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Methods and apparatus for calibrating CT x-ray beam tracking loop

  • US 6,310,938 B1
  • Filed: 08/27/1999
  • Issued: 10/30/2001
  • Est. Priority Date: 08/27/1999
  • Status: Expired due to Term
First Claim
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1. A method for determining tracking control parameters for positioning an x-ray beam of a computed tomography imaging system, the imaging system including a movable collimator positionable in steps and a detector array including a plurality of rows of detector elements, said method comprising the steps of:

  • obtaining detector samples at a plurality of collimator step positions while determining a position of a focal spot of the x-ray beam;

    determining a beam position for each detector element at each collimator step utilizing the determined focal spot positions, a nominal focal spot length, and geometric parameters of the x-ray beam, collimator, and detector array;

    determining a detector element differential error according to ratios of successive collimator step positions; and

    selecting a target beam position for an isocenter element in accordance with the determined element differential errors.

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