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Related Experiment Video

Updated: Mar 13, 2026

Whole-body PET/MRI of Pediatric Patients: The Details That Matter
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Results from a phantom based multi-centre paediatric computed tomography dose survey.

David L Thiele1, Sarah-Ellyana Aliuddin2, Mike Irvine3

  • 1Biomedical Technology Services, Royal Brisbane and Women's Hospital, Herston, QLD, Australia. david.thiele@health.qld.gov.au.

Australasian Physical & Engineering Sciences in Medicine
|October 13, 2016
PubMed
Summary

A computed tomography (CT) radiation dose survey found that many scans for young children exceeded national diagnostic reference levels (DRLs). Optimizing CT protocols and using weight or girth for DRLs is recommended.

Keywords:
Computed tomographyPaediatric local diagnostic reference levelsPaediatric radiation dose survey

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Area of Science:

  • Medical Imaging Physics
  • Radiological Protection
  • Pediatric Radiology

Background:

  • Computed tomography (CT) scans are crucial for pediatric diagnosis but involve radiation exposure.
  • Establishing appropriate radiation dose reference levels is essential for patient safety.
  • Previous surveys have indicated variability in pediatric CT radiation doses.

Purpose of the Study:

  • To survey radiation doses across multiple CT scanners within an enterprise for pediatric patients.
  • To compare radiation doses based on age and reconstruction methods (filtered back projection vs. iterative reconstruction).
  • To evaluate the suitability of age-based diagnostic reference levels (DRLs) and propose alternatives.

Main Methods:

  • Utilized three age-based pediatric phantoms (1, 5, and 10 years old).
  • Surveyed 27 CT scanners, collecting volume computed tomography dose index and dose length product data for head, chest, and abdomen-pelvis protocols.
  • Recorded reconstruction methods (filtered back projection [FBP] and iterative reconstruction [IR]).

Main Results:

  • Approximately two-thirds of 1-year-old FBP chest scans exceeded the national Baby DRL.
  • Some scanners exceeded national Child DRLs for 1- and 5-year-old phantoms.
  • Statistically significant dose differences between FBP and IR were observed in only about half of the phantom protocols.

Conclusions:

  • The survey highlights the need for radiation dose optimization in pediatric CT at several sites.
  • Proposed local DRLs are better represented by patient weight or girth rather than age.
  • Implementing enterprise-wide DRLs based on anthropometric measurements could improve radiation safety in pediatric CT.