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

Table 2 Summary of the dosimetric results for OARs

	3DCRT	IMRT	RA	P-value
	3DCRT	IMRT	RA	a	b	c
Liver D_mean (Gy)	20.57 ± 7.12	22. 34 ± 7.33	20.51 ± 7.12	0.045	0. 051	0.060
Liver V₅ (%)	68.9 ± 19.23	70.43 ± 18.92	76.34 ± 19.12	0.02	0.015	0.007
Liver V₁₀ (%)	60.37 ± 21.54	65.12 ± 21.62	64.71 ± 21.63	0.274	0.031	0.004
Liver V₂₀ (%)	48. 34 ± 21.13	47.73 ±22.81	43. 94 ± 20.10	0.34	0.23	0.012
Liver V₃₀ (%)	22.27 ±17..30	22.57 ± 15.73	21.93 ±14..30	0.002	0.450	0.013
Liver V₄₀ (%)	27.73 ± 18.73	17.94 ±10.13	17.93 ± 10.24	0.012	0.453	0.038
Stomach D_mean (Gy)	14.3 ± 13.93	14.36 ±10.13	16.13 ±12..34	0.231	0.937	0.073
Left kidney D_mean (Gy)	2.03 ± 2.45	2.13 ±2.98	2.01 ±2.94	0.45	0.270	0.110
Right kidney D_mean (Gy)	6.73 ±8.96	5.13 ± 6.73	4.36 ±6.58	0.134	0.078	0.734
Spinal cord D_1% (Gy)	20.20 ± 8.34	19.23 ± 9.70	14.23 ± 7.92	0.721	0.210	0.372

Statistical significance (p <0.05) was reported between couples from paired t-test analysis. Abbreviations: 3DCRT 3-D conformal radiation therapy, IMRT intensity-modulated radiation therapy, RA RapidArc. V_x the volume of the OARs receiving the dose > x Gy. D_mean the mean dose for the organ, D_1% the maximal dose at 1% volume for the organ. a, IMRT versus 3DCRT; b, IMRT versus RA; c, RA versus 3DCRT.

ISSN: 1748-717X