I'm guessing that the ipod isn't doing any 3D rendering. Or even using any custom software, even. I figure all they need to do in order to do the rotation is to have an image sequence pre-rendered, and then download them to the ipod in sequence order.

So really, all the ipod is doing is showing a sequence of images.

Whether using something with that small of a screen is useful for diagnostic imaging is a different question.
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Tony Fabris