Electron arc therapy is the treatment of choice for tumours involving large curved surfaces. At the Montreal General Hospital a unique approach to the electron arc therapy was developed in 1986 and has been used clinically ever since. The approach is based on the concept of the characteristic angle beta. / We measured radial percentage depth doses in a polystyrene cylindrical phantom irradiated with electron arc beams having angles beta in the range from 5$ sp circ$ to 100$ sp circ,$ for 9 MeV, 12 MeV, 15 MeV, and 18 MeV electron beam energies. We showed that the characteristic angle-$ beta$ concept can be extended to the beams with nominal energy of 18 MeV. The validity of the empirical relationship, relating the doses in two beams with different energies, was confirmed. A linear relationship between the angle $ beta$ and the depth of dose maximum, the depth of the 85% depth dose, and the depth of the 50% depth dose, was established. The surface dose dependence on the angle $ beta$ was also determined and the bremsstrahlung contamination in the electron arc therapy studied.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.24037 |
| Date | January 1996 |
| Creators | Robar, Vlado |
| Contributors | Podgorjak, Ervin B. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Medical Radiation Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001528957, proquestno: MM19847, Theses scanned by UMI/ProQuest. |
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