Table 1.
Basic parameters used in the course of dose distribution planning for helical tomotherapy and conventional medical linear accelerator, for the following: 1 – anaplastic medulloblastoma, 2 – multifocal metastases to brain, 3 – vulva cancer, 4 – tongue cancer, 5 – metastases to bones, 6 – advanced skin cancer
| No of case | Helical tomotherapy (HT) | Conventional linear accelerator (CLA)* | ||||||
|---|---|---|---|---|---|---|---|---|
| 1 | 1 phase | 2 phase | 3 phase | 1 phase | 2 phase | 3 phase | ||
| FW: | 5 | 2.5 | 2.5 | Method: | 3 iso, 3DCRTc | 2 iso, 3DCRTc | 1 iso, 3DCRTc | |
| Pitch: | 0.287 | 0.287 | 0.287 | TNF: | 17 | 8 | 2 | |
| MF: | 2.1 | 2.2 | 2.3 | Energy: | 6 MV | 6 MV | 6 MV | |
| 2 | Simultaneus integrated boost | |||||||
| FW: | 2.5 | Method: | 1 isocentre, IMRT, noncoplanar | |||||
| Pitch: | 0.215 | TNF: | 13 | |||||
| MF: | 5.0 | Energy: | 6 MV | |||||
| 3 | FW: | 2.5 | Method: | 1 isocentre, IMRT, coplanar | ||||
| Pitch: | 0.287 | TNF: | 9 | |||||
| MF: | 2.4 | Energy: | 6 MV and 20 MV | |||||
| 4 | Simultaneus integrated boost | |||||||
| FW: | 2.5 | Method: | 1 isocentre, IMRT, noncoplanar | |||||
| Pitch: | 0.287 | TNF: | 7 | |||||
| MF: | 3.0 | Energy: | 6 MV | |||||
| 5 | FW: | 2.5 | Method: | 3 isocentres, IMRT, coplanar | ||||
| Pitch: | 0.215 | TNF: | 16 | |||||
| MF: | 2.7 | Energy: | 20 MV | |||||
| 6 | FW: | 1 | Method: | 1 isocentre, IMRT, noncoplanar | ||||
| Pitch: | 0.215 | TNF: | 6 | |||||
| MF: | 1.8 | Energy: | 6 MV | |||||
Dose normalization: median PTV volume for each cases receives at least 100% of the prescribed dose
FW – field width in cm
MF – modulation factor
TNF – total number of fields
IMRT – intensity modulated radiotherapy
3DCRT – three dimensional conformal radiotherapy realized by coplanar fields
*
for each case IMRT realized by sliding window technique using 120 multileaf collimator