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Method and apparatus for simplifying the correction of image inaccuracies caused by processing of masked cone beam projection data

  • US 6,330,298 B1
  • Filed: 10/17/2000
  • Issued: 12/11/2001
  • Est. Priority Date: 10/17/2000
  • Status: Expired due to Fees
First Claim
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1. A method for three dimensional (3D) computerized tomographic (CT) imaging of an object, comprising:

  • acquiring a plurality of sets of 2D cone beam projection data by irradiating the object with energy from a cone beam source that is directed toward a 2D detector at a corresponding plurality of scan path source positions located about the object;

    applying a mask to each set of the 2D cone beam projection data to form a corresponding plurality of masked 2D data sets;

    processing line integrals in the 2D cone beam projection data along a plurality of line segments L(s,θ

    ) having their end points determined by the boundaries of each of the masked 2D data sets to develop a corresponding plurality of processed 2D data sets, each processed 2D data set corresponding to calculation of a first data estimate determined for a given set of the 2D cone beam projection data;

    developing 2D correction data for each of the first data estimates by performing a one-dimensional (1D) convolving process on portions of said masked projection data to develop said 2D correction data; and

    combining each of said first data estimates with the 2D correction data developed therefore during an image reconstruction process which reconstructs an exact 3D image of the object.

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