記ラジアル又はスパイラルk空間軌跡の回転角度は、収集中に黄金角度だけ増分される、請求項1に記載の方法。
- 前記エコー信号の位相エンコードは、z方向に変化し、及び/又は、前記ラジアル又はスパイラルk空間軌跡の回転角度は、kx/ky方向に増分される、請求項1又は2に記載の方法。
- kx/ky方向におけるサンプリング密度は、k空間の中央部分が周辺部分よりも密にサンプリングされるようにkzの関数として変化する、請求項1から3のいずれか一項に記載の方法。
- マルチエコー収集の1つ以上のショットを使用して、動き補正に使用される固有の画像ナビゲーション信号を抽出する、請求項1から4のいずれか一項に記載の方法。
- 各エコー時間について収集された前記エコー信号データから単一エコー画像が再構成される、請求項1から5のいずれか一項に記載の方法。
- 前記単一エコー画像を再構成するために、k空間強調画像コントラストフィルタが使用される、請求項1から6のいずれか一項に記載の方法。
- 前記単一エコー画像を再構成するために又は水/脂肪分離において、圧縮センシングが使用される、請求項1から7のいずれか一項に記載の方法。
- 前記エコー信号のサブセットが超短エコー時間で生成される、請求項1から8のいずれか一項に記載の方法。
- 前記指定のコントラストの画像を合成するステップは、
収集された前記エコー信号データからゼロエコー時間強度画像を計算するステップと、
前記ゼロエコー時間強度画像の各ボクセルに重みを適用するステップと、
を含み、
前記重みは、前記T2 *マップから導出される、請求項1から9のいずれか一項に記載の方法。 - 前記イメージングシーケンスは、フィールドエコーシーケンス又はスピンエコーシーケンスである、請求項1から10のいずれか一項に記載の方法。
- 前記エコー信号の収集中に、前記物体の動きが検出され、対応する動き補償が、単一エコー画像を再構成するステップ、水及び脂肪からの信号寄与を分離するステップ、又は、前記指定のコントラストの画像を合成するステップにおいて適用される、請求項1から11のいずれか一項に記載の方法。
- 合成された画像は、
収集された前記エコー信号データからの単一エコー画像の強度再構成、及び、
二乗和アルゴリズムによる前記単一エコー画像の組み合わせ、
によって生成される画像と似ている、請求項1から12のいずれか一項に記載の方法。 - 収集された前記エコー信号データからフローマップが導出され、前記フローマップは、前記画像を合成するステップで使用される、請求項1から13のいずれか一項に記載の方法。
- 検査ボリューム内に均一な定常磁場を発生させる少なくとも1つの主磁石コイルと、前記検査ボリューム内で異なる空間方向に切り替え磁場勾配を発生させる幾つかの勾配コイルと、前記検査ボリューム内にRFパルスを発生させる及び/又は前記検査ボリューム内に置かれた物体からのMR信号を受け取る少なくとも1つのRFコイルと、RFパルス及び切り替え磁場勾配の時間的連続を制御する制御ユニットと、受け取った前記MR信号からMR画像を再構成する再構成ユニットと、
を含む、MRデバイスであって、前記MRデバイスは、
前記物体を、RF励起パルス及び切り替え磁場勾配を含むイメージングシーケンスに当てることであって、複数のエコー信号が各RF励起パルスの後に異なるエコー時間で生成される、当てることと、
異なるエコー時間が提供され、前記イメージングシーケンスがx/y方向及び/又はz方向における磁場勾配ブリップを含んで、ラジアル又はスパイラルk空間軌跡に沿ってエコー信号データを収集することと、
収集された前記エコー信号データから指定のコントラストのT2 *強調信号を合成することであって、実効エコー時間は、選択されたエコー数、最初のエコー時間及びエコー間隔並びにT2 *によって間接的に決定される、合成することと、
ディクソンアルゴリズムを使用して、水及び脂肪からの前記エコー信号への信号寄与を分離し、B0マップ及び/又は見かけの横緩和時間マップ(T2 *マップ)を推定することと、
合成された前記T2 *強調信号、前記B0マップ及び/前記T2 *マップから、指定のコントラストの画像を再構成することと、
を行う、MRデバイス。 - RF励起パルス及び切り替え磁場勾配を含むイメージングシーケンスを生成する命令であって、複数のエコー信号が各RF励起パルスの後に異なるエコー時間で生成される、生成する命令と、
異なるエコー時間が提供され、前記イメージングシーケンスがx/y方向及び/又はz方向における磁場勾配ブリップを含んで、ラジアル又はスパイラルk空間軌跡に沿ってエコー信号データを収集する命令と、
収集された前記エコー信号データから指定のコントラストのT2 *強調信号を合成する命令であって、実効エコー時間は、選択されたエコー数、最初のエコー時間及びエコー間隔並びにT2 *によって間接的に決定される、合成する命令と、
ディクソンアルゴリズムを使用して、水及び脂肪からの前記エコー信号への信号寄与を分離し、B0マップ及び/又は見かけの横緩和時間マップ(T2 *マップ)を推定する命令と、
合成された前記T2 *強調信号、前記B0マップ及び/前記T2 *マップから、指定のコントラストの画像を再構成する命令と、
を含む、MRデバイスで実行されるコンピュータプログラム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18158035.8 | 2018-02-22 | ||
EP18158035.8A EP3531154A1 (en) | 2018-02-22 | 2018-02-22 | Dixon mr imaging using a multi-gradient-echo sequence |
PCT/EP2019/053754 WO2019162198A1 (en) | 2018-02-22 | 2019-02-15 | Dixon mr imaging using a multi-gradient-echo sequence |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2021514710A true JP2021514710A (ja) | 2021-06-17 |
