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Images from Subject 004. CT (a) and PET (b) images corresponding to central mid-thigh cross section of thigh volume. The fused PET/CT image is shown in (c). The tissue activity curve (TAC) was computed from the region encompassing the total thigh muscle volume, but excluding bone and the region used to determine the image-derived input function (IDIF). These regions are superimposed in gold pixels on all three images
