Table 1 Biological and technical factors affecting PET images

Any process associated with increased glycolysis

Scan acquisition parameters

• scan duration

•Brown Fat

• bed overlap

•Inflammatory cause

• FDG dose

•Hyperplasia in the bone marrow post granulocyte colony-stimulating factor

Image reconstruction and spatial resolution of scanner

•Patients motion/breathing

Timing of PET scan after FDG administration

•Patient comfort

ROI strategy and normalization calculation

•Blood glucose level

Use of contrast agents during CT