Figure 4.

Monoenergetic HU Stability plotted by the technique parameter isolated as a major variance contributor in Table 9: mAs for both the DEQC body (left) and head phantom (right). Results are shown for all monoenergetic reconstructions investigated (50, 70, 110 and 140 keV). Monoenergetic HU Stability is represented as the average of all voxels across the soft tissue inserts in the phantom (see Fig. 1 for soft tissue insert positioning). Error bars represent standard deviation across 10 scanners and 13 weeks.