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Tumor rotation calculation method. First, the tumor volume is delineated at exhale (phase 1) and inhale (phase 5) on RG PET images. Second, the center of mass of each volume is calculated. The long axis length (longest diameter) through the center of mass of the tumor is calculated. Then, the angle between the long axis length and the XY plane is calculated. This angle is compared between the exhale (phase 1) and inhale (phase 2) to determine the pseudotumor rotation.
