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Geometric distortions inherent in echo-planar imaging (EPI), evident from the comparison between a fast spin-echo (FSE) T2-weighted image (left) and the b = 0 image of a pulsed gradient SE-EPI experiment, after rigid (middle) and nonlinear transformation (right)60 to match the anatomy of the FSE T2-weighted image. The cranial contents are outlined in red on the FSE image, and the same outline is superimposed on the other images to show the degree of distortion.
