Society of Radiology North America, reputed to be the RSS of the one (RSNA) established 1919., the largest organization of professional North American continent in the field of knowledge .

this forum is the largest gathering in the world each year in the city of Chicago in the month of November. At the end of 2008, 56000 specialist company.

this forum in 2008, more than 42,000 members. and its center in Illinois.