The British Society of Gastrointestinal and Abdominal Radiology has a great 'HOW TO' Barium Swallow guide followed by a selection of 20 example barium swallow cases covering a range of common and rarer conditions. A great teaching resource for trainees learning fluoroscopic swallow examinations.
Mount Sinai's Radiology Charts is an easy access educational teaching tool for on-line review of the imaging and pathology of all focal lesions of all major organ systems. Just click on an Organ system and hover your mouse over any cell (or click if using a tablet) to see an image.
Radiopaedia.org is a free educational radiology resource with one of the web's largest collections of radiology cases and reference articles. Their aim is to create the best radiology reference available, and we think they're done a pretty good job! Probably the best reference site for radiology trainees.
Ultrasoundcases.info is a large free teaching file containing 1000's of general ultrasound cases. If you've just scanned a patient and you're not quite sure what you've seen, then look here. Well categorised and very user friendly, an invaluable resource and probably the best ultrasound reference site.
Radiologyassistant.nl is a free resource providing up-to-date radiological education for trainees and consultants. They focus on common clinical problems and each topic is presented by an expert in that field. Probably the best revision resource for trainees, and particularly useful when on-call.
CTisus.com is a free resource providing up-to-date CT protocols, case studies and lectures on many different topics relating to CT imaging for trainees and consultants.
Introduction to radiology is a free programme from the University of Virginia Department of Radiology. There are a selection of online interactive tutorials covering many aspects of radiology. It is intended as a self tutorial for residents and medical students. Self quizzes are provided for practice and self assessment.
The Liver Imaging Atlas is a free, web-based reference of liver CT, MRI and ultrasound imaging that contains a comprehensive spectrum of liver diseases and their imaging features. It is great as a teaching resource for trainees and as a tool for construction of image-based differential diagnoses by radiologists in practice.
HeadNeckBrainSpine.com is a neuroradiology anatomy reference site using an intuitive interface mimicing a radiology workstation. Simply hover the cursor over a structure of interest and its name will appear underneath the image. Clicking the mouse button in an active area will synchronize and cross reference all image planes. Fantastic for learning and checking anatomy while reporting or on-call.