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Tomographic imaging with concentric conical collimator

  • US 4,825,454 A
  • Filed: 12/28/1987
  • Issued: 04/25/1989
  • Est. Priority Date: 12/28/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus useful in tomographic imaging comprising:

  • a source of penetrating radiation, means for forming radiation emitted by said source into a beam of defined cross section and for directing said beam along a path to a target volume,means for supporting an object to be imaged in said target volume so that said beam intercepts said object,a focused collimator located between said target volume and said source, said collimator comprising a plurality of concentric frusto-conical wall sections, adjacent pairs of said wall sections defining scattered radiation transmitting pathways, said pathways originating in a region of said object through which said beam passes, said collimator including a axial passageway, coincident with a rotational axis of all said frusto-conical sections and colinear with said path of said radiation beam,a scattered radiation detector assembly adjacent to said focused collimator and located between said focused collimator and said source, said scattered radiation detector assembly having a central opening to accommodate said path of said radiation beam.

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