After patients are diagnosed with breast cancer, they undergo breast magnetic resonance (MR) imaging to determine if the cancer is located in more than one place in the breast. Breast MR imaging is a good option for this test because it has very high sensitivity (catches almost all breast tumors). However, breast MR is slow: it takes about two minutes to acquire one image, and is very low resolution. The points that make up the breast MR image are around 1 to 3 mm in size.