Photoacoustic imaging system in use (VIDEO) Optica This video is under embargo. Please login to access this video. Caption The wearable device offers a non-invasive way to study or detect blood flow changes that are associated with various diseases or activities. Credit Lei Xi, Southern University of Science and Technology Usage Restrictions None License Original 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.