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Table 1 Statistics for all lung SBRT plans included in this study. n is the number of plans in the volume bin. Conformity index is the quotient of the volume receiving the prescribed dose and the PTV volume. Prescription (Rx) Dose is the prescribed dose normalized such that V100 ≥ 95%. IMRT factor is the quotient of total monitor units and fractional dose in cGy

From: Lung Stereotactic Body Radiation Therapy (SBRT) dose gradient and PTV volume: a retrospective multi-center analysis

Volume bin (cm3) n PTV Volume (cm3) Gradient Measure (cm) R50% Conformity Index Rx Dose (cGy) Fractions IMRT factor
1.8–3.8 7 3.05 0.84 8.59 1.09 3871 3.6 3.7
3.8–7.4 46 5.72 0.86 5.99 1.09 4626 3.5 3.2
7.4–13.2 87 9.93 0.94 5.14 1.05 4726 4.0 3.1
13.2–22 81 17.55 1.06 4.73 1.03 4808 4.4 3.0
22–34 48 26.53 1.14 4.30 1.01 4884 4.3 2.8
34–50 49 41.11 1.28 4.07 1.00 4814 4.5 2.9
50–70 29 58.35 1.33 3.75 1.00 4855 4.7 2.8
70–95 9 81.93 1.45 3.62 0.99 4250 4.4 3.2
95–126 8 108.08 1.65 3.72 0.98 4562 5.0 2.6
126–163 7 143.05 1.88 4.07 0.99 4686 4.9 2.5
>  163 3 235.67 2.12 3.61 1.01 4267 4.7 3.0