Fig. 2From: Localization of TSH-secreting pituitary adenoma using 11C-methionine image subtractionNormalization of PET images. ROI drawn around the reference region (cerebellum shown here) on one slice of the PET image. The PET images are divided by the mean signal from the reference ROI to create a ratio image known as standardized uptake value ratios (SUVrs)Back to article page