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Three‐dimensional magnetization‐prepared imaging using a concentric cylinders trajectory
Author(s) -
Kwon Kie Tae,
Wu Holden H.,
Shin Taehoon,
Çukur Tolga,
Lustig Michael,
Nishimura Dwight G.
Publication year - 2014
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24823
Subject(s) - magnetization , concentric , interleaving , materials science , nuclear magnetic resonance , gadolinium , sequence (biology) , physics , trajectory , computer science , biomedical engineering , mathematics , geometry , chemistry , medicine , biochemistry , magnetic field , metallurgy , operating system , quantum mechanics , astronomy
Purpose To develop new magnetization‐prepared imaging schemes based on a three‐dimensional (3D) concentric cylinders trajectory. Methods The 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. Results In 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. Conclusion The 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. © 2013 Wiley Periodicals, Inc.