Table 2 Mean dose-volume data and standard deviations for 8 NPC patients comparing IMPT with IMRT
Target | Parameter | IMPT | IMRT | P value | ||
|---|---|---|---|---|---|---|
Mean +/- 1SD | Mean +/- 1SD | |||||
GTV-T | D99 | 66.6 | 6.1 | 64.9 | 4.2 | 0.195 |
D1 | 74.8 | 1.1 | 76.1 | 0.8 | 0.008 | |
D. mean | 72.4 | 0.4 | 72.2 | 0.4 | 0.148 | |
SD | 1.4 | 1.07 | 2.2 | 0.9 | 0.008 | |
V95 | 97.6% | 3% | 93% | 6% | 0.016 | |
V105 | 0.5% | 0.9% | 1.6% | 2% | 0.063 | |
CI | 2.36 | 1.07 | 4.69 | 3.59 | 0.008 | |
IC | 0.11 | 0.1 | 0.17 | 0.09 | 0.016 | |
PTV-TN | D99 | 52.5 | 4.2 | 55.3 | 2.2 | 0.039 |
D1 | 73.4 | 0.6 | 74.7 | 0.7 | 0.008 | |
D. mean | 66.5 | 0.4 | 66.5 | 0.2 | 0.844 | |
SD | 3.4 | 0.7 | 3.8 | 0.54 | 0.188 | |
V95 | 93.3% | 2% | 87.7% | 3% | 0.008 | |
V105 | 12.2% | 5% | 19.7% | 4% | 0.008 | |
CI | 1.02 | 0.07 | 1.12 | 0.12 | 0.016 | |
IC | 0.32 | 0.07 | 0.32 | 0.05 | 0.844 | |
PTV-N | D99 | 45 | 2.3 | 44.7 | 0.9 | 0.945 |
D1 | 72.5 | 1.2 | 73.6 | 1.2 | 0.008 | |
D. mean | 59.3 | 2.7 | 59.5 | 2.3 | 0.742 | |
SD | 6.7 | 0.84 | 7 | 0.92 | 0.219 | |
V95 | 95.4% | 2% | 92.0% | 2% | 0.016 | |
V105 | 52.9% | 17.9% | 60.5% | 13.8% | 0.047 | |
CI | 1.11 | 0.06 | 1.32 | 0.12 | 0.016 | |
IC | 0.55 | 0.07 | 0.6 | 0.05 | 0.383 | |