You need a B.Medicine/B.Surgery degree and then specialise to become a radiologist.
You can do an Undergraduate MBBS degree at:
University of New South Wales
University of Newcastle
University of Melbourne
Monash University
University of Adelaide
University of Western Australia
University of Tasmania
James Cook University (I think)
University of Queensland (Provisional entry)
Keeping in mind that a UMAT + Interview are also used in the selection process at most of these universities.
Doing the Diagnostic Radiography degree at USYD will allow you to become a radiographer, which is different to being a radiologist.