Radiologic Tests for Prostate Cancer CT Scan (“CAT SCAN”) A CT scan is an XRray test that obtains thin slices throughout the body, using radiation and intravenous contrast. These are used in turn to determine if there has been any metastasis to other organs or lymph nodes or if there is extension of prostate cancer beyond the capsule. Magnetic Resonance Imaging (MRI) An MRI is film obtained by magnetic field without the need for radiation. An MRI is a useful test for examining soft tissue and bones. This can help determine lymph node or bone involvement. By placing an endo-rectal coil within the rectum, one can help determine the extension of the cancer beyond the capsule of the prostate. Bone Scan A bone scan is an X-Ray test using a radionuclide for bones which determines if the cancer has metastasized to the bones. Prostascint Scan A prostascint scan is an X-Ray test with radionuclide that attaches to tissues that make PSA. Theoretically, if there is PSA production in an area outside the prostate gland other than blood vessels, then that area probably contains prostate cancer, indicating prostate cancer spread. Prostascint scans, however, are not always accurate, and have a high rate of false-positive results. Prostate Doppler A prostate Doppler exam is a trans-rectal ultrasound test of the prostate which uses sound waves to determine degree of blood flow in various regions of the prostate. The theory is that areas with higher blood flow contain cancerous lesions, an association which has not yet been proven. Research on this topic has not yet proven that an ultrasound Doppler of the prostate can accurately find areas of cancer in the prostate.