He should be just fine, but whenever anesthesia is involved, there is no way to know for sure.
The more common name for this is scintigraphy.
You will likely get many results if you search for it on YT.
A few peple here have been through this.
My girl is liver compromised (post BAT of 106 once), but her ultrasound (not very accurate) came back okay, she is older, and she doesn't have neurologic symptoms, I opted against going any further with testing.