Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System

Bibliographic Details
Main Author:	Hancock, George H.
Language:	English
Published:	University of Toledo Health Science Campus / OhioLINK 2013
Subjects:	Physics Radiation
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=mco1364343813

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-mco13643438132021-08-03T05:21:10Z Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System Hancock, George H. Physics Radiation In Stereotactic Radiosurgery, one of the most import factors that must be measured is the accuracy of the localization system, whether it be lasers or camera system; and the coincidence of the localized isocenter to the radiation isocenter. According to TG-142 the minimum deviation between the isocenter determined by the localization device and the radiation isocenter of the machine must be no more that 1 mm. In addition, the minimum deviation, also recommended by TG-142, between the radiation isocenter and the mechanical isocenter of the machine must be no more that 1mm.The purpose of this research was to develop a method that both of these parameters could be measured and add these tests to our patient specific QA, monthly QA, and annual QA procedures. A plastic phantom was constructed with holes drilled in each of the sides to meet at a common point in the middle of the phantom. This common intersection was then set as the isocenter for the treatment beams, and the coordinates of the point were sent to the camera system. Measurements were than taken with both the EPID and GafChromic film with the use of rigid tungsten rods in each hole to mark the position of the holes on the film and EPID. The films were then scanned and the field edges and isocenter positions were determined by taking the coordinates of a point that was halfway between the minimum and maximum points in all cases. 2013-05-20 English text University of Toledo Health Science Campus / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=mco1364343813 http://rave.ohiolink.edu/etdc/view?acc_num=mco1364343813 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection	NDLTD
language	English
sources	NDLTD
topic	Physics Radiation
spellingShingle	Physics Radiation Hancock, George H. Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System
author	Hancock, George H.
author_facet	Hancock, George H.
author_sort	Hancock, George H.
title	Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System
title_short	Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System
title_full	Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System
title_fullStr	Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System
title_full_unstemmed	Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System
title_sort	development of a comprehensive linac-based quality assurance program for a retrofitted micro-mlc srs system
publisher	University of Toledo Health Science Campus / OhioLINK
publishDate	2013
url	http://rave.ohiolink.edu/etdc/view?acc_num=mco1364343813
work_keys_str_mv	AT hancockgeorgeh developmentofacomprehensivelinacbasedqualityassuranceprogramforaretrofittedmicromlcsrssystem
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Development of a Comprehensive Linac-based Quality Assurance Program for a Retrofitted Micro-MLC SRS System

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