Master of Science (MS)
Physics and Astronomy
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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Release the entire work immediately for access worldwide.
Ferachi, Kara King, "Multileaf collimator positional reproducibility evaluated with a two-dimensional diode array" (2003). LSU Master's Theses. 2857.