spiral CAT scan

spiral CAT scan A specialized computerized axial tomography (CAT) scan technique that involves continuous movement of the patient through the scanner with the ability to scan faster and with high definition of internal structures. Spiral CAT scanning permits greater visualization of blood vessels and internal tissues, such as those within the chest cavity, than regular CAT scanning. This form of scanning is particularly helpful in the rapid evaluation of severe trauma injuries, such as those sustained in automobile accidents. Also known as helical CAT scan. See also CAT scan.