isDiagnosisFor epilepsy imaging technique positron emission tomography true true true PERSON: Nicole Vasilevsky PET An imaging technique that produces a three-dimensional image or picture of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule. Three-dimensional images of tracer concentration within the body are then constructed by computer analysis. https://www.ncbi.nlm.nih.gov/pubmed/14537108 http://en.wikipedia.org/wiki/Positron_emission_tomography