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Source-assisted attenuation correction for emission computed tomography

  • US 6,310,968 B1
  • Filed: 11/24/1998
  • Issued: 10/30/2001
  • Est. Priority Date: 11/24/1998
  • Status: Expired due to Term
First Claim
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1. A method of ML-EM image reconstruction for use in connection with a diagnostic imaging apparatus that generates projection data comprising:

  • (a) collecting projection data including measured emission projection data;

    (b) assuming an initial emission map;

    (c) assuming an initial attenuation map;

    (d) iteratively updating the emission map and the attenuation map;

    (e) with each iteration, recalculating the emission map by taking a previous emission map and adjusting it based upon;

    (i) the measured emission projection data;

    (ii) a reprojection of the previous emission map which is carried out with a multi-dimensional projection model; and

    , (iii) a reprojection of the attenuation map; and

    , (f) with each iteration, recalculating the attenuation map by taking a previous attenuation map and adjusting it based upon;

    (i) the measured emission projection data; and

    , (ii) the reprojection of the previous emission map which is carried out with the multi-dimensional projection model.

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