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Characterization of a practically designed plastic scintillation plate dosimeter.

Takeshi Ohta1, Yuki Nozawa1, Shingo Ohira2,3

  • 1Department of Radiology, The University of Tokyo Hospital, Tokyo, Japan.

Medical Physics
|May 31, 2025
PubMed
Summary

A new scintillation plate dosimeter offers high resolution and repeatability for radiotherapy quality assurance. This practical dosimeter demonstrates favorable dose characteristics for precise patient-specific treatments.

Keywords:
CMOS cameracharacteristicsplastic scintillatorscintillator platex‐ray beams

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Dosimetry

Background:

  • Radiotherapy advancements enable precise irradiation but face challenges in resolution, measurement area, and repeatability.
  • Current clinical practice often requires multiple dosimetry systems to overcome measurement limitations.
  • A need exists for a high-resolution, repeatable dosimeter for accurate dose distribution measurements.

Purpose of the Study:

  • To design a practical scintillation plate dosimeter.
  • To evaluate the dosimetric characteristics of the designed system.
  • To assess its suitability for use with linear accelerator x-ray beams.

Main Methods:

  • A scintillation plate dosimeter was constructed using a 0.2 cm scintillation plate and two 2.0 cm Polymethyl methacrylate (PMMA) plates.
  • A Complementary Metal Oxide Semiconductor (CMOS) camera detected scintillation light for dose measurement.
  • Evaluations included dose linearity, reproducibility, temperature and angle dependencies, dose-rate, and x-ray energy dependencies using various linear accelerator beams.

Main Results:

  • Dose linearity error was a maximum of 0.4% over 10–1000 MU.
  • Dose reproducibility showed a coefficient of variation of ±0.062%.
  • Temperature dependency was 0.07%/°C, angular variations were within ±1.3% (post-Cherenkov removal), and x-ray energy dependency ranged from -2.1% to +1.4%.

Conclusions:

  • The developed scintillation plate dosimeter exhibits favorable dose characteristics.
  • The system is suitable for patient-specific quality assurance in radiotherapy.
  • It shows particular promise for volumetric modulated arc therapy applications.