Several dosimetric parameters were measured for three very small radiation fields (1.5, 3, and 5 mm diameter at the machine isocenter) with a small ionization chamber and a new type of radiochromic film. The experiments were carried out on a Clinac-18 linac and the fields were shaped by specially manufactured collimators. When measuring dose profiles, the ionization chamber measurements were first corrected for response variation in off-axis direction, and then deconvolved to eliminate the blur due to the poor resolution of the chamber. The measured data agreed with Monte Carlo simulations within the established statistical uncertainties. / Dynamic stereotactic radiosurgery was carried out on the same accelerator using the very small radiation beams. The dose distributions and their displacements from the laser-defined isocenter of the linac were measured and then compared to 3-D Monte Carlo calculations. The results proved that dynamic radiosurgery with very small beams has potential for clinical use.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.29463 |
| Date | January 2002 |
| Creators | Paskalev, Kamen A. |
| Contributors | Podgorsak, 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: 001945082, proquestno: MQ85814, Theses scanned by UMI/ProQuest. |
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