Scanner Valid MTR interval % trimmed on left % trimmed on right A 25-44 6.6% 5% B 4-28 6.7% 6.2% C 17-35 6.4% 6.5% D600 42-54 7.5% 6.1% D1200 30-44 5.7% 7.1%

Table 1: Valid ranges of voxel based MTRs and actual amounts of trims for scanners. Percentages were chosen to be as close to 6.5% as possible subject to the discrete nature of MTRs.