A CT (computed tomography) scan is a type of imaging test. Like an X-ray, it shows structures inside your body. But instead of creating a flat, 2D image, a CT scan takes dozens to hundreds of images of your body. To get these images, a CT machine takes X-ray pictures as it revolves around you.

Common Questions

What does a CT scan show?

A CT scan takes pictures of your:

• Bones
• Muscles
• Organs
• Blood Vessels

What can CT scans detect?

CT scans help healthcare providers detect various injuries and diseases, including:

• Certain types of cancer and benign (noncancerous) tumors.
• Fractures (broken bones).
• Heart disease.
• Brain injuries.
• Spinal cord injuries.
• Internal bleeding.

What should I expect during my CT scan?

During the test, you’ll usually lie on your back on a table (like a bed). If your test requires it, a healthcare provider may inject the contrast dye intravenously (into your vein). This dye can make you feel flushed or give you a metallic taste in your mouth.
When the scan begins:

• The bed slowly moves into the doughnut-shaped scanner. At this point, you’ll need to stay as still as possible because movement can blur the images.
• You may also be asked to hold your breath for a short period of time, usually fewer than 15 to 20 seconds.
• The scanner takes pictures of the area your healthcare provider needs to see. Unlike an MRI scan (magnetic resonance imaging scan), a CT scan is silent.
• When the exam is over, the table moves back out of the scanner.

How long does a CT scan take?

CT scans usually take about an hour. Most of that time is for the preparation. The scan itself takes fewer than 10 or 15 minutes. You can resume normal activities after your provider gives you the OK — usually after they complete the scan and make sure the images are of good quality.