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fx-fy plane and fy-fz plane of the 3D NPS and radial NPS for an entire volume. Estimated NPS (first column), analytical NPS (second column), and radial NPS (third column) for (a) air and (b) water phantom. The display window level of NPS images of air and water are [0 to 5.8×10−10] and [0 to 1.9×10−8].
