New NIST Standard Reference Material to Help Calibrate Hospital CAT Scanners (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption Standard Reference Material 2088 makes it possible to link CAT scans to the International System of Units for the first time. The SRM -- a collection of five blocks of polyurethane foam of different densities, shown here in front of its delivery case -- allows scans to be tied to measurement units important for diagnosing lung disease. Credit Boutin/NIST Usage Restrictions None Share Print E-Mail 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.