American College of Radiology (ACR) - Appropriateness Criteria
"The ACR Appropriateness Criteria® (AC) are evidence-based guidelines to assist referring physicians and other providers in making the most appropriate imaging or treatment decision for a specific clinical condition."
Quick Links: ACR Manual on Contrast
University of Virginia - Radiology Tutorials
An online collection of introductory interactive radiology tutorials.
Radiology teaching site for medical students and those starting out in radiology. Over 20,000 pages of content.
Harvard - Lieberman's eRadiology
Teaching programs from Harvard Medical School curriculum designed for students, residents, and staff. Includes interactive tutorials, classics collection, and primary care cases.
Interactive Radiology Atlas
Hundreds of images that allow you to highlight specific structures. Views of the complete body.
Contains neuroanatomy modules and over 400 cases.