. Author manuscript; available in PMC: 2012 Dec 1.

Published in final edited form as: Radiother Oncol. 2011 Jun 12;101(3):376–382. doi: 10.1016/j.radonc.2011.05.028

Table 2.

Comparison^† of the Mean Dose to Target Volumes and Conformity Index^* for IMRT, Adaptive IMRT, IMPT, and Adaptive IMPT

	Volume of PTV Receiving 100% of the Prescribed Dose			Conformity Index
	PTV₅₀	PTV₆₄	PTV₇₀	PTV₅₀	PTV₆₄	PTV₇₀
IMRT	99.9% (±0.2%)	99.1% (±0.3%)	98.6% (±0.7%)	1.97 (±0.48)	1.59 (±0.28)	1.49 (±0.26)
Adaptive IMRT	99.8% (±0.4%)	99.0% (±0.5%)	99.0% (±0.8%)	2.06 (±0.56)	1.53 (±0.39)	1.75 (±0.69)
IMPT	99.9% (±0.1%)	99.5% (±0.5%)	99.0% (±0.7%)	1.52 (±0.31)	1.30 (±0.18)	1.23 (±0.11)
Adaptive IMPT	99.9% (±0.1%)	99.5% (±0.5%)	99.4% (±0.7%)	1.64 (±0.38)	1.40 (±0.19)	1.54 (±0.46)

^†

Values listed for PTV volumes and conformity indexes are the mean values for the study population. The standard deviations for each comparison are listed in brackets.

Conformity index was calculated as the ratio of the reference isodose volume to the volume of each planning target volume being assessed, with the 95% isodose line of each PTV selected as the reference isodose volume in accordance with ICRU 50 guidelines.