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Interleaved EPI diffusion imaging using SPIR i T ‐based reconstruction with virtual coil compression
Author(s) -
Dong Zijing,
Wang Fuyixue,
Ma Xiaodong,
Zhang Zhe,
Dai Erpeng,
Yuan Chun,
Guo Hua
Publication year - 2018
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.26768
Subject(s) - electromagnetic coil , computer science , acceleration , compression (physics) , iterative reconstruction , magnetic resonance imaging , computation , artificial intelligence , compressed sensing , computer vision , acoustics , algorithm , materials science , physics , radiology , medicine , classical mechanics , quantum mechanics , composite material
Purpose To develop a novel diffusion imaging reconstruction framework based on iterative self‐consistent parallel imaging reconstruction (SPIRiT) for multishot interleaved echo planar imaging (iEPI), with computation acceleration by virtual coil compression. Methods As a general approach for autocalibrating parallel imaging, SPIRiT improves the performance of traditional generalized autocalibrating partially parallel acquisitions (GRAPPA) methods in that the formulation with self‐consistency is better conditioned, suggesting SPIRiT to be a better candidate in k‐space–based reconstruction. In this study, a general SPIRiT framework is adopted to incorporate both coil sensitivity and phase variation information as virtual coils and then is applied to 2D navigated iEPI diffusion imaging. To reduce the reconstruction time when using a large number of coils and shots, a novel shot‐coil compression method is proposed for computation acceleration in Cartesian sampling. Simulations and in vivo experiments were conducted to evaluate the performance of the proposed method. Results Compared with the conventional coil compression, the shot‐coil compression achieved higher compression rates with reduced errors. The simulation and in vivo experiments demonstrate that the SPIRiT‐based reconstruction outperformed the existing method, realigned GRAPPA, and provided superior images with reduced artifacts. Conclusion The SPIRiT‐based reconstruction with virtual coil compression is a reliable method for high‐resolution iEPI diffusion imaging. Magn Reson Med 79:1525–1531, 2018. © 2017 International Society for Magnetic Resonance in Medicine.