Title page for ETD etd-0218103-102118


Type of Document Master's Thesis
Author Ferachi, Kara King
URN etd-0218103-102118
Title Multileaf Collimator Positional Reproducibility Evaluated with a Two-Dimensional Diode Array
Degree Master of Science (M.S.)
Department Physics and Astronomy
Advisory Committee
Advisor Name Title
Thomas Kirby Committee Chair
Mark Williams Committee Member
Oscar Hidalgo-Salvatierra Committee Member
Sheldon Johnson Committee Member
Keywords
  • multileaf collimator
  • diode array
Date of Defense 2003-02-06
Availability unrestricted
Abstract
When delivering the total dose via a sequence of small fields shaped by a multileaf collimator, it is important to consider leaf positional reproducibility. A small error in the leaf position can result in large dose errors to the entire field. This is true for both dynamic multileaf collimation and step and shoot delivery. The goal of this research project is to design a method of quality assurance that is easily reproducible, sensitive to small changes in leaf position, and requires minimal time on the part of the medical physicist to carry out. This paper describes a system of measurements performed with a two-dimensional diode array that can be used in conjunction with a leaf edge function determined from radiographic film to quickly and easily test the reproducibility of the multileaf collimator position with acceptable sensitivity.
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