Radiosurgery is a radiation treatment modality in which a high radiation dose (few 1000 cGy) is given to a small volume (few cm$ sp3$) within the patient's brain during a single treatment. The main physical characteristics of radiosurgery are narrow circular radiation beams, stringent requirements on the numerical ($ pm$2%) and spatial ($ pm$1 mm) accuracy of dose delivery to the target and the need for sharp dose fall-offs outside the target volume. / Physical aspects of radiosurgery based on isocentric linear accelerators (linacs) are presented. The equipment and techniques used in the measurement of various radiosurgical beam parameters are discussed. Also discussed is the accuracy of radiation beam delivery to the target, the calculation and measurement of 3-dimensional isodose distributions obtained from circular beams, and the production of cylindrical dose distributions with rectangular beams. It is shown from the physics point-of-view that linac-based radiosurgery is a viable alternative to radiosurgery with the commercially available Gamma unit.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.59890 |
| Date | January 1990 |
| Creators | Sixel, Katharina E. (Katharina Elisabeth) |
| 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 Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001170412, proquestno: AAIMM66542, Theses scanned by UMI/ProQuest. |
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