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Related Experiment Video

Updated: Jun 13, 2025

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Development of a proton CT imaging system using scintillator-based range detection.

Meiqi Liu1, Yuxiang Wang1,2, Yue Gu1

  • 1School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui, China.

Medical Physics
|September 9, 2024
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Summary
This summary is machine-generated.

This study introduces a novel proton computed tomography (PCT) system using scintillators for accurate relative stopping power (RSP) mapping. The developed PCT system significantly improves accuracy for proton therapy and irradiation experiments.

Keywords:
proton computed tomography (PCT)relative stopping power (RSP)scintillator‐based range detection

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Area of Science:

  • Medical Imaging
  • Particle Physics
  • Radiotherapy Technology

Background:

  • Proton therapy accuracy is limited by proton range uncertainties, often due to imprecise CT number to relative stopping power (RSP) conversion.
  • Proton computed tomography (PCT) offers a solution by directly acquiring RSP maps, reducing these uncertainties.

Purpose of the Study:

  • To develop and validate a novel scintillator-based proton computed tomography (PCT) imaging system.
  • The system aims for accurate reconstruction of relative stopping power (RSP) maps.

Main Methods:

  • A PCT system was designed using a pencil-beam collimator, scintillator, and CMOS camera.
  • Monte Carlo simulations calibrated light ranges to water-equivalent ranges (WEPLs).
  • WEPLs were measured for tissue-equivalent inserts, and RSP maps were reconstructed using filtered back projection.

Main Results:

  • Calibrated proton ranges showed minimal differences (<0.18 mm) from reference values.
  • WEPL measurements achieved accuracy better than 1%.
  • Phantom reconstructions demonstrated low average RSP errors (0.38% with 360 projections), and mouse imaging revealed clear anatomical structures.

Conclusions:

  • The developed PCT imaging system accurately acquires RSP maps.
  • This technology has the potential to enhance dose calculation accuracy in proton therapy and preclinical proton irradiation research.