File:3D-PET-SUV.3-dimensional 18FFDG-PET image with 3D ROI generated by a threshold based algorithm. The blue dot in the MIP image bottom right marks the maximum<unk>  within the ROI. The<unk>  <unk>  is a nuclear medicine term, used in positron emission tomography (PET) as well as in modern calibrated single photon emission tomography (SPECT) imaging for a semiquantitative analysis.18Ffluorodeoxyglucose () images of cancer patients. It can also be used with other PET agents especially when no arterial input function is available for more detailed pharmacokinetic modeling. Otherwise measures like the fractional<unk>  rate (FUR) or parameters from more advanced pharmacokinetic modeling may be preferable. The<unk>  is the ratio of the image-derived radioactivity concentration cimg and the whole body concentration of the injected radioactivity cinj,
Standardized uptake value
Peak-to-trough ratio
Oxygen enhancement ratio
Extraction ratio
Renal clearance ratio
Cancer slope factor
NC ratio
Dose area product