Photoacoustic Method (IMAGE) University of Missouri-Columbia Caption Viator uses the photoacoustic method, a tabletop device scans a lymph node biopsy with laser pulses. This method could help doctors identify the stage of melanoma with more accuracy. Credit Photo by Pinar Istek Usage Restrictions None 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.