Volumetric Modulated Arc Therapy for Spine Radiosurgery: Superior Treatment Planning and Delivery Compared to Static Beam Intensity Modulated Radiotherapy

Table 1

Dose volume histogram (DVH) values, homogeneity index (HI), and conformity indexes (CI and DSC) values.

Plan	Value							HI	1 − CI98	1 − DSC
Mean (STD)	IMRT	13.54; (0.9)	14.65; (0.5)	16.92; (1.2)	16.02; (0.3)	18.56; (0.8)	7.65; (1.6)	0.21; (0.1)	0.38; (0.4)	0.42; (0.2)
	RA	14.74; (0.9)	15.73; (0.5)	18.09; (0.7)	17.36; (0.5)	18.79; (0.8)	10.88; (2)	0.19; (0.1)	0.31; (0.3)	0.23; (0.1)

The optimal conformity index value is one but may be above or below this value. We calculated and show the absolute value of the mean differences between the CI/DSC and 1.