Tissue phantom (IMAGE) Optica Caption The researchers tested the new technique in tissue phantoms that mimic average brain tissue properties, demonstrating that they could acquire microscopic resolution images at depths of up to 4 millimeters in optically opaque tissues. Credit Daniel Razansky, University of Zurich and ETH Zurich 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.