Practical parallel imaging compressed sensing MRI: Summary of two years of experience in accelerating body MRI of pediatric patients

• Published in: 2011 IEEE International Symposium on Biomedical Imaging: From Nano to Macro Vol. 2011; pp. 1039 - 1043
• Main Authors: Vasanawala, S S, Murphy, M J, Alley, M T, Lai, P, Keutzer, K, Pauly, J M, Lustig, M
• Format: Conference Proceeding Journal Article
• Language: English
• Published: United States IEEE 31.12.2011
• Subjects: Acceleration; Coils; Compressed sensing; Image reconstruction; Magnetic resonance imaging; Parallel Imaging; Pediatric MRI; SPIRiT; Three dimensional displays; Pediatric MRI; Parallel Imaging; SPIRiT; Compressed Sensing
• ISBN: 1424441277; 9781424441273
• ISSN: 1945-7928; 1945-8452
• DOI: 10.1109/ISBI.2011.5872579

For the last two years, we have been experimenting with applying compressed sensing parallel imaging for body imaging of pediatric patients. It is a joint-effort by teams from UC Berkeley, Stanford University and GE Healthcare. This paper aims to summarize our experience so far. We describe our acquisition approach: 3D spoiled-gradient-echo with poisson-disc random undersampling of the phase encodes. Our reconstruction approach: ℓ 1 -SPIRiT, an iterative autocalibrating parallel imaging reconstruction that enforces both data consistency and joint-sparsity in the wavelet domain. Our implementation: an on-line parallelized implementation of ℓ 1 -SPIRiT on multi-core CPU and General Purpose Graphics Processors (GPGPU) that achieves sub-minute 3D reconstructions with 8-channels. Clinical results showing higher quality reconstruction and better diagnostic confidence than parallel imaging alone at accelerations on the order of number of coils.