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Radiation dosimetry using polymer gels: methods and applications.

M McJury1, M Oldham, V P Cosgrove

  • 1Joint Department of Physics, Institute of Cancer Research, Sutton, Surrey, UK.

The British Journal of Radiology
|November 7, 2000
PubMed
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Polymer gel dosimetry offers accurate measurement of complex radiation doses for advanced radiotherapy. This versatile technique provides high spatial resolution for precise treatment verification.

Area of Science:

  • Medical Physics
  • Radiotherapy
  • Dosimetry

Background:

  • Complex radiotherapy delivery demands precise 3D dose measurement.
  • Emerging polymer gel dosimeters address these requirements.
  • Accurate dosimetry is crucial for radiotherapy verification.

Purpose of the Study:

  • To provide a practical overview of polymer gel dosimetry.
  • To cover gel manufacture, imaging, calibration, and applications.
  • To highlight polymer gel dosimetry for radiotherapy verification.

Main Methods:

  • Polymerization of acrylic molecules in a gel matrix proportional to absorbed dose.
  • 2D/3D measurement of polymer distribution using MRI or optical tomography.
  • Calibration of images to convert into radiation dose distributions.

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Main Results:

  • Reproducible gel manufacture with dose accuracy within 3-5% for 0-10 Gy.
  • Achievable in-plane image resolution of 1 mm x 1 mm and slice thickness of 2-5 mm.
  • Successful verification of brachytherapy, intensity-modulated radiotherapy, and stereotactic radiosurgery.

Conclusions:

  • Polymer gel dosimetry is a valuable and versatile technique for radiotherapy verification.
  • It meets the demands of complex radiotherapy delivery techniques.
  • Further application in various radiotherapy modalities is confirmed.