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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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Dose length product to effective dose coefficients in children
Philip W Chu1, Cameron Kofler2, Malini Mahendra3,4
1Department of Epidemiology and Biostatistics, University of California San Francisco, 550 16th Street, Box 0560, San Francisco, CA, 94143, USA.
Pediatric Radiology
|March 16, 2023
Summary
New pediatric effective dose coefficients improve radiation dose estimation in CT scans. These updated values, based on extensive data, correlate well with Monte Carlo simulations for better patient safety.
Area of Science:
- Medical Physics
- Radiology
- Pediatric Imaging
Background:
- Estimating effective dose (patient radiation exposure) from CT scans typically requires complex Monte Carlo simulations.
- A simpler method uses dose length product (DLP) with a scalar coefficient, but accurate pediatric coefficients are needed.
Purpose of the Study:
- To develop and validate pediatric effective dose coefficients for CT scans.
- To assess the agreement of these new coefficients with established Monte Carlo simulation methods.
Main Methods:
- Utilized a large, multicenter dataset of 128,397 pediatric CT scans (2015-2020).
- Generated effective dose coefficients stratified by age, body region, and diameter.
- Compared estimated effective doses using new coefficients and DLP against Monte Carlo-derived doses.
Main Results:
- Developed new pediatric effective dose coefficients, generally higher than previous estimates.
- Coefficients varied significantly by age, being substantially higher for infants (<1 year) compared to older children.
- Age-based coefficients showed moderate to strong correlations (0.52-0.80) with Monte Carlo simulation results.
Conclusions:
- The new pediatric effective dose coefficients provide an updated and more accurate method for dose estimation.
- These coefficients facilitate easier estimation of effective dose using readily available scanner-reported DLP data.
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