CT/CTA

Computerized tomography -- also called CT, CT scan or CAT scan -- is an X-ray that produces more detailed images of your internal organs than regular X-rays, which produce two-dimensional images. CTs use an X-ray-sensing unit that rotates around the patient's body to create cross-sectional images (like slices) of the inside of your body.

For example, a conventional X-ray of your abdomen shows your bones, as well as subtle outlines of the liver, stomach, intestines, kidney and spleen. In addition, however, a CT scan reveals the pancreas, adrenal glands, uterus and blood vessels -- all with a higher degree of precision. CT is a noninvasive way to view your internal organs and tissues.

Unlike MRI, CT exams can be performed on patients with a pacemaker or cardioverter defibrillator. If a woman is pregnant or suspects she might be, her doctor may suggest postponing the procedure or choose an alternative exam that doesn't involve radiation, such as ultrasound or MRI.