The analysis of optical flow methods for use with tumor motion
Van Loon, Christopher
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This thesis explores the use of different optical flow techniques with specific focus directed at tracking lung tumor motion for use with IMRT (Intensity Modulated Radiation Therapy). A unique combination of Lucas Kanade and a method proposed by Uras et al. is used which utilizes the strengths of each method (Uras' method is tailored to translational flow, while Lucas Kanade is a more robust method). The algorithm developed (hybrid approach) accurately distinguishes between situations to use Lucas Kanade and Uras' method and shows improvement in experiments generated by our research group. Tests were also performed on public data sets with ground truth flow field information. In these experiments positive results were also found. The novel approach developed here in the combination of Lucas Kanade and Uras' method could be further developed to combine numerous optical flow methods to further improve upon what other researchers have accomplished in their work.