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X-ray position measuring and calibration device

  • US 5,500,886 A
  • Filed: 04/06/1994
  • Issued: 03/19/1996
  • Est. Priority Date: 04/06/1994
  • Status: Expired due to Term
First Claim
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1. A calibration system for determining the angular directions θ

  • , φ

    of a beam of radiation, said system comprising;

    a radiation source generating said beam of radiation at said angular direction θ

    measured with respect to a first direction;

    a first reference element exposed to said beam of radiation and separated from said radiation source by a distance of approximately Z1 ;

    a second reference element exposed to said beam of radiation and separated from said first reference element by a predetermined distance H;

    an image detector producing a first image of said first reference element and a second image of said second reference element; and

    an angle measurement device calculating said angle θ

    from said distances H and Z1.

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