ホットスポットファントムを用いたOSEM再構成画像の基礎的検討 : iteration回数およびsubset数の評価

概要

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To investigate optimal iteration times and the number of subsets on OSEM(ordered subsets expectation maximization), we estimated the values of the target-to-background ratio(T/B), signal-to-noise ratio(S/N), and NMSE(normalized mean square error). We acquired SPECT data with four scan durations, 5, 10, 15, and 20 min, using a three-headed SPECT scanner(GCA-9300 A/UI, Toshiba Co., Ltd.), and reconstructed the OSEM algorithm varying iteration and subset numbers. We determined the optimal values of T/B, S/N, and NMSE for OSEM, and compared these by filtered back projection(FBP). We observed the same convergence propotity between OSEM and FBP. We evaluated this by comparing it with the FBP method to obtain the most appropriate parameter from 36 kinds of SPECT images. In the spherical hot spot phantom study, the values of 2 and 15 were optimum for iteration times and number of subsets, respectively.
公益社団法人日本放射線技術学会の論文
2001-10-20