Here you will find resources that are either OERs with a Creative Commons (CC) license or media that is currently in the Public Domain (usually the copyright has expired). When using these resources, check the licenses or verify that the information is in the public domain.
"OER are teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and re-purposing by others." ~ William & Flora Hewlett Foundation
Image: "Open Educational Resources" by Ron Mader is licensed under CC BY 2.0
For a more comprehensive overview on OER, see:
Type "ULTRASOUND" or "MEDICAL IMAGING" in the search box to explore interactive tutorials.
Undergraduate Diagnostic Imaging Fundamentals by Brent Burbridge of the University of Saskatchewan
Adapted from Rowan College