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CAT scans 2

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  • 1. Computerized Axial Tomography (CAT) SCANS By Abby Jeffers And James Kloss
  • 2. Before CAT Scans
    • The problems with x-rays:
    • X-ray radiographs offer only a two-dimensional image
    • In a radiograph, a 3-D mass becomes a 2-D image and it is hard to tell individual tissues apart
    • It is difficult to determine which bones and tissues are overlying and which are underlying http://www.asnt.org/publications/materialseval/basics/may00basics/may00basics.htm
  • 3. Development of CAT Scans
    • Godfrey Hounsfield and Allan Cormack are credited as the inventors of the CAT scan
    • Cormack developed the theoretical principals behind reconstructing 2-dimensional images into one 3-D image
    • Hounsfield was the designer and builder of the first CAT scan machines
    • ( http://www.aps.org/publications/apsnews/200411/history.cfm )
  • 4. Evolution of the CAT scan
    • First-generation CAT scanners had one x-ray source and one detector, which rotated around the patient
    • Today, fifth-generation scanners have detectors and x-ray tubes that are switched on one at a time all around the patient.
  • 5. Overview of CAT Scans
    • CAT scans are noninvasive medical tests to help doctors diagnose patients and treat their medical conditions.
    • Uses X-rays and a computer to create images of the inside of the human body.
    • These scans can help doctors diagnose major medical problem and disease.
  • 6. What do they scan for in the body
    • CAT scans internal organs, bones, soft tissue, and blood vessels.
    • CAT scans provide better clarity than X-rays and reveals more important details than X-rays too.
  • 7. How do they work
    • In many ways CAT scans work very much like any other X-ray examination devices.
    • In conventional X-rays small burst of radiation are aimed a the body and shot through the body.
    • The result if a image that is recorded on photographic film or a special image recording plate.
  • 8. How do they work 2
    • Now CAT scans are very similar to X-rays because in a CAT scan there are numerous X-rays that rotate around A
    • At the same time the X-rays are shooting beams of radiation that is being received by X-ray detectors on the opposite side of the patient.
    • At the same time the examination table that you are laying on moves in and out of the machine.
    • The movement of the table creates a spiral path for the X-ray beam to follow.
  • 9. How do they work 3
    • The CAT scan shoot X-ray beams at every angle for 360 ° around the body.
    • A special computer process this large amount of data and produces a 2-D cross section of the human body.
    • This technique is called Helical or Spiral CAT
  • 10. Benefits of CAT scan
    • It is painless, noninvasive, and very accurate.
    • CAT scans can provide information on bone, soft tissue, and blood vessels all at the same time.
    • Fast and simple
    • Provides real time imaging
    • No radiation remains in patients body after CAT scan.
  • 11. Risks of CAT scans
    • Slight chance of cancer from excessive exposure to radiation.
    • Pregnant women should not use CAT scans unless needed to because of the potential risk to the baby.
    • Children should not have too many CAT scans because they are more sensitive to radiation.
  • 12. What they look like
    • CAT scans are typically a large box like machine with a hole or a short tunnel in the center.
    • There is a examination table that slides into and out of the tunnel.
    • The computer workstation the process information from the scan is located in a separate room.
  • 13. Works Cited
    • http://www.asnt.org/publications/materialseval/basics/may00basics/may00basics.htm
    • http://www.aps.org/publications/apsnews/200411/history.cfm
    • http://www.radiologyinfo.org/en/info.cfm?pg=bodyct#part_one
    • http://www.mayfieldclinic.com/pe-ct.htm