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dc.contributor.author Neath, Cathy en_US
dc.date.accessioned 2007-06-01T19:24:33Z
dc.date.available 2007-06-01T19:24:33Z
dc.date.issued 2000-08-01T00:00:00Z en_US
dc.identifier.uri http://hdl.handle.net/1993/2420
dc.description.abstract The accuracy of treatment planning system's (TPS) external photon beam dose calculations for complex fields involving the use of blocks, multi-leaf collimator (MLC), virtual wedges and asymmetric jaws are evaluated in this study. The treatment planning systems investigated were: (1) Helax-TMS (Version 4.1) which implements an energy fluence based model of the treatment head of a linac, and pencil beam algorithm for determination of the dose in the patient; and (2) CMS FOCUS (Version 2.5) which employs the Clarkson's algorithm and a scatter phantom ratio model to calculate the dose. Measured output factors (OF) and head scatter factors (HSF) for several square fields, fields formed by independent jaws, MLC formed fields and blocked fields were determined and compared with OFs and HSFs predicted by the TPSs. OR for virtual wedges, formed by independent jaws, were also measured and compared with those predicted by CMS and TMS. In addition, a method of independent verification of the monitor unit calculations of TMS was developed. (Abstract shortened by UMI.) en_US
dc.format.extent 7978470 bytes
dc.format.extent 184 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language en en_US
dc.language.iso en_US
dc.title Dosimetric evaluation and verification of treatment planning systems en_US
dc.degree.discipline Physics & Astronomy en_US
dc.degree.level Master of Science (M.Sc.) en_US


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