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Figure 5
Comparison of reconstructions of the 3-D BrainWeb phantom corrupted with streak and Poisson noise as in (3)[link], corresponding to the sinograms shown in Fig. 4[link]. Top: ground truth volume, and reconstructions of ln(A) (3)[link] and Z (4)[link] obtained through filtered back-projection. Bottom: comparison of TV reconstruction of estimates with various regularization strengths r, where the percentage implies a multiplier to the regularization optimized to maximize SNR, i.e. 100% means `SNR-optimal' regularization. Top-to-bottom: proposed full estimate ln(A), proposed streak-free estimate [\hat{Y}], and streak-free estimate of [\hat{Y}] (Vo et al., 2018)BB35, each with 100%, 50%, and 150% relative regularization strengths. Proposed estimates are computed embedding the improved BM4D. Notably, the full filtering offers improved reconstruction quality, and is also less sensitive to variations in the regularization parameters.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 29| Part 3| May 2022| Pages 829-842
https://doi.org/10.1107/S1600577522002739
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