We are requesting one year's support to retain a post-doctoral research fellow under the American Recovery and Reinvestment Act (ARRA) Administrative Supplement to parent grant R01-EB002834. This capable young scientist has served one year in the Principal Investigator's laboratory and has already made important contributions to the goals of the parent grant. However, he is on a limited appointment, and without this supplement he cannot be retained to help accelerate achievement of the final year goals of the parent grant. The post-doctoral student requested is Dr. David Kwartowitz, a recent Ph.D. graduate from the Biomedical Engineering program at Vanderbilt University. In his current first year he has designed an architecture for and initiated introduction of robotics control and respiratory monitoring into the advanced image guided ablation system designed and developed by the parent grant. His continued training and experience in the lab of the mentor, if this supplement is awarded, will include three important aims associated with the parent grant. The first is to further develop and validate a robust respiratory tracking system needed to correct for respiratory motion, and integrate it into the system. Second, he will investigate and integrate into the system a special robotic device which will adapt to the ablation catheter for stable and precise navigation and targeting during ablative procedures. Third, he will design, develop and validate a method for quantitative assessment of ablative burn patters produced by image-guided cardiac ablation therapy and their correlation with treatment outcomes. Kr. Kwartowitz has aptly demonstrated his capability to accomplish all three tasks in another year. With the requested supplement support for a second year of training, there is little doubt that he will succeed and then follow many trainees that have come before him in the mentor's lab who have gone on to significant faculty positions at major research institutions or to advanced programs in large companies. We believe this request is aligned with the key goals of the ARRA by retaining and further training a talented and productive young scientist who will accelerate progress toward achievement of important specific aims in the parent grant.