According to American Heart Association more than 1.2 million patients in the U.S. go through cardiac angiograms every year and out of which 1 to 2% of cases results in complications and nearly 25 people die every year with this process. A new study published in the New England Journal of Medicine (NEJM) however has revealed that noninvasive CT scans are almost as precise at imaging coronary artery blockages as against traditional angiography and are much safer for the patients.