Patient (IMAGE) Orlando Health Caption Dewey Caldwell wears a vest designed to precisely map the heart in preparation for an experimental therapy that uses targeted radiation therapy as an alternative to a heart ablation procedure, which is often too invasive for patients with advanced heart disease. Credit Orlando Health Usage Restrictions All multimedia is available for free and unrestricted media use with courtesy to Orlando Health. 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.