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Photon fluence and dose estimation in computed tomography using a discrete ordinates Boltzmann solver
1Department of Mining and Nuclear, Missouri University of Science and Technology, 301 W14th Street, Rolla, MO, 65401, USA.
Scientific Reports
|July 16, 2020
Summary
This study validates DOCTORS software for CT dose estimation, finding good agreement with Monte Carlo methods. The software
Area of Science:
- Medical Physics
- Computational Imaging
- Radiation Dosimetry
Background:
- Accurate dose estimation is crucial for computed tomography (CT) safety.
- Deterministic methods offer potential for faster simulations compared to Monte Carlo.
- The DOCTORS software package models CT scans using the discrete ordinates method.
Purpose of the Study:
- To validate the DOCTORS software for cone-beam and axial CT dose estimation.
- To compare DOCTORS deterministic simulations against Monte Carlo benchmarks.
- To assess the impact of simulation parameters on dose calculation accuracy.
Main Methods:
- Modeling of CT scans using the DOCTORS software package (discrete ordinates method).
- Simulations performed on water cylinder and abdomen phantoms with varying parameters.
- Benchmarking against Monte Carlo simulations for quantitative comparison.
Main Results:
- DOCTORS simulations showed good agreement with Monte Carlo methods (2.87% RMSD).
- Uncollided photon fluence significantly contributes to absorbed dose in diagnostic X-ray range.
- DOCTORS, especially with GPU acceleration, enables near real-time CT dose estimation.
Conclusions:
- The DOCTORS software provides accurate and rapid dose estimation for CT.
- Deterministic methods are viable for efficient CT dose calculations.
- Uncollided photon transport is accurately modeled via ray-tracing.
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