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Updated: Sep 15, 2025

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Dosimetric characterization for the flat-panel x-ray source: An electronic brachytherapy unit.

Mengke Qi1,2, Sifu Luo1, Wangjiang Wu1

  • 1School of Biomedical Engineering, Southern Medical University, Guangzhou, Guangdong, China.

Medical Physics
|July 16, 2025
PubMed
Summary

This study validates the flat-panel x-ray source (FPXS) for electronic brachytherapy (EB) by characterizing its dosimetric properties using Monte Carlo simulations and experimental measurements. Results confirm FPXS feasibility for clinical EB applications.

Keywords:
Monte Carlo dose calculationdosimetric characterizationflat‐panel x‐ray source

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • X-ray Imaging

Background:

  • The flat-panel x-ray source (FPXS) is an innovative technology with potential clinical applications.
  • However, its dosimetric characteristics are not well-understood, limiting its use.

Purpose of the Study:

  • To characterize the physical and dosimetric properties of FPXS.
  • To evaluate the feasibility of using FPXS as an electronic brachytherapy (EB) unit.

Main Methods:

  • Developed specialized measurement platforms and procedures using an energy spectrometer, ionization chamber, and Gafchromic film.
  • Employed a Monte Carlo (MC) simulation toolkit (gFPDMC) for dose calculations.
  • Validated MC simulations against experimental dosimetry measurements.

Main Results:

  • Measured and simulated energy spectra showed good agreement (MRE < 9%).
  • FPXS surface dose rate increased exponentially with voltage, reaching 2.45 Gy/min at 40 kV.
  • MC-calculated doses showed excellent consistency with other tools (MAE < 0.40%) and experimental data (PDD deviations < 4%).

Conclusions:

  • The gFPDMC simulation toolkit's precision was rigorously validated.
  • FPXS demonstrates feasibility as an electronic brachytherapy unit due to adequate operating voltage and dose rate.