A CAT scan, also referred to as a CT (computerized tomography) scan, is a three-dimensional X-ray that shows computerized images of internal organs, soft tissue, blood vessels and bones. CT scans show more details than a standard X-ray.
Traditional CT scanner
Features
A typical CT scanner has a narrow exam table on which the patient lies and is slid in and out of the CT tunnel. It is non-invasive. The tunnel will rotate around the patient while taking multiple images.
Function
During the CT scan, X-ray beams and electronic X-ray detectors move around the patient and measure radiation that is absorbed during the scan. The beam goes in a spiral direction.
Significance
As the X-rays are taken, a computer forms cross-sectional images that are two-dimensional. These are the images the physician will view.
Types
A standard CT scan only involves the patient lying still and being scanned. A contrast CT consists of either a contrast inserted through an IV or an oral contrast swallowed before the scan.
Considerations
Most CT scans are done quickly. The patient must remain very still. Claustrophobic patients or those in chronic pain who find it hard to stay still may be offered a sedative before the procedure.
Tags: around patient
