Definition

A radioactive substance being studied in positron emission tomography (PET) imaging to find certain types of cancer. 18F-choline gets taken up by cells in the body and more of it is taken up by cancer cells than by normal cells. A PET scanner is used to find which cells in the body have taken up 18F-choline. Also called 18F-fluoromethylcholine, 18F-FMCH, and fluorine F 18-fluoromethylcholine.