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Related Experiment Video

Updated: Aug 12, 2025

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
08:34

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

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Development of optimised tissue-equivalent materials for proton therapy.

H Cook1,2, M Simard1,3,4, N Niemann5

  • 1Department of Medical Physics and Biomedical Engineering, University College London, WC1E 6BT, United Kingdom.

Physics in Medicine and Biology
|January 25, 2023
PubMed
Summary
This summary is machine-generated.

New epoxy-resin materials offer improved accuracy for proton therapy dosimetry. These optimized tissue-equivalent materials minimize uncertainties in absorbed dose and range measurements, advancing clinical phantom development for precise proton therapy.

Keywords:
PhantomsProton therapyTissue-equivalence

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Area of Science:

  • Medical Physics
  • Materials Science
  • Radiation Oncology

Background:

  • Proton therapy requires accurate tissue-equivalent materials for dosimetry.
  • Existing phantom materials introduce uncertainties in dose and range measurements.
  • Optimized materials are crucial for enhancing the precision of proton therapy.

Purpose of the Study:

  • To develop and characterize novel epoxy-resin based tissue-equivalent materials for proton therapy.
  • To formulate materials optimized for proton and photon interactions.
  • To create vertebra bone and skeletal muscle-equivalent plastics.

Main Methods:

  • A mathematical model was employed to formulate epoxy-resin based tissue-equivalent materials.
  • Theoretical comparison of new and commercial materials against biological tissue compositions.
  • Experimental characterization including mass density, relative stopping power (RSP), and CT scans.

Main Results:

  • Existing materials, particularly commercial bone materials, showed up to 8% range difference.
  • Optimized formulations accurately mimicked target human tissues within 1%-2% for mass density and RSP.
  • CT-predicted RSP agreed within 1%-2% of experimental RSP, validating clinical phantom suitability.

Conclusions:

  • A novel tool for formulating optimized tissue-equivalent materials for proton dosimetry has been developed.
  • The new materials demonstrate superior performance compared to existing options.
  • These advancements will improve clinical proton phantoms and ensure accurate proton dosimetry.