Physiology of lesion
Pet scans most often use a radioactive
form of glucose
, the energy source for most of the cells in our bodies.
The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region. The areas using more glucose are hyper metabolic and generally more worrisome. Our brains and sometimes hearts prefer glucose as food, making it hard to see.