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Table 3 Conformality and V20 constraints, as per the RTOG 0813 protocol [16]

From: Assessment of precision irradiation in early non-small cell lung cancer and interstitial lung disease (ASPIRE-ILD): study protocol for a phase II trial

PTV Volume (cc) Ratio of prescription isodose volume to the PTV bolume (R100) Ratio of 50% prescription isodose volume to the PTV volume, (R50) Maximum dose (in % of dose prescribed) @ 2 cm from PTV in any direction, (D2cm) (Gy) Percent of Lung receiving 20 Gy total or more (V20)
Deviation Deviation Deviation Deviation
None Minor None Minor None Minor None Minor
1.8 < 1.2 < 1.5 < 5.9 < 7.5 < 50.0 < 57.0 < 10 < 15
3.8 < 1.2 < 1.5 < 5.5 < 6.5 < 50.0 < 57.0 < 10 < 15
7.4 < 1.2 < 1.5 < 5.1 < 6.0 < 50.0 < 58.0 < 10 < 15
13.2 < 1.2 < 1.5 < 4.7 < 5.8 < 50.0 < 58.0 < 10 < 15
22.0 < 1.2 < 1.5 < 4.5 < 5.5 < 54.0 < 63.0 < 10 < 15
34.0 < 1.2 < 1.5 < 4.3 < 5.3 < 58.0 < 68.0 < 10 < 15
50.0 < 1.2 < 1.5 < 4.0 < 5.0 < 62.0 < 77.0 < 10 < 15
70.0 < 1.2 < 1.5 < 3.5 < 4.8 < 66.0 < 86.0 < 10 < 15
95.0 < 1.2 < 1.5 < 3.3 < 4.4 < 70.0 < 89.0 < 10 < 15
126.0 < 1.2 < 1.5 < 3.1 < 4.0 < 73.0 > 91.0 < 10 < 15
163.0 < 1.2 < 1.5 < 2.9 < 3.7 < 77.0 > 94.0 < 10 < 15