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Abstract #2449

L1-ESPIRiT Reconstruction for Accelerating 3D UTE and Denoising

Wenwen Jiang 1 , Frank Ong 2 , Roland Henry 3 , Michael Lustig 2 , and Peder E.Z. Larson 3

1 Bioengineering, UC Berkeley/UCSF, Berkeley, CA - California, United States, 2 EECS, UC Berkeley, Berkeley, California, United States, 3 Radiology and Biomedical Imaging, UCSF, San Francisco, CA - California, United States

Ultrashort echo time (UTE) imaging has shown promise for imaging tissues with ultrashort T2 values. UTE with a 3D radial trajectory requires π times the number of phase-encodings as the Cartesian counterpart, requiring long scan times. Practically, ~π times undersampling can be used for acceleration without noticeable streak aliasing artifacts with gridding reconstruction. However, the undersampling-induced aliasing results in noise-like artifacts. We propose using L1-ESPIRiT on 3D UTE for effectively removing streak and noise-like undersampling artifacts, and allowing for high acceleration factors with robustness. The in vivo applications for brain imaging shows the benefits of L1-ESPIRiT for 3D UTE.

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