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Carbon beam dosimetry intercomparison at HIMAC

A Fukumura1, T Hiraoka, K Omata

  • 1National Institute of Radiological Sciences, Chiba-shi, Japan.

Physics in Medicine and Biology
|December 30, 1998
PubMed
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International uniformity in carbon beam dosimetry was verified using ionization chambers at the heavy ion medical accelerator. Results confirmed good agreement, establishing a common dosimetry framework for carbon therapy facilities.

Area of Science:

  • Medical physics
  • Radiation oncology
  • Particle therapy

Background:

  • Carbon beam therapy is an advanced cancer treatment modality.
  • Ensuring consistent and accurate radiation dosimetry is critical for patient safety and treatment efficacy.
  • International uniformity in dosimetry is essential for reliable clinical practice and research across different facilities.

Purpose of the Study:

  • To verify international uniformity in carbon beam dosimetry.
  • To compare dose measurements using ionization chambers between different facilities.
  • To establish a common dosimetry framework for carbon therapy.

Main Methods:

  • An intercomparison program was conducted at the Heavy Ion Medical Accelerator (HIMAC).
  • Dose measurements were performed using ionization chambers for unmodulated and modulated carbon beams (290 MeV/nucleon).

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  • Two distinct dosimetry procedures were employed for comparison.

    • Main Results:

    • Evaluated absorbed dose values showed good agreement between the different dosimetry procedures.
    • The intercomparison demonstrated consistency in dose measurements.
    • The study confirmed the reliability of ionization chamber dosimetry for carbon beams.

    Conclusions:

    • The study successfully verified international uniformity in carbon beam dosimetry.
    • A common framework for ionization chamber dosimetry was established between two carbon beam therapy facilities.
    • These findings support the safe and effective implementation of carbon therapy worldwide.