Aftermath of an IED Explosion (IMAGE) Harvard University Caption Bioengineers at Harvard have identified the mechanism for diffuse axonal injury and explained why cerebral vasospasm is common after an IED explosion. (NOTE: PI Kit Parker is NOT in this photo.) Credit Photo courtesy of the U.S. Department of Defense. 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.