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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
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New Geant4-DNA physics model for electron track-structure simulations in gold nanoparticles.

Ioannis Polopetrakis1, Ioanna Kyriakou1, Dousatsu Sakata2,3,4

  • 1Medical Physics Laboratory, Department of Medicine, University of Ioannina, Ioannina 45110, Greece.

Physics in Medicine and Biology
|July 24, 2025
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A new physics model for electron simulations in gold nanoparticles (AuNPs) significantly improves accuracy. This enhanced Geant4-DNA model provides better stopping power data and corrects low-energy overestimations for radiotherapy applications.

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Area of Science:

  • Medical Physics
  • Computational Physics
  • Materials Science

Background:

  • Accurate electron track-structure simulations are crucial for gold nanoparticle (AuNP)-aided radiotherapy.
  • Current Geant4-DNA models have deficiencies in simulating electron interactions within AuNPs.
  • Improving cross-section data is essential for precise dose enhancement calculations.

Purpose of the Study:

  • Develop an improved Geant4-DNA physics model for electron track-structure simulations in AuNPs.
  • Enhance accuracy over a broad energy range (10 eV to 1 MeV).
  • Address limitations of the existing default model for AuNPs.

Main Methods:

  • Developed a new energy-loss function for solid gold (Au) optimized with optical data.
  • Calculated inelastic cross sections using the relativistic plane wave Born approximation (RPWBA).
  • Incorporated low-energy corrections and a Landau damping approximation for plasmon decay.

Main Results:

  • The new model shows excellent agreement (~2%) with NIST stopping power data, a significant improvement over the previous ~6%.
  • Eliminated unphysical low-energy overestimations present in the default Geant4-DNA model.
  • Achieved better agreement with advanced physics models for solid gold.

Conclusions:

  • The developed model offers more accurate electron transport simulations within AuNPs.
  • Enables better quantification of the secondary electron spectrum responsible for dose enhancement.
  • Facilitates more precise calculations of radiobiological effects in AuNP-aided radiotherapy.