Table 5.
Time effort evaluation of craniospinal axis irradiation for ten patients treated using the Radixact tomotherapy system. The last line indicates mean values over the three treatment cases. MU stands for monitor units. MF stands for modulation factor.
| Diagnosis | Irradiation time [s] | Number of gantry rotations | Gantry period [s] | Expected MU | Couch travel [cm] | Couch speed [mm/s] | MF | Field Width [cm] | Pitch | fractions |
|---|---|---|---|---|---|---|---|---|---|---|
| Medulloblastoma | 747.8 | 37.4 | 20 | 12850.4 | 81.7 | 1.1 | 2.9 | 5 | 0.433 | 22 |
| Medulloblastoma | 527.4 | 34.5 | 15.3 | 9062.5 | 77.6 | 1.5 | 2.1. | 5 | 0.446 | 20 |
| Ependymoma | 633.3 | 37.8 | 16.7 | 10881 | 85.1 | 1.3 | 2.0. | 5 | 0.445 | 20 |
| Mean values (Median value for field width) | 636.2 | 36.6 | 17.3 | 10931.3 | 81.5 | 1.3 | 2.3 | 5 | 0.441 | 21 |