Dosimetric comparison of helical tomotherapy, VMAT, fixed-field IMRT and 3D-conformal radiotherapy for stage I-II nasal natural killer T-cell lymphoma

Table 1 Results of dosimetric comparison for PTV from DVH (\( \overline{x}\pm S \))

Parameters	HT	VMAT	IMRT	3D-CRT	p-Value
Parameters	HT	VMAT	IMRT	3D-CRT	HT VS. VMAT	HT VS. IMRT	HT VS. 3D-CRT	VMAT VS. IMRT	VMAT VS. 3D-CRT	IMRT VS. 3D-CRT
D_98% (Gy)	49.12 ± 0.19	47.43 ± 0.18	47.20 ± 0.10	47.50 ± 0.24	0.000	0.000	0.002	0.181	0.766	0.275
D_2% (Gy)	52.42 ± 0.17	51.31 ± 0.11	51.62 ± 0.19	54.80 ± 0.47	0.000	0.004	0.001	0.055	0.000	0.000
D_mean (Gy)	51.41 ± 0.15	49.75 ± 0.10	49.72 ± 0.18	50.98 ± 0.12	0.000	0.000	0.056	0.862	0.000	0.001
V_95%(%)	99.35 ± 0.19	97.82 ± 0.44	97.10 ± 0.25	97.74 ± 0.48	0.015	0.000	0.024	0.150	0.863	0.279
Cold spot volume (%)	0.42 ± 0.45	0.61 ± 0.37	0.88 ± 0.33	0.95 ± 0.22	0.367	0.036	0.107	0.047	0.105	0.773
CI_95%	1.234 ± 0.024	1.075 ± 0.008	1.090 ± 0.007	1.493 ± 0.046	0.000	0.000	0.000	0.140	0.000	0.000
HI	0.043 ± 0.002	0.058 ± 0.003	0.065 ± 0.004	0.103 ± 0.008	0.000	0.000	0.000	0.066	0.000	0.002

ISSN: 1748-717X