Two MRI Images of An Onion (IMAGE) Boston University Caption Two MRI images of an onion: the image on the right shows enhancement produced by an intelligent metamaterial developed by Xin Zhang and colleagues. Image courtesy of Zhang et al. Credit Image courtesy of Zhang et al. Usage Restrictions Must provide proper credit. 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.