You need a skills assesment from ASMIRT.
Diagnostic Radiography/Medical Imaging Technology or Radiation Therapy qualifications gained outside Australia are not immediately accepted or recognised for issue of the Australian Society of Medical Imaging and Radiation Therapy (ASMIRT) Statement of Qualification which is required for eligibility to ASMIRT membership and by the Australian Department of Immigration and Border Protection for migration purposes. The ASMIRT Statement of Qualification and corresponding skills assessment letter is required for immigration purposes in the skilled migration program.
https://www.asmirt.org/careers-and-employment/overseas-assessments