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Correction algorithm for bone-induced spectral artifacts in computed tomograph imaging

  • US 6,115,487 A
  • Filed: 01/08/1998
  • Issued: 09/05/2000
  • Est. Priority Date: 01/08/1998
  • Status: Expired due to Term
First Claim
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1. A method for correcting an image having dense object-induced spectral artifacts generated using data collected in a computed tomography system, said method comprising the steps of:

  • (a) reconstructing an image BWEQ of a calibration object;

    (b) reconstructing an image WEQ of a water equivalent cylinder having about a same diameter as the calibration object;

    (c) generating a ratio of images BWEQ and WEQ;

    (d) extracting a region of interest by multiplying the generated ratio by a function II(r) to obtain a calibration pattern CP;

    (e) averaging the calibration pattern in azimuth to obtain a calibration vector;

    (f) removing low frequency components from the vector;

    (g) multiplying the result of step (f) by a CT number scale factor (ctscale) and an apodizing window Aw(r) to generate a calibration error vector CEV representative of an image error introduced by the non-corrected dense object-induced artifact.

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