Accelerated Propeller FSE-DWI with Locally Low Rank Regularized Reconstruction
Uten Yarach1, Suwit Saekho1, Kittichai Wantanajittikul1, Salita Angkurawaranon2, Chakri Madla2, Charuk Hanprasertpong3, and Prapatsorn Sangpin4
1Department of Radiologic Technology, Faculty of Associated Medical Science, Chiang Mai University, Chiang Mai, Thailand, 2Department of Radiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand, 3Department of Otolaryngology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand, 4Philips (Thailand) Ltd., Bangkok, Thailand
Propeller FSE-DWI has been a method of choice in particular for Cholesteatoma. However, its natures such as prolong scan time, low signal-to-noise ratio (SNR), and phase variations among the blades have been challenging. Parallel imaging technique can be applied to reduce scan time, but phase estimation/correction is often compromised due to g-factor noise penalty. In this work, we develop an iterative reconstruction with locally low rank (LLR) regularization to maximize quality of propeller FSE-DWI images. As a result, LLR enable improving SNR up to SENSE factor of 4 compared to images obtained by vendor’s provided reconstruction engine.
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