MRI sensor (IMAGE) University of Copenhagen - Faculty of Science Caption The MRI sensor or magnetometer uses laserlight and gas to measure magnetic fields. Photo: University of Copenhagen Credit Photo: Kristian Bjorn-Hansen, University of Copenhagen Usage Restrictions Used within context of research and with proper credit License Original 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.