We are a clinical research unit of the Robarts Research Institute. Our primary mission is stroke prevention. Atherosclerosis is the underlying process that causes most heart attacks and strokes. We have developed a way to measure atherosclerosis by measuring the "Total Plaque Area" (TPA) in arteries using 2-D and 3-D ultrasound. Our ability to measure TPA enables us to measure the change in TPA over time and enables us to focus our clinical research in 3 specific areas.