Table 2 Descriptive statistics of dosimetric parameters
Parameter (mean [SD]) | DCAT | IMRT | VMAT |
|---|---|---|---|
Conformity index | |||
RTOG | 1.6 (0.2) | 1.9 (0.4) | 1.5 (0.2) |
Paddick | 0.66 (0.089) | 0.56 (0.079) | 0.69 (0.079) |
Gradient index | 3.0 (0.5) | 3.4 (0.5) | 3.4 (0.4) |
Homogeneity index | 1.3 (0.01) | 1.3 (0.1) | 1.3 (0.03) |
Tumour | |||
Dmean (Gy) | 14.2 (0.1) | 14.6 (0.6) | 14.5 (0.4) |
D98% (Gy) | 13.0 (0.4) | 13.4 (0.4) | 13.2 (0.7) |
D2% (Gy) | 15.1 (0.1) | 15.3 (0.7) | 15.5 (0.4) |
Brainstem | |||
D0.03cc (Gy) | 10.3 (3.7) | 9.0 (4.5) | 8.3 (4.2) |
D1cc (Gy) | 4.6 (2.5) | 4.1 (2.6) | 3.5 (2.2) |
Cochlea | |||
D0.03cc (Gy) | 6.0 (1.8) | 6.1 (2.5) | 3.6 (1.8) |
Dmean (Gy) | 5.7 (1.6) | 5.5 (2.3) | 3.4 (1.7) |