Table 4.
Time effort evaluation of craniospinal axis irradiation for ten patients treated using the Hi-ART tomotherapy system. The last line indicates mean values over the ten 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Leukemia | 788.4 | 49.3 | 16 | 11260 | 71 | 0.9 | 3.0 | 5 | 0.287 | 16 |
| Astrocytoma | 695.9 | 35.7 | 19.5 | 9918 | 77 | 1.11 | 2.0 | 5 | 0.43 | 20 |
| Ependymoma | 774.1 | 51.6 | 15 | 11050 | 74.4 | 0.96 | 2.5 | 5 | 0.287 | 20 |
| Medulloblastoma | 1118.6 | 79.9 | 14 | 16036 | 79.9 | 0.71 | 1.8 | 2.5 | 0.4 | 22 |
| Medulloblastoma | 933.4 | 59.5 | 15.7 | 13356 | 85.7 | 0.92 | 2.4 | 5 | 0.287 | 20 |
| Leptomeningeal spread | 771.8 | 60.3 | 12.8 | 11020 | 86.9 | 1.12 | 2.2 | 5 | 0.287 | 20 |
| Leptomeningeal spread | 1023.8 | 53.9 | 19 | 14665 | 77.6 | 0.76 | 2.9. | 5 | 0.287 | 24 |
| Mesencephalic germinoma | 1620.9 | 108.1 | 15 | 23300 | 77.5 | 0.48 | 2.7 | 2.5 | 0.287 | 15 |
| Multiple metastases of the central nervous system | 736 | 26.8 | 27.5 | 10500 | 57.8 | 0.78 | 2.5. | 5 | 0.43 | 20 |
| Multiple metastases of the central nervous system | 696.2 | 43.5 | 16 | 9907 | 74.3 | 1.07 | 2.1 | 5 | 0.34 | 20 |
| Mean value (Median value for field width) | 915.9 | 56.9 | 17.1 | 13101.2 | 76.2 | 0.88 | 2.4 | 45 | 0.33 | 20 |