Purpose: A standard CBCT image lacks localization accuracy in the complex registration of a moving target. The 4D Cone Beam Computed Tomography (4D CBCT) is a useful tool for treating moveable tumors because it allows us to precisely pinpoint the location of the tumors during treatment and provide a guide during adaptive treatment strategy. This study evaluates the accuracy of 4D CBCT over a wide range of target motion scenarios.
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