JPWO2019162198A5 JPWO2019162198A5 (ja) | 2022-02-18 |
Family
ID=61256772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2020544217A Pending JP2021514710A (ja) | 2018-02-22 | 2019-02-15 | マルチグラジエントエコーシーケンスを使用したディクソンmrイメージング |
Country Status (6)
Country | Link |
---|---|
US (1) | US20210096202A1 (ja) |
EP (1) | EP3531154A1 (ja) |
JP (1) | JP2021514710A (ja) |
CN (1) | CN111758041A (ja) |
DE (1) | DE112019000927T8 (ja) |
WO (1) | WO2019162198A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11550013B2 (en) * | 2020-09-30 | 2023-01-10 | GE Precision Healthcare LLC | Systems and methods of silent multi-gradient echo dynamic magnetic resonance imaging |
EP4030178A1 (en) | 2021-01-14 | 2022-07-20 | Koninklijke Philips N.V. | Mr mammography |
WO2022188026A1 (zh) * | 2021-03-09 | 2022-09-15 | 深圳高性能医疗器械国家研究院有限公司 | 一种磁共振多参数定量方法及其应用 |
CN113281690B (zh) * | 2021-05-18 | 2022-08-12 | 上海联影医疗科技股份有限公司 | 一种磁共振成像方法和系统 |
CN114217255B (zh) * | 2021-11-29 | 2022-09-20 | 浙江大学 | 一种快速的肝脏多参数定量成像方法 |
CN117084658A (zh) * | 2022-05-12 | 2023-11-21 | 深圳先进技术研究院 | 磁共振化学交换饱和转移成像方法、系统以及设备 |
EP4336203A1 (en) | 2022-09-09 | 2024-03-13 | Koninklijke Philips N.V. | De-blurring and water/fat separation in mr imaging with spiral acquisition |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0779943A (ja) * | 1993-09-13 | 1995-03-28 | Toshiba Corp | 磁気共鳴映像装置 |
JP2006506154A (ja) * | 2002-11-18 | 2006-02-23 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 磁気共鳴方法及び装置 |
JP2007518485A (ja) * | 2004-01-14 | 2007-07-12 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 正規化可変密度センス |
US20130231554A1 (en) * | 2012-03-05 | 2013-09-05 | Wake Forest University Health Sciences | Vessel encoded arterial spin labeling using fourier encoding suitable for vascular territory mapping |
US20160033607A1 (en) * | 2014-07-31 | 2016-02-04 | Siemens Aktiengesellschaft | Magnetic resonance imaging method and apparatus |
US20160266222A1 (en) * | 2015-03-12 | 2016-09-15 | Mathias Nittka | Magnetic resonance preview image |
US20170322274A1 (en) * | 2016-05-05 | 2017-11-09 | Siemens Healthcare Gmbh | Multi-Echo Pseudo-Golden Angle Stack of Stars Thermometry with High Spatial and Temporal Resolution Using k-Space Weighted Image Contrast |
US20180020946A1 (en) * | 2015-01-30 | 2018-01-25 | Sunnybrook Research Institute | System and method for detection of collagen using magnetic resonance imaging |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2014271235B2 (en) * | 2008-10-01 | 2017-03-02 | Immatics Biotechnologies Gmbh | Novel immunotherapy against several tumors including neuronal and brain tumors |
