Table 4(b).
Statistical analysis of the percent dose difference of dose calculation in low‐dose buildup region far away from PTV (beyond 1.4 cm extra margin from PTV) at specific points on 2 mm strips surface at different depth from skin by two algorithms (AAA and PBC) using Wilcoxon signed‐tank test showing significant differences between these two at all depths.
| (PBC‐meas)/meas vs (AAA‐meas)/meas | Type of Ranks | N | Mean Rank | Sum of Ranks | Z | p‐value (2‐tail) |
|---|---|---|---|---|---|---|
| Negative Ranks | 5 | 7.60 | 38.00 | ‐1.25 | 0.211 | |
| 2 mm Depth | Positive Ranks | 10 | 8.20 | 82.00 | ||
| Ties | 0 | |||||
| Total | 15 | |||||
| Negative Ranks | 4 | 8.55 | 34.00 | ‐0.805 | 0.422 | |
| 4 mm Depth | Positive Ranks | 9 | 6.33 | 57.00 | ||
| Ties | 0 | |||||
| Total | 13 | |||||
| Negative Ranks | 7 | 5.43 | 38.00 | ‐0.078 | 0.937 | |
| 6 mm Depth | Positive Ranks | 5 | 8.00 | 40.00 | ||
| Ties | 0 | |||||
| Total | 12 |