The curves below show the cumulative distributions for the DLP and CTDIvol from adult DRL surveys submitted to ARPANSA in 2022. The plots display the percentage of surveys that achieved a facility reference level (FRL) below the dose specified on the x-axis. The blue curve represents all of the submitted data, the orange curve represents the surveys where iterative reconstruction (IR) was used and the green curve represents the surveys where IR was not used. The present national DRL is represented by the vertical red line. The national DRL was derived from data submitted in earlier years and, consequently, the DRLs do not match the 75th percentile of the plotted distributions.


Head CTDI distribution
Head DLP distribution 2022

Soft tissue neck

Figure 2: Cumulative CTDI distribution soft tissue neck
Figure: Soft Tissue Neck Cumulative DLP distribution


Cervical spine

Cervical spine CTDI distribution
Fig3-3 Cumulative DLP distribution Cervical Spine 2022



Chest abdomen pelvis

Cumulative-CTDI-distribution-Chest Abdomen Pelvis
Cumulative-DLP-distribution-Chest Abdomen Pelvis

Abdomen Pelvis

-CTDI-distribution-Abdomen Pelvis
Cumulative-DLP-distribution-Abdomen Pelvis

Kidney Ureter Bladder


Lumbar spine

Cumulative-CTDI-distribution-Lumbar spine
Cumulative-DLP-distribution-Lumbar spine

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