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
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 |