CAT scan uses computer enhanced X-rays to create a cross-sectional image of the anatomy. There are several different scans: the brain scan, abdomen scan, and chest scan. Patient preparation varies depending upon which scan is being made. During the actual scan, patients lie still and may be asked to hold their breath from time to time.
CT Brain Scan
For a scan such as this, patients may be given an I.V. injection of "contrast media," a solution that can be seen by the scanner. This scan takes a total of about 15 minutes.
CT Abdomen Scan
Before this scan, patients are given contrast media to drink, (an hour after finishing the drink) and then may have an I.V. injection of more contrast media. This test takes from 20 to 25 minutes to complete.
CT Chest Scan
Patients in a CT Chest Scan are given an I.V. injection of contrast media before the scan, which takes 5 to 15 minutes.
For more information of CT Scans, please visit this site.