Figure 8.

Reconstruction of the FORBILD thorax phantom with Poisson noise added to the data, assuming an emission of 150 000 photons per ray. The standard deviation measurements reported in table 2 were evaluated in the rectangular areas. Top left: combined reconstruction $\overline{V^{*}}$. Top right: reconstruction V*(0), which is based only on the M-line surfaces defined with w_surf = 0. Middle left: reconstruction V*(w_max), which is based only on the surfaces defined with w_surf = w_max. Middle right: reconstruction V*(w_min), which is based only on the surfaces defined with w_surf = w_min. Bottom left: ground truth. Bottom right: difference image between $\overline{V^{*}}$ and V*(0). The following grayscale window was used in all cases: [−50, 50] HU.