Table 2.

Comparison of two strategies by various parameters

Variable	Non-coplanar intensity-modulated radiotherapy plan	Stereotactic body radiotherapy plan	p-value
Clinical target volume (ml)	9.99 (range, 1.16–42.82)
PTV volume (ml)	34.84 (range, 6.59–88.85)
PTV coverage (%)
V100%	86.9 ± 12.0	86.7 ± 15.5	0.59
V95%	98.9 ± 2.8	99.3 ± 0.9	0.20
V90%	99.7 ± 0.9	99.9 ± 0.2	0.34
Radiation Therapy Oncology Group CI	1.05 ± 0.21	1.47 ± 0.21	<0.001
Healthy tissue CI	0.84 ± 0.09	0.63 ± 0.14	<0.001
CN
CN 100	0.72 ± 0.10	0.53 ± 0.13	<0.001
CN 75	0.33 ± 0.08	0.27 ± 0.06	<0.001
CN 50	0.18 ± 0.04	0.15 ± 0.04	<0.001
Homogeneity index	1.04 ± 0.03	1.11 ± 0.03	<0.001

CI, conformity index; CN, conformal number; PTV, planning target volume; V_x%, the volume receiving ≥x% of the prescribed dose.

Parameters are calculated by Wilcoxon signed-rank sum test.