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National Diagnostic Reference Level Service (NDRLS)
Australian medical imaging providers are required under the ARPANSA Code of Practice (RPS 14 Section 3.1.8) to regularly compare typical patient doses to the national diagnostic reference levels (DRLs).
ARPANSA's NDRLS provides free tools for conducting dose comparisons: login or register for the multi-detector CT survey here or see the relevant imaging modality section for details.