Stuart J. Hutchison, MD, FRCPC, FACC , FAHA, Clinical Professor of Medicine, University of Calgary, Departments of Cardiac Sciences, Medicine, and Radiology, Director of Echocardiography, Foothills Medical Center, Calgary, Ontario, Canada Katherine C. Holmes, RVT , RT(R), Team Leader, Vascular Ultrasound Laboratory, Division of Cardiology, St. Michael’s Hospital, Toronto, Ontario, Canada