Table 2.
Summary of daily volumetric and positional data
| Variable | Value, median (range) | Mean ± Stdev |
|---|---|---|
| Contour volumes [cc] | ||
| Breast PTV Vol | 1095.20 (654.20–1343.70) | 1040.21 ± 218.26 |
| Breast PTV Eval Vol | 899.90 (540.70–1149.80) | 852.00 ± 196.96 |
| Daily couch shift [cm] | ||
| LAT | 0.07 (− 2.26 to 2.28) | 0.05 ± 0.92 |
| LNG | − 0.13 (− 2.10 to 1.35) | − 0.12 ± 0.70 |
| VRT | − 0.14 (− 2.20 to 1.93) | − 0.13 ± 0.63 |
| MAG | 1.08 (0.27–2.78) | 1.19 ± 0.57 |
| PTV Eval residual shift [cm] | ||
| LAT | − 0.04 (− 0.35 to 0.32) | − 0.03 ± 0.12 |
| LNG | 0.07 (− 0.38 to 0.47) | 0.05 ± 0.19 |
| VRT | 0.06 (− 0.32 to 0.43) | 0.05 ± 0.13 |
| MAG | 0.25 (0.05–0.49) | 0.26 ± 0.10 |
| BODY V95% residual shift [cm] | ||
| LAT | − 0.01 (− 0.60 to 0.46) | − 0.03 ± 0.22 |
| LNG | − 0.04 (− 0.53 to 0.66) | − 0.04 ± 0.18 |
| VRT | 0.05 (− 0.58 to 0.43) | 0.03 ± 0.16 |
| MAG | 0.27 (0.04–0.80) | 0.30 ± 0.15 |
| Daily SSD [cm] | ||
| Lateral beam | 85.45 (80.80–95.70) | 86.24 ± 3.91 |
| Medial beam | 102.75 (94.70–104.80) | 102.00 ± 2.82 |
| Lateral beam deviation from planned | 0.10 (− 2.10 to 1.30) | 0.08 ± 0.58 |
| Medial beam deviation from planned | 0.10 (− 0.50 to 1.30) | 0.18 ± 0.42 |
| Target contour DSC | ||
| Breast PTV Eval | 0.93 (0.88–0.97) | 0.93 ± 0.02 |
| BODY V95% | 0.92 (0.88–0.96) | 0.92 ± 0.02 |
| Patient weight [%] | ||
| Deviation from planned/simulation | − 0.48 (− 6.50 to 4.71) | − 0.64 ± 2.69 |
cc, centimeter cubed (cm3); PTV Eval, planning treatment volume for evaluation; LAT, lateral; VRT, vertical; LNG, longitudinal; MAG, magnitude; SSD, source-to-surface distance; DSC, dice similarity coefficient; Stdev, standard deviation