Pig Coronary Artery (IMAGE) Massachusetts General Hospital Caption In this OFDI image of the stented coronary artery of a pig, taken in vivo, the red reflects the inner arterial surface and the stent is represented as blue. The outer layers of the artery, exposed when the vessel was overstressed by an overinflated balloon catheter, appear as grey. Credit Massachusetts General Hospital-Wellman Center for Photomedicine Usage Restrictions none License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.