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Dosimetry techniques for narrow proton beam radiosurgery.

S M Vatnitsky1, D W Miller, M F Moyers

  • 1Department of Radiation Medicine, Loma Linda University Medical Center, CA 92354, USA.

Physics in Medicine and Biology
|December 10, 1999
PubMed
Summary

Accurate dosimetry for narrow proton beams in radiosurgery is challenging. This study recommends specific detectors and techniques for precise characterization of proton stereotactic radiosurgery beams as small as several millimeters.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Particle Therapy

Background:

  • Proton stereotactic radiosurgery (PSRS) utilizes narrow proton beams.
  • Accurate dosimetry is crucial for effective PSRS treatment planning.
  • Finite-sized detectors can distort dose measurements in small proton beams.

Purpose of the Study:

  • To compare the performance of various radiation detectors for characterizing narrow proton beams.
  • To recommend practical dosimetry techniques for proton stereotactic radiosurgery.
  • To establish reliable methods for measuring beam characteristics in small-diameter proton beams.

Main Methods:

  • Evaluated 126 and 155 MeV proton beams (2-30 mm diameter collimators).
  • Compared detectors: ionization chambers, diamond detector, Si diode, TLD cubes, radiographic film, radiochromic film.

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  • Assessed central axis depth doses, lateral profiles, and field size dependence.

    • Main Results:

    • Radiochromic film is suitable for profile measurements in all tested narrow beams.
    • Ionization chambers, diamond, and diode detectors agree for beams ≥20 mm.
    • Diode detectors work for beams down to 5 mm; radiochromic film is best for <5 mm beams.

    Conclusions:

    • Specific detectors are recommended for different beam sizes in PSRS dosimetry.
    • Radiochromic film and diode detectors are valuable for small proton beams.
    • Established procedures enable reliable dosimetry characterization of narrow proton beams.