Also known as Computed Tomography, a CT scan produces detailed images of sections of the body, much like slicing a loaf of bread. It uses special X-ray equipment and computers to take pictures of internal organs, bones, soft tissue, and blood vessels. CT scans provide greater clarity and reveal more details than regular X-rays or radiograph exams.
This section is meant to address a number of frequently asked questions about Computed tomography.
A CT scanner is typically a large, round, or box-like machine with a hole or short tunnel in the center. Often, it’s shaped like a large doughnut. When you go for a scan, you lie on a narrow examination table that slides into and out of the tunnel. Inside the machine, an X-ray tube and electronic detectors are positioned opposite each other in a ring called a gantry, which rotates around you during the scan.
During a CT scan, the X-ray source and a series of detectors (which record the images) are contained in a doughnut-shaped machine. You’ll lie on a motorized table that slowly moves you through the machine. In some cases, an iodinated contrast agent may be injected into your vein to enhance the images. Certain procedures, such as biopsies, joint, or nerve injections, might require local anesthesia and precise needle placement.
A CT scan is usually ordered by a referring doctor. The scan is performed by a trained radiographer, who operates the CT scanner and ensures that the process follows the doctor’s prescription. A radiologist, a specialized professional, is responsible for reviewing the images, interpreting them, and creating a report that is sent back to your doctor for further discussion.
Your doctor may recommend a CT scan because of its ability to provide specific information that helps in diagnosis, treatment planning, or monitoring. However, other imaging methods, such as MRI, ultrasound, or X-ray, might also be used depending on the case or in addition to the CT scan.
Follow the instructions provided on your referral form or by your doctor. If your CT scan involves the injection of a contrast agent, it’s recommended that you avoid eating or drinking for at least 4 hours before the procedure. If you have any allergies—particularly to contrast materials, medications, latex, or local anesthesia—be sure to mention them on the form or inform the radiographer before the scan.
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