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A 3D k‐space Fourier encoding and reconstruction framework for simultaneous multi‐slab acquisition
Author(s) -
Dai Erpeng,
Wu Yuhsuan,
Wu Wenchuan,
Guo Rui,
Liu Simin,
Miller Karla L.,
Zhang Zhe,
Guo Hua
Publication year - 2019
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.27793
Subject(s) - k space , slab , encoding (memory) , aliasing , fourier transform , acceleration , computer science , isotropy , physics , diffusion mri , sampling (signal processing) , compressed sensing , resolution (logic) , algorithm , optics , computer vision , artificial intelligence , undersampling , magnetic resonance imaging , classical mechanics , quantum mechanics , geophysics , medicine , filter (signal processing) , radiology
Purpose To propose a novel 3D k‐space Fourier encoding and reconstruction framework for simultaneous multi‐slab (SMSlab) acquisition and demonstrate its efficacy in high‐resolution imaging. Methods First, it is illustrated in theory how the inter‐slab gap interferes with the formation of the SMSlab 3D k‐space. Then, joint RF and gradient encoding are applied to remove the inter‐slab gap interference and form a SMSlab 3D k‐space. In vivo experiments are performed to validate the proposed theory. Acceleration in the proposed SMSlab 3D k‐space is also evaluated. Results High‐resolution (1.0 mm isotropic) images can be reconstructed using the proposed SMSlab 3D framework. Controlled aliasing in parallel imaging sampling and 2D GRAPPA reconstruction can also be applied in the SMSlab 3D k‐space. Compared with conventional multi‐slab acquisition, SMSlab exhibits better SNR maintainability (such as lower g‐factors), especially at high acceleration factors. Conclusion It is demonstrated that the joint application of RF and gradient encoding enables SMSlab within a 3D Fourier encoding framework. Images with high isotropic resolution can be reconstructed, and further acceleration is also applicable. The proposed SMSlab 3D k‐space can be valuable for both high‐resolution and high‐efficiency diffusion and functional MRI.