Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40658-020-00323-w/MediaObjects/40658_2020_323_Fig4_HTML.png)
Image roughness as a function of the number of net trues. Data reconstructed from the mCT (set as the reference) using 3 iterations, 21 subsets, and no post-filtering (matrix size 200 × 200). Vision data were reconstructed using 5 subsets, no post-filtering, and between 3 to 5 iterations. a 440 × 440 and b 220 × 220 matrix size. Data were fitted using a bi-exponential to ease the visual interpretation