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A comparison study of size-specific dose estimate calculation methods.

Roshni A Parikh1,2, Michael A Wien3, Ronald D Novak1,4

  • 1Department of Radiology, Rainbow Babies and Children's Hospital, University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine, 11100 Euclid Ave., Cleveland, OH, 44106, USA.

Pediatric Radiology
|September 28, 2017
PubMed
Summary
This summary is machine-generated.

Automated methods and body weight are accurate for calculating pediatric size-specific dose estimates (SSDE) in CT scans. Manual thickness measurements are acceptable for smaller children, while weight is practical for larger ones.

Keywords:
ChildrenComputed tomographyRadiation doseSize-specific dose estimate

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Area of Science:

  • Medical Physics
  • Radiology
  • Pediatric Imaging

Background:

  • Size-specific dose estimate (SSDE) is an improved metric for individual patient dose estimation in CT scans.
  • Various methods exist for SSDE calculation, including thickness-based and weight-based techniques.

Purpose of the Study:

  • To compare the accuracy of thickness versus weight measurements for calculating SSDE in pediatric body CT examinations.
  • To evaluate different automated and manual methods for SSDE calculation.

Main Methods:

  • Retrospective analysis of 109 pediatric body CT exams.
  • Comparison of two automated (effective diameter, water-equivalent diameter) and two manual (averaging lateral, averaging lateral and anteroposterior measurements) methods.
  • Inclusion of body weight as a fifth method (method E) for comparison.

Main Results:

  • High concordance correlation (ρc > 0.92) was observed between SSDE calculation methods across the entire pediatric population.
  • Subgroup analysis revealed a wider range in concordance (0.42-0.99).
  • Poor correlation (ρc < 0.77) and significant percentage differences (20.8%-51.0%) were found when comparing SSDE methods with CTDIvol.

Conclusions:

  • Automated algorithms provide accurate and efficient SSDE calculations.
  • Manual thickness-based methods are acceptable for pediatric patients with body width <30 cm.
  • Body weight offers a practical approach for estimating SSDE in pediatric patients with body width ≥20 cm.