CT Scanning

  • Created by: cjt123
  • Created on: 14-04-16 10:50
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  • CT Scanning
    • Uses
      • CT scanning can be used to measure bone mineral density for the detection of osteoporosis
      • It has a role in the detection, diagnosis and treatment of heart disease, acute stroke and vascular diseases
      • CT has excellent application in trauma cases to look for major internal injuries such as internal bleeding
      • It is an invaluable tool in cancer diagnosis
      • It is used extensively to diagnose problems of the inner ears and sinuses
        • CT creates very high resolution images
    • Advantages
      • Takes a relatively short time to complete
      • Can be used on all regions on the body
      • CT creates very high resolution images
      • CT enables direct imaging and shows the difference between soft tissue structures
    • Disadvantages
      • The radiation dose is about 100 times that of standard x-ray
      • It is considerably more expensive than standard x-ray
        • Both x-ray and CT scanning require considerable patient preparation in certain cases
          • The radiation dose is about 100 times that of standard x-ray
    • How it Works
      • CT has the unique ability to image a combination of soft tissue, bone and blood vessels
      • Comines the use of a digital computer with a rotating x-ray device to create detailed cross-sectional images
      • The length of the test depends on the number of pictures and the different angles taken
        • A test will typically take no more than 5 seconds
      • The patient lies of a bed with the body part under examination in the scanner while the bed moves backwards and forwards slowly through the machine
        • An x-ray tube is rotated around the patient and the large number of detectors surrounding the patient send signals to a computer which reconstructs the images


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