Your brain on depression~ PET scan shows hot spots of increased activity in the brain of a non-depressed person. (Depression is not a sign of weakness or negative personality. It is a major health problem and a treatable medical condition)
Embroidery of non traditional subject matter PET scan of brain: science cross-stitch by nerdylittlestitcher
What is a PET scan, how is it done, and how does it help diagnose (or rule out) the spread of cancer?
Gilbert and George coloured pet scans.
Bita Badakhshan describes two inexpensive cancer tests that work better for detecting cancer than the usual PET scan.