Table 2.

Comparisons of dosimetric parameters of OARs among the 4 HT plans in 20 patients.

OARs	Parameters	2.5FJ	2.5DJ	5.0FJ	5.0DJ	P2.5	P5.0	PF	PD	P*
Spinal cord	Dmax (Gy)	38.20 ± 6.06	38.22 ± 6.05	38.19 ± 5.77	38.22 ± 5.75	0.436	0.51	0.91	0.978	0.888
	D1cc (Gy)	34.50 ± 1.87	34.51 ± 2.16	33.78 ± 2.16	33.82 ± 2.15	0.891	0.277	0.001	0.002	0.002
Brain stem	Dmax (Gy)	60.42 ± 6.54	60.66 ± 6.27	61.82 ± 5.60	61.94 ± 5.49	0.033	0.117	0.01	0.016	0.006
	D1cc (Gy)	53.93 ± 5.65	54.11 ± 5.48	55.45 ± 5.81	55.56 ± 5.66	0.012	0.178	0	0	0
Lens	Dmax (Gy)	6.10 ± 1.01	6.06 ± 1.03	6.39 ± 1.04	6.33 ± 1.04	0.443	0.157	0.003	0.003	0.025
Optic nerve	Dmax (Gy)	49.69 ± 10.46	43.76 ± 17.00	52.29 ± 9.29	46.82 ± 15.08	0.002	0.002	0.002	0	0.052
	Dmean (Gy)	33.77 ± 9.00	28.06 ± 14.33	37.58 ± 7.25	30.91 ± 13.18	0.001	0.001	0	0	0.046
Optic chiasm	Dmax (Gy)	44.02 ± 15.66	35.69 ± 24.21	51.04 ± 11.91	38.35 ± 24.82	0.001	0.001	0	0	0.017
	Dmean (Gy)	38.54 ± 16.34	31.38 ± 22.99	46.56 ± 11.06	33.36 ± 23.27	0	0	0	0.002	0.005
Eyes	Dmean (Gy)	9.96 ± 2.46	9.26 ± 2.87	10.83 ± 2.61	9.73 ± 3.21	0	0	0	0.003	0.351
Parotid	Dmean (Gy)	39.56 ± 2.87	39.53 ± 2.88	40.01 ± 3.05	39.99 ± 3.04	0.033	0.43	0	0	0
Pituitary	Dmax (Gy)	51.84 ± 13.35	48.75 ± 16.87	56.30 ± 1.00	51.73 ± 15.29	0.003	0.006	0	0.001	0.919
	Dmean (Gy)	47.75 ± 14.11	43.32 ± 18.96	53.22 ± 10.19	46.23 ± 17.56	0.001	0.002	0	0	0.162
Temporal lobe	D1cc (Gy)	62.99 ± 6.99	62.98 ± 6.99	65.16 ± 5.52	65.13 ± 5.55	0.68	0.567	0	0	0
	Dmean (Gy)	18.67 ± 5.41	16.31 ± 6.25	24.43 ± 5.16	18.91 ± 7.02	0	0	0	0	0.61
	V60Gy (%)	1.96 ± 2.39	1.95 ± 2.39	2.92 ± 3.05	2.88 ± 3.02	0.163	0.069	0	0	0
Hippocampus	Dmax (Gy)	49.06 ± 13.54	46.70 ± 17.00	53.60 ± 10.13	49.28 ± 16.25	0.066	0.02	0.001	0	0.852
	D1cc (Gy)	29.45 ± 13.38	26.41 ± 16.25	37.57 ± 10.66	31.31 ± 17.56	0.007	0.002	0	0	0.237
	Dmean (Gy)	17.97 ± 6.42	14.60 ± 8.02	25.15 ± 5.38	17.75 ± 9.73	0	0	0	0	0.796

P^2.5: 2.5FJ vs. 2.5DJ; P^5.0: 5.0FJ vs. 5.0DJ; P^F: 2.5FJ vs. 5.0FJ; P^D: 2.5DJ vs. 5.0DJ; P^*: 2.5FJ vs. 5.0DJ.