Association for Radiologic Technologists"The American Registry of Radiologic Technologists (ARRT) is a leading credentialing organization that recognizes qualified individuals in medical imaging, interventional procedures, and radiation therapy. We offer certification and registration in a wide range of disciplines, helping people who work in medical imaging and radiation therapy to develop their careers. With more than 330,000 registrants, we promote high standards of patient care with each new credential we award."