http://www.sirweb.org/         
Society of Interventional Radiology

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

http://www.lammico.com/ 
Louisiana Malpractice Carrier

http://www.mrisafety.com/ 
MRI Safety Questions Answered

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

http://radiographics.rsnajnls.org/ 
Radiographics Online Journal

http://www.auntminnie.com/index.asp?sec=def  
Radiology News