The amount of radiation given during computed tomography (CT) as part of whole-body positron emission tomography (PET)/CT exams can be safely reduced without comprising the quality of the images taken, a new study indicated. According to the study published in the American Journal of Roentgenology, Elena Tonkopi, of Dalhousie University, Canada, and colleagues were able to reduce the mean effective CT radiation dose by more than 2.5 mSv, from 8.1 mSv to 5.5 mSv, while maintaining image quality.