Table 3.

Planning target volume coverage based on distance from spinal cord

Distance from cord		<1 mm	1-2 mm	2-3 mm
PTV_High	Dmin [%]	54.4 ± 1.5	64.8 ±1.6*	74.8 ± 2.2*
	D90% [%]	96.3 ±1.0	98.8 ± 5.6*	100.4 ± 0.5*
	D80% [%]	101.3 ±7.5	102.4 ± 3.2	103.2 ± 0.3*
PTV_Low	Dmin [%]	57.0 ± 0.9	72.6 ± 1.7*	77.9 ± 3.9*
	D90% [%]	102.3 ± 0.4	103.2 ± 4.8	104.4 ± 0.7*
	D80% [%]	106.7 ± 0.3	106.8 ± 0.5	109.2 ± 1.6

Abbreviations: D80% = minimum dose delivered to 80% of the PTV; D90% = minimum dose delivered to 90% of the PTV; Dmin = minimum dose received by the PTV; PTV_high = high-risk planning-target volume; PTV_low = low-risk planning target volume.

^⁎Statistically significant differences between the mean of either the 1 to 2 mm or 2 to 3 mm group and the mean of the <1 mm.