American Reg MRI Tech (ARMRIT), ARRT-MR Magnetic Res Imaging (ARRT-MR), ARRT-R Radiography (ARRT-R): Certified by the American Registry of Radiologic Technologists in Magnetic Resonance Imaging ARRT(MR) or Radiography ARRT(R) or American Registry of Magnetic Resonance Imaging Technologist (ARMRIT). The MRI Technologist, under general supervision of a Radiologist, performs magnetic resonance imaging (MRI) procedures on ambulatory and hospital patients as requested by a physician or other licensed provider for the diagnosis of disease and injury in accordance with established protocols.