Biomedical engineers designed software that allows heart surgeons to perform a virtual surgery before entering the operating room. The tool allows the surgeon to see the predicted outcomes of different surgical approaches, and help determine which would be the best for the patient. The tool uses MRI images of the heart at different times in the cardiac cycle to model the cardiovascular anatomy, blood flow and heart rate. Based on what this 3D model reveals, surgeons can see what needs to be corrected and attempt multiple different procedures using the tool. An analysis of the heart's fluid dynamics describes how well blood flows after the virtual procedure.