Abstract
Kilovoltage Cone Beam CT (kV CBCT) based image guided radiotherapy (IGRT) is an important approach to correct patient setup which can generate 3D patient anatomy image in radiotherapy process. This paper discusses multi degrees of freedom patient positioning using CBCT based IGRT and presents a new coordinate system classification method. We can conclude that it is essential for correct patient setup to overlap three key points, namely the center of mass (CM) of tumor target, the origin of treatment planning CT image coordinate system, the origin of CBCT image coordinate system). In addition, this paper gives the implementing method of overlapping these three points.
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