Mason (IMAGE) UT Southwestern Medical Center Caption Scientists led by radiologist Dr. Ralph Mason and including research assistant Ana Gondim are among the first to show in mice that a technique called bioluminescence imaging (BLI) can be used to determine the effectiveness of cancer drugs that choke off a tumor’s blood supply. Credit UT Southwestern Medical Center Usage Restrictions Please use our credit line. 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.