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Method and system for noise reduction in low dose computed tomography

  • US 9,189,832 B2
  • Filed: 04/27/2011
  • Issued: 11/17/2015
  • Est. Priority Date: 06/21/2010
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • de-noising projection data from a lower dose scan in the projection domain, wherein the lower dose scan corresponds to a scan which produces image data with a noise level that is higher than a predetermined target image data noise level;

    reconstructing the de-noised projection data to generate volumetric image data;

    determining a noise level of the image data;

    estimating a noise level for the image data of the higher dose scan;

    determining a ratio of the noise level of the higher dose scan to the noise level of the image of the lower dose scan; and

    de-noising the volumetric image data in the image domain based on the ratio.

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