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CTDIvol at different off-center positions when an AP or AP-lateral topogram was used for ATCM. When AP scout views were used for ATCM, radiation dose gradually reduce as the table height decreased and far away from x-ray tube. The radiation dose on different off-center position was essentially flat when AP-lateral topogram was used for ATCM. AP = anteroposterior, ATCM = automated tube current modulation, CTDIvol = volume CT dose index.
