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Method and apparatus for acquiring complete radon data for exactly reconstructing a three dimensional computerized tomography image of a portion of an object irradiated by a cone beam source

  • US 5,383,119 A
  • Filed: 07/03/1991
  • Issued: 01/17/1995
  • Est. Priority Date: 07/03/1991
  • Status: Expired due to Term
First Claim
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1. A computer-related method of acquiring complete Radon data for exact reconstruction of a three dimensional image of a select portion of an object, wherein a region of support in the object space bounds said portion, said region of support in the object space being enclosed within a field of view of at least one cone beam source emitting a beam, said source being fixed with respect to a corresponding detector, said method comprising the steps of:

  • selectively scanning with said beam along a path enclosing said region of support in the object space at the upper and lower extent of said portion respectively, said upper and lower scan paths being joined by a connecting scan path, said upper, lower, and connecting scan paths collectively defining a complete scan path for said select portion;

    selectively partitioning each surface of integration corresponding to a data point in Radon space based on the intersection of said surface with said portion; and

    selectively manipulating corresponding cone beam data according to said partitioning in order to discard data not directly attributable to said portion and recover otherwise missing data directly attributable to said portion.

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