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Relative SPR estimation errors for human tissues from each investigated method as a function of sinogram source intensity levels: (a) mean error for all pixels within ROIs, which equals the mean of average estimation errors for different tissues; (b) RMS of average estimation errors for different tissues (RMS‐average error); and (c) RMS errors for all pixels within ROIs. The seven methods are listed in Table 2. [Color figure can be viewed at wileyonlinelibrary.com]
