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Method of and means for scanning a body to enable a cross-section thereof to be reconstructed

  • US 4,149,079 A
  • Filed: 07/14/1976
  • Issued: 04/10/1979
  • Est. Priority Date: 07/14/1976
  • Status: Expired due to Term
First Claim
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1. In apparatus for calibrating a scanner of the type having a source for producing at least one pencil beam of penetrating radiation originating at essentially a point and passing through a cross-section to be reconstructed, a detector mounted in predetermined relationship to the source for measuring the intensity of the beam emerging from the cross-section, and means for rotating the source in a circular path coplanar with the cross-section, the improvement comprising means for periodically interrupting the beam during rotation of the source through a portion of the revolution, and means responsive to radiation from a reference source incident on the detector for calibrating the detector during the interval that the beam is interrupted.

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