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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