Table 1.
Effect of motion on tumor target dose distribution in fifteen patients
| Constraints | Difference between 3D planned dose and cumulative 4D doses Mean (min, max) | 4D inter-fraction variation Mean (min, max) | Difference between cumulative 4D doses with and without motion Mean (min, max) |
|---|---|---|---|
| PTV V90% | −0.48% (−1.44%, 0.25%) | 0.20% (0.00%,1.89%) | −0.35% (−1.22%, 0.83%) |
| PTV V95% | −0.10% (−1.22%, 1.31%) | 0.12% (0.00%, 1.38%) | −0.26% (−1.06%, 1.97%) |
| PTV V105% | −5.04% (−13.88%, 9.71%) | 1.66% (0.00%, 6.87%) | 2.75% (−5.90%, 4.65%) |
| V_Presp. Iso./V_PTV | −0.15 (−0.31, −0.01) | 0.04 (0.00,0.15) | −0.30 (−0.91, −0.01) |
| V_50% Pres. Iso./V_PTV | −0.14 (−0.68, 0.06) | 0.05 (0.00, 0.24) | −0.32 (−1.63, 0.00) |
| D2cm | −0.22 Gy (−2.20 Gy, 1.70 Gy) | 0.45 Gy (0 Gy, 1.20 Gy) | −1.14 Gy (−4.00 Gy, 0.10 Gy) |
The mean values are cumulative dose differences averaged over all patients. The mean values of the 4D inter-fraction variation are the average of the largest variations among four fractions over all patients.