Computed Tomography
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Definition
A medical imaging method employing tomography. Also known as a CAT scan
Reading the Results
The denser the tissue, and the higher the atomic number, the whiter the CAT image is. Bone and calcium appear white; air in the lungs appears black; water, blood, and internal organs such as liver, kidneys, and intestines appear gray; and fat tissue appears dark gray.
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How it Works
- You lay on a CAT table
- Your arms will be raised above your head.
- After proper positioning, the technologist will move to the console room, and start exposing X-ray to your body.
- Once the X-ray tube rotates around your body 360 degrees to take one cross- sectional image, the table will move a little bit to get the next slice.
- You will be asked to hold your breath at each scanning.
- You will be alone in the exam room during X-ray exposure, but you can talk and listen to your technologist using the intercom, or by raising your hands to communicate. The technologist will watch you during the scanning through a glass window and video camera.
- If a contrast medium is required to make organs and blood vessels stand out, it will be injected into your vein during the exam.
- The exam usually takes from ten minutes to one half hour.
Disadvantages
- Very expensive
- Not very accessible to the public
- Limited due to amount of radiation exposure
Advantages
- Non-invasive
- Provides detailed images
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