have you joined
Liver_Shunt_And_MVD_Support@yahoogroups.com
i would do that and ask questions about the stones, etc as they helped me a ton when they wanted to do scinitigraphy on dd and after learning from them never put her through the test. Due to it being radio active dye there are not many able to do this and i believe only one guy in california Dr Broome does it. I know dr Tobias has this at her facility
here is the info on it - this is the facility we were referred to by vet - they keep the dog all day and do not keep over night - they shoot a dye capsule through the butt and take hundreds of pics as it travels through the body to see if it by passes the liver. If the dog is restless they will sedate if not they do it when dog is awake - the reason you have to wait all day is all radio active material has to be out of body before they can let you take the dog home
AVMI- Portal Scintigraphy