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Method to measure CT noise power spectrum using Ge-68 solid epoxy phantom: (1) gather 4D independent images, (2) apply gain & offset correction and subtract mean, (3a) take 2D Fourier Transform of each image, (3b) take magnitude of results & square it, (3c) calculate Average of 40 results, (4) calculate 1D NPS by radial average of the 2D result.
