NPL Point Spread Phantom (IMAGE) National Physical Laboratory Caption NPL's point spread phantom allows Optical Coherence Tomography instrument manufacturers to align the optical pathways in their machines. This allows them to optimize their performance and ensure that the systems will operate within specification once they are deployed in the field. Credit Dr Pete Tomlins, NPL 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.