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fx-fy plane and fy-fz plane of the 3D NPS and radial NPS from water phantom. Estimated NPS (first column), analytical NPS (second column), and radial NPS (third column) for (a) an isocentered volume and (b) a volume at (0, 0, 13 cm). The display range in both cases is [0 to 3×10−8].
