| The individual being scanned must lie still on a padded metal couch that is encircled by the CT scanner. The individual is positioned in the scanner so that the correct part of the body is located in the center of the scanner. Scans are painless, and most take between 10 to 30 minutes. If an intravenous contrast medium is required, a temporary catheter or needle is placed into a vein for injection of that medium. There is usually no need for specific pre-procedure preparation, although some abdominal scans may require that the individual fast for a short period of time. Scans that focus on the bladder require the bladder to be full prior to scanning. |
Source: Medical Disability Advisor