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Calibration apparatus for X-ray geometry

  • US 5,835,563 A
  • Filed: 12/21/1995
  • Issued: 11/10/1998
  • Est. Priority Date: 12/21/1995
  • Status: Expired due to Fees
First Claim
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1. Calibration apparatus for X-ray geometry, for use in conjunction with a portion of a patient'"'"'s body to be X-rayed, an X-ray source, and imaging means for forming an image, wherein said imaging means is at a given orientation and distance from said portion of a patient'"'"'s body, said apparatus comprising:

  • a calibration ring adapted for being fastened to a portion of a patient'"'"'s body, said ring exhibiting a first degree of transparency to X-rays and being positioned such that one side of said calibration ring is proximate said X-ray source and the opposite side is distal thereto; and

    encoding means incorporated in said ring, comprising a plurality of encoding units exhibiting a second degree of transparency to X-rays, different from said first degree, said encoding units being arranged in a predetermined configuration such that an essentially two-dimensional projected image, formed by said imaging means, of said calibration ring with said encoding means exhibits a pattern of contrasting intensity attributable to at least a portion of said encoding means incorporated in said proximate side of said calibration ring and at least a portion of said encoding means incorporated in said distal side, from which said orientation and distance can be determined uniquely.

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