Contents

Abstract
Acknowledgments
Contents
List of Tables
List of Figures
List of Abbreviations
1 Introduction
1.1 Stereotactic Radiosurgery
2 Literature Survey
3 Methods and Materials
3.1 Electronic Portal Imaging Devices
3.2 Gafchromic RTQA Film
3.3 Isocenter Phantoms
3.3.1 Mechanical and Radiation Isocenter Phantom
3.3.2 Radiation and Localized Isocenter Phantom
3.4 Isocenter Tests
3.4.1 Attachment of Micro-MLC Gantry Attachment
3.4.2 Mechanical and Radiation Isocenter Coincidence Test
3.5 Camera System Test
3.5.1 Initial Camera System Localization Test
3.5.2 DynaTrac Camera System Calibration
3.5.3 Post DynaTrac Camera Calibration
3.6 Backup Jaw Settings Test
3.6.1 GafChromic Film
3.7 Analysis of Film using RIT and OriginPro7
3.7.1 RIT Dose Calibration
3.7.2 Analysis of GafChromic and EPID lms
4 Results
4.1 Initial Verication of Isocenter Position
4.2 DynaTrac Localization Test
4.2.1 Initial Isocenter Localization Test
4.2.2 Post-Camera Calibration Localization Test
4.3 Backup Jaw Settings Test
5 Conclusions
References
A. Example of isocenter position calculation.
B. Daily/Patient Specific Isocenter QA Instructions
C. Monthly Isocenter QA Instructions
D. Annual Isocenter QA Instructions
E. DynaTrac Camera System Calibration