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Reconstruction of images in cone beam scanning with rectangular detector elements

  • US 5,461,651 A
  • Filed: 11/17/1993
  • Issued: 10/24/1995
  • Est. Priority Date: 11/17/1993
  • Status: Expired due to Term
First Claim
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1. A method of computerized tomography comprising the steps of:

  • (a) generating imaging energy;

    (b) passing the imaging energy through an object of interest;

    (c) using an array detector having non-square elements to detect said imaging energy as attenuated by passage through the object of interest to provide asymmetric projection data corresponding to an asymmetric grid in which at least a portion of the object of interest is disposed;

    (d) converting said asymmetric projection data into distorted projection data which is symmetric corresponding to a symmetric grid, said distorted projection data representing projection data which would be obtained upon subjecting said portion of said object of interest to a distorting transformation which transforms said asymmetric grid into said symmetric grid;

    (e) Generating distorted reconstruction image data by application of image reconstruction in symmetric geometry using said distorted projection data; and

    (f) converting said distorted reconstructed image data into asymmetric reconstructed image data by correcting for distortions introduced by the converting from asymmetric projection data into distorted projection data.

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