Heart diseases kill 17.9 million people each year, according to the World Health Organization (WHO), and this is just an estimate; the actual number might be a lot higher. The Centers for Disease Control and Prevention (CDC) presents a similarly grim picture, saying that in the U.S., one person dies of a cardiovascular issues every 37 seconds. Still, all those who suffer from such issues don’t die immediately, if the condition is diagnosed and treated early. For this, the doctor needs to know what is going on in the heart and blood vessels, for which they require vascular imaging systems.