I can't find anything official, but here are a couple links for you:
http://www.englishforum.ch/family-ma...ltrasound.html
First one is a BB thread about an Aussie woman who will be in Europe at the time she's due for an ultrasound and how easy it is to get one arranged there.
http://www.acegraphics.com.au/articles/wagner02.html
Second one is some guy from the WHO about safety concerns and policy in Europe(Some countries seem to only do scans on high risk women, others routinely).

I have a cousin who married and Australian man and lives just outside of Melbourne now. They have two sets of twins and I'll guarentee they had sonograms/ultrasounds. I've seen the pictures!