Purdue chemotherapy light technology (IMAGE) Purdue University Caption This image shows time-frequency biomarker masks. The numerical values are the z-factors for each biomarker. Credit David Nolte/Purdue University 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.