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- A Brief History of CT Scan and MRI
- The CT Scan Imaging Guarantee
- Common Uses of the CT Scan
- CT Scan Preparation
- The CT Scan Equipment
- The CT Scan Procedure
- Effects of CT Scan
Great Vacation
All About Cosmetic Dentistry
Implant FAQs
plus
Before and After Photos of Patients
All About CT Scan of the Sinuses
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In many ways CT scanning works very much like other x ray examinations. X rays are a form of radiation like light or radio waves that can be directed at the body. Different body parts reflect the x rays in varying degrees. In a conventional x-ray exam, a small burst of radiation is aimed at the body, recording an image on photographic film or a special image recording plate. Bones appear white on the x-ray; soft tissue shows up in shades of gray and air appears black. With CT scanning, numerous x-ray beams and a set of electronic x-ray detectors rotate around you. At the same time, the examination table is moving through the scanner, so that the x-ray beam follows a spiral path. A special computer program processes this large volume of data to create two-dimensional cross-sectional images of your body, which are then displayed on a monitor. This technique is called helical or spiral CT. CT imaging is sometimes compared to looking into a loaf of bread by cutting the loaf into thin slices. When the image slices are reassembled by computer software, the result is a very detailed multidimensional view of the body's interior. Refinements in detector technology allow new CT scanners to obtain multiple slices in a single rotation. These scanners, called "multislice CT" or "multidetector CT," allow thinner slices to be obtained in a shorter period of time, resulting in more detail and additional view capabilities. Modern CT scanners are so fast that they can scan through large sections of the body in just a few seconds. Such speed is beneficial for all patients but especially children, the elderly and critically ill. For some CT exams, a contrast material is used to enhance visibility in the area of the body being studied. How is the CAT scan performed? The technologist begins by positioning you on the CT examination table, usually lying flat on your back or possibly on your side or on your stomach. Straps and pillows may be used to help you maintain the correct position and to hold still during the exam. 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. You may be asked to hold your breath during the scanning. Any motion, whether breathing or body movements, can lead to artifacts on the images. This is similar to the blurring seen on a photograph taken of a moving object. When the examination is completed, you will be asked to wait until the technologist verifies that the images are of high enough quality for accurate interpretation. CT scanning of the body is usually completed within 30 minutes. |
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