Patent ID: 6339652
Filing Date: 2002-01-15
Classification: A61B,G01T

Abstract:
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 and measured transmission projection data, wherein said measured transmission projection data is truncated; (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; (ii) the reprojection of the previous emission map which is carried out with the multi-dimensional projection model; and (iii) the measured transmission projection data.