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Comparison Of 3d And 4d Cbct For The Localization Of Moving Targets, Runyon Colie Woods
Comparison Of 3d And 4d Cbct For The Localization Of Moving Targets, Runyon Colie Woods
LSU Master's Theses
Purpose: Compare the localization accuracy of 3D cone beam computed tomography (CBCT) and 4D CBCT for a dynamic respiratory phantom, considering cases with and without respiratory variations between planning and treatment. Methods and Materials: A respiratory phantom was imaged using 3D CBCT and 4D CBCT. Measurements of the amplitude of motion in 3D CBCT and 4D CBCT and size of the sphere at its exhale position in 4D CBCT were acquired. The phantom was then misaligned by known distances relative to a reference position. 3D CBCT and 4D CBCT were used to re-align the phantom by comparing localization images to …