it doesn't necessarily have to be as crisp as an mri or ct though that would obviously be great. remember the "fuzzy" technology (ultrasound) you made an example of is being used all the time for simple procedures. i have done these myself. (and i agree, it's damn grainy and yet we use it and are happy about it.)
if dean has produced workable 3d realtime fluoro...where you can check equipment positioning from xyz angles nearly instantaneously...he has achieved something remarkable even if the image is not perfect yet.
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