Improve Image Homogeneity of High-Resolution DWI

EPI based diffusion imaging is widely used yet suffers from geometric distortions, which become more pronounced in high resolution imaging. This work presents a method to implement 2D excitation for high-resolution EP-DWI with reduced phase encoding FOV, and thus to reduce the geometric distortion. Comparing to prior-art technique, the 2D excitation in this work is equipped with a pair of walking-saturations, which can improve the excitation profile in the phase encoding FOV direction and get more homogeneous imaging results. The proposed method is also shown to increase the max number of slices per TR comparing to traditional 2D excitation.

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