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Calgary Health Region - Diagnostic Imaging


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CT (Computed Tomography)
   
  
What is CT (Computed Tomography)?

CT (computed tomography), sometimes called CAT scan, uses special x-ray equipment to obtain image data from different angles around the body, and then uses computer processing of the information to show a cross-section of body tissues and organs. 

CT imaging is particularly useful because it can show several types of tissue -- lung, bone, soft tissue, and blood vessels -- with great clarity. Using specialized equipment and expertise to create and interpret CT scans of the body, radiologists can more easily diagnose problems such as cancers, cardiovascular disease, infectious disease, trauma, and musculoskeletal disorders. CT of the body is a patient-friendly exam that involves little radiation exposure.


How is the Procedure Performed? 

The patient will be asked to lie on a narrow table (gantry) that slides into the center of the scanner. Depending on the study being performed, the patient may need to lie on his/her stomach, back, or side. If contrast media (dye) is to be administered, an IV will be placed in a small vein of a hand or arm.

Much like standard photographic cameras, subject motion causes blurred images in CT. Therefore, the technologist operating the scanner and supervising the patient will give instructions through an intercom when to hold one's breath and not move.

As the exam takes place, the gantry will advance small intervals through the scanner. Modern "spiral" scanners can perform the examination in one continuous motion of the gantry. Generally, complete scans will only take a few minutes, however, additional contrast-enhanced or higher-resolution scans will add to the scan time.

Where is CT Performed?

The Calgary Health Region DI Department operates 10 CT machines: 3 at the Foothills Medical Centre, 2 at the Rockyview Hospital and 2 at the  Peter Lougheed Centre, as well as 1 each at the the Alberta Children's Hospital the High River General Hospital, and the Canmore General Hospital.

Revised: May 24 07

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