Video Description: Dr. Roberto Lang, professor of medicine and director of the Noninvasive Cardiac Imaging Lab at the University of Chicago Medical Center, discusses 3D echocardiography, the latest technology for observing the heart in motion. Lang discusses how 3D Echo is used to diagnose heart disease, prepare for heart surgery and to guide surgeons during some procedures. Look over Dr. Lang's shoulder as he uses 3D Echo to examine the structure and function of a patient's heart.