COMPUTERIZED tomographic (CT) scanning has been established as a valuable diagnostic examination for intracranial disease.1-6 The EMI scanner developed by Godfrey Hounsfield in England has been in clinical operation in the United States since 1973. The ACTA scanner, developed at Georgetown University Medical Center by Robert S. Ledley, DDS, has been operational since February 1974. It was the first CT equipment applicable to other parts of the body, as well as the brain. A modification of the computer program and the scanner mechanism permitted scanning to be performed without a water bath or other absorption-equilibrating medium around the body part being examined. The ability of the new Georgetown unit to apply this radiographic technique to the entire body has opened many new areas for clinical investigation and application. This report on our first year of experience with the ACTA scanner emphasizes the extracerebral (pertaining to all parts of the