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Fig. 2B —Diffusion-weighted images of bottle phantom. Acetone phantom was located at periphery of image (D in Fig. 1) and scanned without parallel imaging (A) and with parallel imaging factors of 1 (B), 2 (C), 3 (D), and 4 (E). Although phantom is clearly visualized on every image, image distortion is severe on images without parallel imaging and with parallel imaging factor of 1. Parallel imaging improved image quality of diffusion-weighted images. Distortion scores were assigned as 1 for images A and B and assigned as 2 for images C, D, and E.