Organization	Description	Website
ACR Appropriateness Criteria	Evidence-based guidelines to assist clinicians in making appropriate imaging decisions	https://www.acr.org/Clinical-Resources/ACR-Appropriateness-Criteria
American Society of Radiologic Technologists	Radiation risk calculator	https://www.xrayrisk.com/calculator/calculator.php
Image Gently	Provides information and free educational materials to reduce unnecessary imaging studies in children	https://www.imagegently.org
Image Wisely	Encourages clinicians to optimize the amount of radiation used in medically necessary imaging studies and to eliminate unnecessary procedures in adults	https://www.imagewisely.org
Radiologyinfo.org	Patient-centered website through the ACR that gives radiation doses of conventional imaging studies	https://www.radiologyinfo.org/en/info.cfm?pg=safety-xray#safety-effective-dose-adults
University of California San Diego Department of Radiology	Radiation risk calculator; ideal for principal investigators and informed consent in research trials	https://ehs.ucsd.edu/Radiation_Risk/request/home