You can already get '3D' ultrasound, which is many individual images stitched together. Doesn't work if the baby moves around alot. Expensive and not covered by health insurance.
I don't think vet budgets are very large or favour high tech solutions but maybe you know otherwise.
I had a 3D ultrasound done at this place - http://www.firstviewultrasound.com - not long ago. I guess expensive means different things to different people, but I wound up with a CD full of a few dozen images and some movies for somewhere in the neighborhood of $100, which I thought it was a pretty good deal.
I don't think vet budgets are very large or favour high tech solutions but maybe you know otherwise.