Table 3.

Percent normal brain volumes receiving doses equal to or higher than 18, 24, and 45 Gy with intensity‐modulated radiation therapy (IMRT) and three‐dimensional conformal radiation therapy (3D‐CRT) plans

	Volume (%)
	$\ge 18$ Gy		$\ge 24$ Gy		$\ge 45$ Gy
Case	IMRT	3D‐CRT	IMRT	3D‐CRT	IMRT	3D‐CRT
1	59.77	40.39	45.31	37.47	13.27	22.95
2	63.15	48.48	53.18	45.29	24.7	34.59
3	33.8	50.52	28.42	35.67	11.51	13.67
4	51.55	66.49	38.62	60.48	12.09	18.97
5	40.06	23.51	26.23	21.06	6.81	12.98
6	33.52	35.6	27.49	22.56	6.71	5.81
7	62.24	76.01	48.41	64.84	9.4	16.26
8	40.17	52.22	25.96	34.51	5.24	13.94
9	32.65	35.51	21.8	23.66	3.68	6.56
10	56.48	46.42	44.53	37.86	7	7.5
11	50.47	63.3	38.37	44.04	12.39	20.04
12	34.84	46.23	27.48	27.71	7.78	8.24
13	24.27	32.72	19.55	24.65	5.31	8.32
14	55.41	65.59	40.25	49.36	8.35	19.34
15	17.27	23.7	10.63	11.66	1.7	3.38
16	45.24	62.93	31.08	46.54	6.85	9.88
17	58.11	69.98	40.15	54.27	8.21	24.83
18	48.62	57.02	32.35	52.77	7.69	22.49
19	60.2	73.1	44.04	51.29	16.4	23.97
20	62.9	63.86	47.41	56.19	14.39	23.05
Mean	46.54	51.68	34.56	40.09	9.47	15.84
p Value	$=0.059$		$=0.015$		$<0.0001$