Measuring Blood Vessel Function (IMAGE) Norwegian University of Science and Technology Caption Researchers measured 'flow-mediated dilation' of blood vessels using ultrasound three hours after study subjects drank beet juice, or the placebo beet juice. Credit Harald Engan, Mid Sweden University Usage Restrictions With proper credit for photographer 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.