Breast cancer is one of the common malignant tumors in women. To reduce the recurrence rate and mortality of breast cancer, National Taiwan University Hospital USE magnetic resonance and positron emission tomography (MR-PET) to examine breast cancer patients, using the magnetic resonance and positron synchronization scanner introduced in 2014. Not only is it reduced to three-thirds or less of the original PET-CT dose. In the inspection of medical images, safety and accuracy have also been greatly improved.