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Lung Capacity01:47

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Evaluating Regional Pulmonary Deposition using Patient-Specific 3D Printed Lung Models
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Technical note: Simulation of lung counting applications using Geant4.

Henri Jutila1, Paul Greenlees1, Tiina Torvela2

  • 1Accelerator Laboratory, Department of Physics, University of Jyväskylä, FI-40014 Jyväskylä, Finland; Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|April 1, 2023
PubMed
Summary
This summary is machine-generated.

A Geant4 simulation package was developed for lung counting applications. The simulation accurately reflects experimental measurements of radiation from Am-241, validating its use for optimizing detector configurations.

Keywords:
Geant4 simulationLow-energy gamma-ray spectraLung countingVoxel phantom

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Area of Science:

  • Medical Physics
  • Computational Physics
  • Radiation Detection

Background:

  • Lung counting is crucial for assessing internal radioactive contamination.
  • Accurate detector simulations are needed to optimize measurement efficiency and reliability.

Purpose of the Study:

  • To develop and validate a Geant4 simulation package for lung counting.
  • To compare simulation results with experimental data for Am-241 activity.
  • To assess the impact of chest wall attenuation on photon detection.

Main Methods:

  • Utilized Geant4 for simulating detector configurations for lung counting.
  • Employed a plastic phantom with Am-241 for experimental measurements.
  • Simulated Am-241 distribution in the ICRP adult reference computational phantom.
  • Calculated photopeak efficiency and photon transmission as a function of energy and detector angle.

Main Results:

  • Simulated detector response showed good agreement with experimental data.
  • Simulated count rates below 100 keV were 10.0(7)% higher than experimental.
  • Chest wall attenuated 58.3(4)% of photons below 100 keV.
  • Transmission of 59.5 keV gamma rays varied from 13.8(2)% to 38.0(4)% with detector angle.

Conclusions:

  • The Geant4 simulation package is a reliable tool for lung counting applications.
  • The simulation accurately predicts detector response and validates its use for optimization.
  • Results support the development of improved detection geometries for internal contamination monitoring.