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Method and apparatus for acquiring a uniform distribution of radon data sufficiently dense to constitute a complete set for exact image reconstruction of an object irradiated by a cone beam source

  • US 5,365,560 A
  • Filed: 07/29/1991
  • Issued: 11/15/1994
  • Est. Priority Date: 07/29/1991
  • Status: Expired due to Term
First Claim
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1. A method for acquiring discrete cone beam projection data along a three dimensional (3D) scanning trajectory in order to obtain a substantially uniform distribution of Radon data that is sufficiently dense to ensure the acquisition of a complete set of Radon data wherein said Radon data is organized onto a plurality of co-axial planes for exact image reconstruction of an object irradiated by a scanning cone beam source, said method comprising the steps:

  • ensuring substantially equivalent signal-to-noise ratio among cone beam projection data;

    providing a 3D scanning trajectory such that at least a composite of corresponding planar projections of said trajectory forms a continuous, convex, closed curve about a corresponding planar projection of the object being scanned, the step of providing a 3D scanning trajectory further comprising selecting respective portions from a plurality of 3D scanning trajectory projections onto respective planes of said plurality of co-axial planes to collectively form a continuous, convex, closed curve enclosing the respective projection of said object; and

    discretely sampling at a corresponding plurality of cone beam source positions along said scanning trajectory in a manner providing uniformity in said distribution of Radon data.

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