Table 2.
6 MV TBI lung dose results showing 6 MV bilateral vs. AP–PA TBI results for lung dose, listed in order of increasing bilateral thorax separation. All ratios calculated from plans with TDC on, except the lung dose correction factors (CF). CF values represent the ratio of mean lung dose from fixed MU calculated with tissue density correction divided by the same lung dose parameter calculated without tissue density correction. Ratio of bilateral and AP–PA correction factors (column 6) is calculated for mean lung dose
| # of Patients | Bilat. Thorax Separation (cm) | Max Lung Dose Bilat./AP Ratio | Mean Lung Dose Bilat./AP Ratio | Mean Lung Dose Bilat. CF | Bilat./AP CF Ratio |
|---|---|---|---|---|---|
| 2 | 28 | 1.08 | 1.00 | 1.08 | 1.08 |
| 1 | 32 | 1.04 | 0.93 | 1.07 | 1.00 |
| 1 | 40 | 1.10 | 1.01 | 1.11 | 1.06 |
| 2 | 41 | 1.19 | 1.05 | 1.13 | 1.07 |
| 3 | 42 | 1.06 | 0.96 | 1.13 | 1.10 |
| 2 | 43 | 1.21 | 1.04 | 1.17 | 1.09 |
| 1 | 44 | 1.13 | 0.97 | 1.05 | 0.99 |
| 2 | 46 | 1.18 | 0.97 | 1.15 | 1.09 |
| 1 | 47 | 1.28 | 1.04 | 1.07 | 1.01 |
| 2 | 48 | 1.07 | 0.92 | 1.12 | 1.09 |
| 3 | 49 | 1.09 | 0.94 | 1.07 | 1.01 |
| 1 | 52 | 1.07 | 0.97 | 1.13 | 1.06 |
| 1 | 53 | 1.06 | 0.87 | 1.10 | 1.04 |
| 1 | 58 | 1.13 | 0.87 | 1.14 | 1.08 |
| 1 | 63 | 1.05 | 0.87 | 1.10 | 1.02 |
| Mean | 1.12 | 0.96 | 1.11 | 1.05 | |
| SD | 0.07 | 0.06 | 0.03 | 0.04 |