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A modified Shepp-Logan phantom (left) with a display window [0, 1] and a magnified ROI (right) with a display window [0, 0.5]. In the right image, the large circle indicates the ROI whose diameter is 10.0 mm, the medium circle indicates a sub-region where the RMSEs will be measured and the small circle indicates the sub-region where the standard deviations will be measured.
