Photoacoustic Images (IMAGE) Optica Caption Photoacoustic/ultrasound images taken with the new system show a human finger joint from different angles. The images on the right (b and d) show anatomical structures revealed by the ultrasound. The images on the left (a and c) show the photoacoutics data overlaying the ultrasound data. The bright yellow and red at the top of the finger show the skin and blood vessels running parallel to the finger. Credit Pim van den Berg/ Khalid Daoudi Usage Restrictions Include caption & 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.