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Accelerating non‐contrast‐enhanced MR angiography with inflow inversion recovery imaging by skipped phase encoding and edge deghosting (SPEED)
Author(s) -
Chang Zheng,
Xiang QingSan,
Shen Hao,
Yin FangFang
Publication year - 2010
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.22069
Subject(s) - undersampling , steady state free precession imaging , inflow , computer science , image quality , iterative reconstruction , real time mri , artificial intelligence , magnetic resonance imaging , physics , medicine , radiology , image (mathematics) , mechanics
Purpose: To accelerate non‐contrast‐enhanced MR angiography (MRA) with inflow inversion recovery (IFIR) with a fast imaging method, Skipped Phase Encoding and Edge Deghosting (SPEED). Materials and Methods: IFIR imaging uses a preparatory inversion pulse to reduce signals from static tissue, while leaving inflow arterial blood unaffected, resulting in sparse arterial vasculature on modest tissue background. By taking advantage of vascular sparsity, SPEED can be simplified with a single‐layer model to achieve higher efficiency in both scan time reduction and image reconstruction. SPEED can also make use of information available in multiple coils for further acceleration. The techniques are demonstrated with a three‐dimensional renal non‐contrast‐enhanced IFIR MRA study. Results: Images are reconstructed by SPEED based on a single‐layer model to achieve an undersampling factor of up to 2.5 using one skipped phase encoding direction. By making use of information available in multiple coils, SPEED can achieve an undersampling factor of up to 8.3 with four receiver coils. The reconstructed images generally have comparable quality as that of the reference images reconstructed from full k ‐space data. Conclusion: As demonstrated with a three‐dimensional renal IFIR scan, SPEED based on a single‐layer model is able to reduce scan time further and achieve higher computational efficiency than the original SPEED. J. Magn. Reson. Imaging 2010;31:757–765. © 2010 Wiley‐Liss, Inc.