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Radiation Dose Management in Pediatric Brain CT According to Age and Weight as Continuous Variables

Yusuke Inoue1, Hiroyasu Itoh2, Anri Waga1

  • 1Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara 252-0374, Japan.

Tomography (Ann Arbor, Mich.)
|April 21, 2022
PubMed

Insights

This study establishes age- and weight-based diagnostic reference levels (DRLs) for pediatric brain computed tomography (CT) scans. Mathematical models were developed to estimate radiation dose indices, aiding in consistent DRL application.

Area of Science:

  • Radiology and Imaging
  • Pediatric Medical Physics
  • Radiation Dose Optimization

Background:

  • Establishing accurate Diagnostic Reference Levels (DRLs) for pediatric brain computed tomography (CT) is crucial for radiation safety.
  • Existing DRLs may not adequately account for variations in patient size and age, particularly in pediatric populations.
  • Understanding the relationship between radiation dose indices and pediatric patient characteristics is essential for dose optimization.

Purpose of the Study:

  • To investigate the relationship between radiation dose indices (volume CT dose index and dose length product) and age/weight in pediatric brain CT.
  • To derive equations for estimating age- and weight-dependent standard dose indices.
  • To facilitate the establishment and application of DRLs for pediatric brain CT.

Main Methods:

  • Retrospective analysis of 980 pediatric brain CT examinations.
  • Curve fitting (logarithmic, power, bilinear functions) to plot CT dose indices against age and weight.
  • Derivation of equations to estimate age- and weight-dependent standard dose indices and calculation of associated errors.

Main Results:

  • A biphasic increase in radiation dose indices was observed with increasing age and weight in pediatric brain CT.
  • Logarithmic, power, and bilinear functions effectively modeled the relationship between dose indices and patient parameters.
  • Weight was found to be a slightly better predictor of dose than age, with bilinear functions yielding the best fit.

Conclusions:

  • Curve fitting provides a robust method for determining standard dose indices in pediatric brain CT.
  • The derived equations enable the estimation of age- and weight-dependent standard dose indices, supporting DRL establishment.
  • This approach is expected to improve the consistency and applicability of DRLs in pediatric imaging facilities.

Keywords:
braincomputed tomographydiagnostic reference levelpediatricsradiation dose

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