GE’s Standard Edition of Medcyclopedia includes at no charge all text and images from The Encyclopaedia of Medical Imaging’s eight book volumes: Physics, Techniques and Procedures, Normal Anatomy, Musculoskeletal and Soft Tissue Imaging, Gastrointestinal and Urogenital Imaging, Chest and Cardiovascular Imaging, Neuroradiology and Head and Neck Imaging, and Paediatric Imaging. There is a total of 18,000 topics and10,000 images.
The site notes that you are free to copy text and images for non-commercial use in lectures, articles, etc. provided that you refer to the source.
Thanks to the Insurance Defense Blog.