1.3.Preoperative breast MRI The standard breast MRI protocol includes T2 sequences (anatomy and signal analysis), T1 gradient-echo sequences and injected dynamic 3D sequences (gadolinium-containing contrast agent). Patients are placed on the prone position, arms above the head, with both breasts hanging in the coil loops. MRI data are collected from the computer server of radiology department, anonymized with the subject identification code and then burned to CD. Digital Imaging and Communication in Medicine (DICOM) data are converted into MHD format.