The computerized tomography (CT) scan, also know as the computerized axial tomography (CAT) scan, is another test that your doctor may recommend. Often, it is used to check whether enlarged lymph nodes are visible. Remember that prostate cancer can spread through the lymphatic system. Unfortunately, lymph node enlargement around the pelvis is relatively difficult for the CT scan to read, and the pelvic area is a primary site of prostate cancer spread.

A CT scan creates images using a computer and an X-ray sensing unit that encircles the body. Because different tissues absorb different amounts of these X-rays, detectors can measure the radiation leaving the body and convert this information into fairly precise images. These look like cross-sections or visual slices of the body.

CT Scan of a Man's Pelvic Area

If you have a CT scan, you will be asked to lie flat on a table inside a doughnut-shaped machine. An X-ray tube inside this machine will rotate around you passing small amounts of radiation through your body at various angles. An array of detectors will collect information regarding these X-rays and convert that information into data from which computers can create pictures. The whole process usually takes about an hour.