US7952356B2 (en) * | 2009-06-04 | 2011-05-31 | General Electric Company | System and method for reconstructing multi-spectral 3D MR images |
DE102010041446B4 (de) * | 2010-09-27 | 2013-05-23 | Siemens Aktiengesellschaft | Erstellung eines MR-Bilddatensatzes bei sehr kurzen Echozeiten TE |
EP2500742A1 (en) * | 2011-03-17 | 2012-09-19 | Koninklijke Philips Electronics N.V. | Restriction of the imaging region for MRI in an inhomogeneous magnetic field |
US8502536B2 (en) * | 2011-04-08 | 2013-08-06 | Wisconsin Alumni Research Foundation | Method for accelerated high resolution chemical species separation for magnetic resonance imaging |
DE102011083619B4 (de) * | 2011-09-28 | 2023-01-26 | Siemens Healthcare Gmbh | Verfahren zur Erzeugung einer Serie von MR-Bildern zur Überwachung einer Position eines in einem Untersuchungsgebiet befindlichen Interventionsgeräts, Magnetresonanzanlage und elektronisch lesbarer Datenträger |
US20130076355A1 (en) * | 2011-09-28 | 2013-03-28 | Siemens Corporation | Fast, Low Energy Deposition and Homogeneous T2 Weighted Variable Amplitude PSIF (T2 VAPSIF) Imaging in the Presence of B0inhomogeneities |
US9316711B2 (en) * | 2012-08-07 | 2016-04-19 | Wisconsin Alumni Research Foundation | System and method for accelerated magnetic resonance imaging using spectral sensitivity |
GB2521789B (en) * | 2012-10-02 | 2020-02-26 | Koninklijke Philips Nv | Metal resistant MR imaging reference scan |
WO2015091956A1 (en) * | 2013-12-19 | 2015-06-25 | Koninklijke Philips N.V. | Mri with dixon-type water/fat separation with estimation of the main magnetic field variations |
JP6581584B2 (ja) * | 2013-12-19 | 2019-09-25 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 水/脂肪分離を用いた位相感応型反転回復mri |
US10281547B2 (en) * | 2014-04-21 | 2019-05-07 | Case Western Reserve University | Diffusion-weighted double-echo magnetic resonance fingerprinting (MRF) |
WO2015164109A1 (en) * | 2014-04-24 | 2015-10-29 | Dignity Health | System and method for spiral multislab magnetic resonance imaging |
WO2016180983A1 (en) * | 2015-05-13 | 2016-11-17 | Koninklijke Philips N.V. | Multi-echo mri with correction of concomitant gradient-induced phase errors |
CN107219484B (zh) * | 2016-03-22 | 2023-09-22 | 西门子(深圳)磁共振有限公司 | 多层并行激发弥散成像的激发翻转角度确定方法和装置 |
CN109219757B (zh) * | 2016-06-02 | 2021-10-12 | 皇家飞利浦有限公司 | Dixon型水/脂肪分离MR成像 |
-
2018
- 2018-02-22 EP EP18158035.8A patent/EP3531154A1/en not_active Withdrawn
-
2019
- 2019-02-15 JP JP2020544217A patent/JP2021514710A/ja active Pending
- 2019-02-15 DE DE112019000927.3T patent/DE112019000927T8/de not_active Expired - Fee Related
- 2019-02-15 CN CN201980014803.3A patent/CN111758041A/zh active Pending
- 2019-02-15 WO PCT/EP2019/053754 patent/WO2019162198A1/en active Application Filing
