Table 2.
Measured volumes in the humanoid breast phantom. The volumes were contoured by predetermined automatic threshold values depending on the different scanning positions in the CT bore. PTV, planning target volume.
| Lung | Heart | Body | Breast PTV | |||||
|---|---|---|---|---|---|---|---|---|
| Volume (cm3) | difference (%) | Volume (cm3) | difference (%) | Volume (cm3) | difference (%) | Volume (cm3) | difference (%) | |
| Center | 462.6 | 0.0 | 164.1 | 0.0 | 1908.2 | 0.0 | 140.8 | 0.0 |
| Off-15 cm | 464.2 | 0.3 | 163.9 | −0.1 | 1903.7 | −0.2 | 140.1 | 0.5 |
| Off-20 cm | 469.4 | 1.5 | 163.6 | −0.1 | 1933.6 | 1.3 | 139.7 | 0.8 |
| Off-25 cm | 414.5 | −10.3 | 163.2 | −0.5 | 1805.0 | −5.4 | 136.4 | 3.1 |
| Off-30 cm | 520.5 | 12.5 | 162.4 | −1.0 | 1917.0 | 0.5 | 122.8 | 12.8 |