X-rays and CT scans are performed when a doctor considers diagnostic imaging appropriate for evaluating symptoms, injuries, suspected conditions, or monitoring certain medical conditions. The recommended imaging test depends on the clinical situation.

An X-ray produces a two-dimensional image and is commonly used to examine bones, the chest, and other areas. A CT scan uses multiple X-ray images processed by a computer to create more detailed cross-sectional images of the body.

Preparation depends on the type of CT scan. Some examinations may require fasting, specific instructions regarding food or fluids, or contrast preparation. The radiology team will provide the necessary instructions before your examination.

A CT scan is generally a non-invasive and painless imaging procedure. You may need to lie still on the scanning table during the examination. If contrast material is required, you may experience a brief sensation such as warmth or a temporary metallic taste.