- 2019-02-15 US US16/971,031 patent/US20210096202A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0779943A (ja) * | 1993-09-13 | 1995-03-28 | Toshiba Corp | 磁気共鳴映像装置 |
JP2006506154A (ja) * | 2002-11-18 | 2006-02-23 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 磁気共鳴方法及び装置 |
JP2007518485A (ja) * | 2004-01-14 | 2007-07-12 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 正規化可変密度センス |
US20130231554A1 (en) * | 2012-03-05 | 2013-09-05 | Wake Forest University Health Sciences | Vessel encoded arterial spin labeling using fourier encoding suitable for vascular territory mapping |
US20160033607A1 (en) * | 2014-07-31 | 2016-02-04 | Siemens Aktiengesellschaft | Magnetic resonance imaging method and apparatus |
US20180020946A1 (en) * | 2015-01-30 | 2018-01-25 | Sunnybrook Research Institute | System and method for detection of collagen using magnetic resonance imaging |
US20160266222A1 (en) * | 2015-03-12 | 2016-09-15 | Mathias Nittka | Magnetic resonance preview image |
US20170322274A1 (en) * | 2016-05-05 | 2017-11-09 | Siemens Healthcare Gmbh | Multi-Echo Pseudo-Golden Angle Stack of Stars Thermometry with High Spatial and Temporal Resolution Using k-Space Weighted Image Contrast |
Also Published As
Publication number | Publication date |
---|---|
DE112019000927T5 (de) | 2020-11-26 |
DE112019000927T8 (de) | 2020-12-10 |
CN111758041A (zh) | 2020-10-09 |
EP3531154A1 (en) | 2019-08-28 |
US20210096202A1 (en) | 2021-04-01 |
WO2019162198A1 (en) | 2019-08-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2021514710A (ja) | マルチグラジエントエコーシーケンスを使用したディクソンmrイメージング | |
JP6469703B2 (ja) | Dixon式水/脂肪分離を用いたMRイメージング | |
JP7075420B2 (ja) | 可変コントラストのスタック・オブ・スター収集を使用したmrイメージング | |
JP6255005B2 (ja) | Aptコントラスト向上および複数エコー時間におけるサンプリングを用いたmr撮像 | |
JP6204924B2 (ja) | Dixon型水/脂肪分離と主磁場不均一性に関する予備知識とを用いるMRI | |
JP6581584B2 (ja) | 水/脂肪分離を用いた位相感応型反転回復mri | |
JP6912603B2 (ja) | デュアルエコーディクソン型水/脂肪分離mr撮像 | |
JP2019522513A (ja) | ディクソン法による水/脂肪分離を用いたmr撮像 | |
JP7446328B2 (ja) | ソフト動きゲーティングによる3dラジアル又はスパイラル収集を用いたmr画像 | |
US10859652B2 (en) | MR imaging with dixon-type water/fat separation | |
JP7023954B2 (ja) | プロペラmrイメージング | |
JP2020522344A (ja) | 並列マルチスライスmr撮像 | |
JP2021505296A (ja) | 脂肪抑制を用いる拡散mrイメージング | |
EP3931588A1 (en) | Epi mr imaging with distortion correction | |
US20240069136A1 (en) | Mr mammography | |
JP2022521277A (ja) | ウェーブ符号化を用いたパラレルmrイメージング |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20220209 |
|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20220209 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20221216 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20230106 |
|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20230725 |