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PTV inhomogeneity coefficient.
| Range (%) | Mean (%) | P value (Wilcoxon rank sum test) | |
|---|---|---|---|
| IMXT | 5.8–8.6 | 6.8 | |
| 3D CPT | 2.1–7.1 | 4.0 | 0.015 |
| IMPT | 6.7–8.8 | 7.5 | 0.121 |
Inhomogeneity coefficient = radiation dose delivered to 5% of the target tissue (D5%)−dose to 95% of the target tissue (D95%)/D95%.
