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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
Summary
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.
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.
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