PET Scan


A positron emission tomography, or PET, is a study generally used to assist in staging of colorectal cancers.  A radioactively labeled sugar molecule called FDG is used as a tracer to detect cells with an increased level of metabolic activity.  These cells will take up a disproportionate amount of the tracer, causing them to “light-up” on the 3-D image of the body.  This technique is often combined with a CT scan image done on the same day to improve diagnostic accuracy.