for various setups. (a, d) Phantoms used with two and ten materials respectively. (b, e) Reconstructions using one channel. The mislabeled yellow pixels are because the attenuation of the yellow material is very close to zero. (c, f) Reconstructions using ten channels.[]{data-label="fig:Recs"}](figure11.eps "fig:"){width="\textwidth"}

[0.3]{} ![Reconstructions for various setups. (a, d) Phantoms used with two and ten materials respectively. (b, e) Reconstructions using one channel. The mislabeled yellow pixels are because the attenuation of the yellow material is very close to zero. (c, f) Reconstructions using ten channels.[]{data-label="fig:Recs"}](figure12.eps "fig:"){width="\textwidth"}

[0.3]{} ![Reconstructions for various setups. (a, d) Phantoms used with two and ten materials respectively. (b, e) Reconstructions using one channel. The mislabeled yellow pixels are because the attenuation of the yellow material is very close to zero. (c, f) Reconstructions using ten channels.[]{data-label="fig:Recs"}](figure13.eps "fig:"){width="\textwidth"}

We have investigated the effect of changing the parameters that are shown in Table \[tab:Parameters\]. The number of starting iterations has no effect on the pixel error percentage curve. For these parameters, we found that increasing the number of MC-DART iterations further than $4$ had no significant effect on the reconstructions. This threshold depends on the number of ARM iterations in each MC-DART iteration. Also, the quality 