A site from the American College of Radiology and the Radiological Society of North America geared toward patient education of a range of imaging procedures. Although focused on radiology, there are several sonography procedures outlined here.
A 2001 article that describes a study done to figure out ergonomic issues relating to echocardiography. This article outlines some exercises that can help echocardiographers in the work environment. Requires the Adobe Acrobat Reader.