People are often surprise when they discover some medical devices run Microsoft embedded Operating systems. As a matter of fact Windows Embedded offers a series of very reliable Operating Systems for specialized devices.
If you are curious to learn about actual successful stories in the medical space using Windows Embedded, then I invite you to read this case study on the news center, and to watch this video:
EDIT: I have just pointed to this other interesting device running CE and showing its usage in a medical scenario: http://www.neuroptics.com/
Bear in mind these are isolated examples but are definitively not unique to the medical space as Windows Embedded is recognized as a valuable, stable, robust and reliable offer by the medical space.