I was offered an ultrasound of my Lucy’s head and eye (she had a punctured deflated eye and it got infected when she was old). I was surprised they said the ultrasound would only be $50, but that was a vet teaching hospital.
I think they do anaesthetize a bird beforehand.
I don’t know if they would have to pluck the feathers (from the area to be scanned) or just put ultrasound gel on the feathers.
I voted “no” because Lucy was very old and I couldn’t believe there could be a cancer causing her eye infection when I SAW HER rubbing her eye on the perch. I didn’t think she’d benefit much and felt that would be putting her at risk.
But I would totally do it for liver or heart concerns, lung issues, etc. imaging so much better than X-ray.