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Title: Accuracy in radiotherapy dosimetry
Author: Allahverdi, Mahmoud
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1998
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The project involves an experimental analysis of achievable accuracy in the different steps of radiotherapy, including investigations of the basic dosimetry chain, considering the individual steps concerned in dosimeter and treatment beam calibration and some aspects of treatment planning and dose delivery. The results are investigated from these various areas and are analysed in terms of overall achievable accuracy and its relationship to clinical requirements and to quality assurance programmes. It is concluded that required clinical accuracy can be achieved in radiotherapy treatment, but needs careful control at all stages of the radiotherapy process. In addition a previously-designed geometric phantom, developed for a UK national dosimetry intercomparison and audit system has been used to extensively test achievable accuracy of dosimetry and some basic treatment planning parameters and processes in one department. This has been used as the basis to develop an interdepartmental audit in Scottish and other radiotherapy centres (the so-called Scottish+ audit group, within the UK radiotherapy dosimetry audit network). Also a semianatomic phantom has been developed to allow reasonably realistic audit of various representative treatment sites. This has been constructed from epoxy-based tissue substitute phantom materials. It has been extensively tested before audit use, by measuring the whole range of possible irradiation situations on five megavoltage photon beams, calculating dose distributions using the Edinburgh in-house treatment planning system and CADPLAN, and comparing measured results to expected values. Some small differences can be linked to the phantom materials. Others can be linked to small discrepancies in the testing department, for example in planning data, machine performance, etc.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available