Ultrasound Image of the Carotid Artery (IMAGE) The Physiological Society Caption Lines in yellow were used to determine arterial diameter and stretching before and following exercise. Credit Craig Williams Usage Restrictions with 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.