Medical Center, professional approach

American Board of Radiology
http://www.theabr.org/

American Registry of Radiologic Technologists
http://www.arrt.org/

American Society of Radiologic Technologists
http://www.asrt.org/

American Roentgen Ray Society
http://www.arrs.org/

American College of Radiology
http://www.acr.org/

Radiological Society of North America
http://www.rsna.org/

International Society of Radiographers and Radiologic Technologists
http://www.isrrt.org/