The curves below show the change in the median of the FRL distribution since the beginning of 2012 for different protocols. The graphs have been generated by examining the surveys submitted during a moving 12-month period, where the start and end points of the window have been shifted by daily intervals. The x-axis is the end date of the 12-month interval, the blue line is the median of the corresponding FRL distribution, the red line denotes the current DRL and the light blue region indicates the 25th– 75th percentile range.

Note that the cervical spine, KUB and soft-tissue neck data only go back to 2018 because these protocols were only added to the list of national DRLs and included in the data collection at that time.


MDCT-Fig4-1-CTDI-Head 2024
MDCT-Fig4-1-DLP-Head 2024

Soft-tissue neck

MDCT-Fig4-2-CTDI-Soft Tissue Neck 2024


MDCT-Fig4-2-DLP-Soft Tissue Neck 2024

Cervical spine 

MDCT-Fig4-3-CTDI-Cervical Spine 2024
MDCT-Fig4-3-DLP-Cervical Spine 2024


MDCT-Fig4-4-CTDI-Chest 2024
MDCT-Fig4-4-DLP-Chest 2024


MDCT-Fig4-5-CTDI-Chest Abdomen Pelvis 2024
MDCT-Fig4-5-DLP-Chest Abdomen Pelvis 2024



MDCT-Fig4-6-CTDI-Abdomen Pelvis 2024
MDCT-Fig4-6-DLP-Abdomen Pelvis 2024


MDCT-Fig4-7-CTDI-Kidney Ureter Bladder 2024
MDCT-Fig4-7-DLP-Kidney Ureter Bladder 2024

Lumbar spine

MDCT-Fig4-8-CTDI-Lumbar Spine 2024
MDCT-Fig4-8-DLP-Lumbar spine 2024

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