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Outdated Browser Detected On June 15 2022 ARRT will stop allowing Internet Explorer IE to access our websites. Microsoft Edge a more secure and modern browser has replaced IE. You may use Edge or any other supported browser Chrome Firefox Safari to access this website. THE AMERICAN REGISTRY OF RADIOLOGIC TECHNOLOGISTS ARRT A leading credentialing organization ARRT offers certification and registration in a wide range of radiologic disciplines helping people who work in medical imaging and radiation therapy to develop their careers.