A comparison of liver protection among 3-D conformal radiotherapy, intensity-modulated radiotherapy and RapidArc for hepatocellular carcinoma

Table 3 Summary of the dosimetric results for PTVs, MUs and delivery time

PTV	3DCRT	IMRT	RA	P-value
PTV	3DCRT	IMRT	RA	a	b	c
V_95% (%)	99.73 ± 0.28	99.25 ± 1.2	99.23 ± 1.21	0.240	0.067	0.65
V_100% (%)	80.57 ± 1.23	79.83 ± 4.01	78.56 ±3.50	0.21	0.23	0.52
V_110% (%)	9.33 ± 8.58	3.12 ± 3.09	2.12 ±1.56	0.002	0.50	0.008
CI	0.72 ±0.03	0.83 ±0.04	0.84 ±0.05	0.000	0.633	0.000
HI	1.16 ±0.01	1.08 ±0.03	1.09 ± 0.03	0.072	0.623	0.041
MU	250.4 ± 16.20	853.2 ± 299.2	435.5 ± 134.8	0.000	0.007	0.002
Time (min)	0.92 ± 0.05	2.18 ± 1.10	0.75 ±0.13	0.000	0.000	0.332

Statistical significance (p <0.05) is reported between couples from paired t-test analysis. Abbreviations: PTV planned tumor volume, 3DCRT 3-D conformal radiation therapy, IMRT intensity-modulated radiation therapy, RA RapidArc, V_x% the volume receiving ≥ x% of the prescribed dose, CI conformity index, HI homogeneity index, MU monitor unit. a, IMRT versus 3DCRT; b, IMRT versus RA; c, RA versus 3DCRT.

ISSN: 1748-717X