Photoacoustic Ultrasound Dental Image (IMAGE) University of California - San Diego Caption Photoacoustic/ultrasound image after squid ink oral rinse treatment. Ultrasound image of the teeth is in black and white. The photoacoustic signal from the squid ink contrast agent in the pocket depth is in red and signals from stains on the teeth are in blue. Credit Jokerst Bioimaging Lab at UC San Diego Usage Restrictions Please credit: Jokerst Bioimaging Lab at UC San Diego 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.