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Medical What is Physical Principle for CT ?

  1. Jan 1, 2010 #1
    Hello

    How are u ?

    please help me

    What is Physical Principle for CT ( Computed Tomography ) ?
     
  2. jcsd
  3. Jan 1, 2010 #2

    mgb_phys

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    Science Advisor
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    It's just a series of 1d x-rays
    You shoot an x-ray through the victim at a range of angles
    You then divide the body into a series of boxes (in a computer) and work out what density you would out in each box so that a ray through a line of boxes gives the same total absorption as you measured with the x-ray along that same line

    The details of how you do the sums depends on the system, but it's basically just a matrix inversion
     
  4. Jan 4, 2010 #3

    berkeman

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    Staff: Mentor

    Good summary by mgb. For lots more reading:

    http://en.wikipedia.org/wiki/X-ray_computed_tomography

    (but keep in mind that some of that article may be controversial -- I think mainly in the safety area, but maybe in other areas too).
     
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