Quote:
Originally posted by jaguar
I assume becase they map it like a movie from start to end of surgery? Or jsut to sound cool?
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The internal name was "compositing", "4D" was one of the many marketing names. We had 2D modes (which showed a slice of the dataset), 3D modes (which showed surfaces, more or less -- you could show the skin surface, or the blood vessel surface, but not both. Nor strictly true; there was a transparency thing where you could do both, but no color or anything like that), and the compositing mode. In compositing mode you could take opacity ranges, assign color and transparency values to them, and show them. This image is even more than that because the transparency of the skin range clearly varies across the image, but it's the same idea.
These were static datasets -- 4D didn't imply time.