Three-Dimensional Magnetization-Prepared Imaging Using a Concentric Cylinders Trajectory
- 주제(키워드) non-Cartesian trajectories , 3D concentric cylinders , magnetization-prepared imaging
- 주제(기타) Radiology, Nuclear Medicine & Medical Imaging
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 WILEY-BLACKWELL
- 발행년도 2014
- URI http://www.dcollection.net/handler/ewha/000000161823
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/mrm.24823
초록/요약
PurposeTo develop new magnetization-prepared imaging schemes based on a three-dimensional (3D) concentric cylinders trajectory. MethodsThe 3D concentric cylinders trajectory, which is robust to off-resonance effects and timing delays while requiring fewer excitations than a comparable 3D Cartesian (3DFT) sequence, is used as the readout for magnetization-prepared sequences exploiting its inherently centric-ordered structure. Two applications: (i) T-1-weighted brain imaging with an inversion-recovery-prepared radiofrequency-spoiled gradient-echo (IR-SPGR) sequence, (ii) non-contrast-enhanced (NCE) peripheral angiography with a magnetization-prepared balanced steady-state free precession (bSSFP) sequence are presented to demonstrate the effectiveness of the proposed method. For peripheral angiography, the scan efficiency is further improved by interleaving different preparations at different rates and by carefully designing the sampling geometry for an efficient parallel imaging method. ResultsIn vivo brain scans with an IR-SPGR sequence and lower extremity scans with a magnetization-prepared bSSFP sequence for NCE peripheral angiography both demonstrate that the proposed sequences with concentric cylinders effectively capture the transient magnetization-prepared contrast with faster scan times than a corresponding 3DFT sequence. The application of peripheral angiography also shows the feasibility of the proposed interleaving schemes and parallel imaging method. ConclusionThe 3D concentric cylinders trajectory is a robust and efficient readout that is well-suited for magnetization-prepared imaging. Magn Reson Med 71:1700-1710, 2014. (c) 2013 Wiley Periodicals, Inc.
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