Table 3.

Statistical analysis of indices for PTV_WBRT in IMRT plans

Indices	Plan A	Plan B	t value	p value
PITV	1.18 ±0.08	1.15 ±0.06	1.269	0.213
HI	0.45 ±0.11	0.27 ±0.06	6.047	0.000
TC	0.98 ±0.02	0.96 ±0.02	2.33	0.026
V95 (%)	99.71 ±0.24	99.61 ±0.30	1.668	0.114

PITV – prescription isodose to target volume ratio; HI – homogeneity index;

TC – target coverage; V₉₅ – the volume receiving at least 95% of the prescribed dose in the PTV

The two-tailed p values were results from independent-sample t-tests.