Table 2.
Overview of the acceptance thresholds applied to the geometric, CT number, and dose deviation metrics. For each metric, the acceptable (green), marginal (yellow), and unacceptable (red) thresholds and the supporting references are provided. Abbreviations: DSC = Dice Similarity Coefficient, HD95 = 95th Percentile Hausdorff Distance, HU = Hounsfield Units, ME = Mean Error, |%ΔX| = absolute value of the signed percentage difference of DVH metric X (D₂%, D₉₈%, or Dmean), as defined in Eq. (1).
| Metric | Acceptable (green) |
Marginal (yellow) |
Unacceptable (red) |
References |
|---|---|---|---|---|
| Bone DSC | ≥ 0.8 | 0.6 ≤ DSC < 0.8 | < 0.6 | [28], [29], [30], [31], [32], [33], [34], [35], [36] |
| Bone HD95 (mm) | ≤ 2.0 | 2.0 < HD95 ≤ 5.0 | > 5.0 | [4], [33], [37], [38] |
| Bone |ME| (HU) | ≤ 100 | 100 < |ME| ≤ 400 | > 400 | [30], [33], [35], [36], [39] |
| Soft-tissue |ME| (HU) | ≤ 10 | 10 < |ME| ≤ 20 | > 20 | [33], [35], [36] |
| |%ΔX| | ≤ 1.0 | 1.0 < |%ΔX| ≤ 2.0 | > 2.0 | [30], [31], [33], [34], [35], [36], [40], [41], [42], [43], [44] |