Diffusion weighted EPI is susceptible to distortions due to multiple causes, and the amount of distortion is dependent on many interacting factors. Hence no good methodology currently exists for assessing and characterizing these distortions. In this work an EPI sequence is modified to include Spatial Modulation of Magnetization (SPAMM), a preparation technique that produces tagged grid lines in the imaged volume. This sequence is acquired to measure induced distortion in several phantoms in different coils with different sequence options, measuring distortion as it varies with parallel imaging acceleration, diffusion weighting direction, and susceptibility of various phantom materials.
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