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Abstract #1328

Four-shot Navigator-free Spiral Acquisition Strategy for High-resolution Diffusion Imaging

Guangqi Li1, Xinyu Ye1, Xin Shao1, Xiaodong Ma2, and Hua Guo1
1Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, 2Center for Magnetic Resonance Research, Radiology, Medical School, University of Minnesota, Minneapolis, MN, United States

Multi-shot acquisition is widely used for high-resolution diffusion weighted imaging (DWI). For multi-shot spiral DWI, one of the challenges is correcting shot-to-shot phase variations. Uniform density spiral (UDS) is a navigator-free acquisition scheme with high efficiency of spatial encoding. Previous studies indicated that POCS-ICE algorithm can iteratively solve the phase errors for navigator-free acquisitions in multi-shot diffusion imaging. Another challenge is off-resonance correction. In this study, we proposed two acquisition strategies to reduce spiral readout duration for alleviating blurring effects. High-resolution diffusion-weighted images can be acquired using a 4-shot navigator-free spiral acquisition.

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