A computed tomography (CT) scan is a fast, painless, noninvasive diagnostic tool using a special type of X-ray to produce detailed pictures of structures inside of the body. A CT scan is also called a computerized axial tomography (CAT) scan.
A CT scanner directs a series of X-rays through the body that are analyzed by a computer to produce a detailed picture of a "slice" of an organ or area being studied. Each X-ray pulse lasts only a fraction of a second, and it takes only a few seconds for the machine to record each slice.
CT Imaging...
...is one of the best and fastest tools for studying the chest, abdomen and pelvis because it provides detailed, cross-sectional views of all types of tissue.
...is often the preferred method for diagnosing many different cancers, including lung, liver and pancreatic cancer, since the image allows a physician to confirm the presence of a tumor and measure its size, precise location and the extent of the tumor's involvement with other nearby tissue.
... plays a significant role in the detection, diagnosis and treatment of vascular diseases that can lead to stroke, kidney failure or even death. CT is commonly used to assess for pulmonary embolism (a blood clot in the lung vessels), as well as for abdominal aortic aneurysms.
... provides invaluable information in diagnosing and treating spinal problems and injuries to the hands, feet and other skeletal structures because it can clearly show even very small bones as well as surrounding tissues such as muscle and blood vessels.
Multi-slice Technology
The multi-slice CT scanner speeds diagnosis and treatment of patients, including trauma patients with severe injuries. The multi-slice CT scanner is similar in appearance to the conventional spiral CT. The difference is in the number of images or slices the scanner generates per second. As the X-ray source and detectors move around the patient, the multi-slice CT captures up to four slices simultaneously. Using the multi-slice CT, patients do not have to hold their breath for as long, and the technician uses less contrast material.
How is the test performed?
The technologist begins by positioning the patient on the CT examination table, usually lying flat on the back or possibly on the side or stomach. Straps and pillows may be used to help maintain the correct position and to hold still during the exam.
If contrast material is used, it will be swallowed, injected through an intravenous line (IV) or administered by enema, depending on the type of examination.
Next, the table will move quickly through the scanner to determine the correct starting position for the scans. Then, the table will move slowly through the machine as the actual CT scanning is performed. Patients may be asked to hold their breath during the scanning.
Most exams are quick – lasting only a few minutes. When the examination is completed, patients will be asked to wait until the technologist verifies that the images are of high enough quality for accurate interpretation.
What can the test tell my doctor?
A CT scan produces clearer pictures of internal organs (such as the brain and spinal cord) than regular X-rays. Information from a CT scan can be saved and stored on a computer for further study. Photographs of selected views can also be made. CT Angiography (or CTA) can image blood vessels, such as those that supply the brain.
Are there risks?
The CT scan exposes patients to radiation. However, the benefit of an accurate diagnosis far outweighs the risk. CT scanning is, in general, not recommended for pregnant women unless medically necessary because of potential risk to the baby. Children should have a CT study only if it is essential for making a diagnosis and should not have repeated CT studies unless absolutely necessary. Make sure to let your doctor know if you are allergic to iodine.
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Download a brochure with more details on a CT imaging, including how to prepare and obtaining test results.
-- For more information on the risks and benefits of a CT scan, see the RadiologyInfo website.
CT Scan Locations:
Advanced Imaging at Sentara Heart Hospital, Norfolk
Advanced Imaging Center, BelleHarbour
Advanced Imaging Center, First Colonial, Virginia Beach
Advanced Imaging Center, Sentara Independence
Advanced Imaging Center, Leigh, Norfolk
Advanced Imaging Center, Sentara Port Warwick, Newport News
Advanced Imaging Center, Sentara Princess Anne, Virginia Beach
Advanced Imaging Center – Greenbrier, Chesapeake
Advanced Imaging Center, Sentara St. Luke's, Isle of Wight
Advanced Imaging Center, Wainwright, Norfolk
Geddy Outpatient Center, Williamsburg
Sentara CarePlex Hospital, Hampton
Sentara Leigh Hospital, Norfolk
Sentara Norfolk General Hospital
Sentara Obici Hospital, Suffolk
Sentara Princess Anne Hospital
Sentara Virginia Beach General Hospital
Sentara Williamsburg Regional Medical Center
Smithfield Imaging Center, Smithfield