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Beam profile analysis using GafChromic films

M Sanders1, J Sayeg, C Coffey

  • 1Neurosurgery Department, University of Kentucky Medical Center, Lexington.

Stereotactic and Functional Neurosurgery
|January 1, 1993
PubMed
Summary
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GafChromic film dosimetry accurately evaluated Leksell Gamma Knife beam profiles, matching conventional methods. This rapid technique is suitable for quality assurance programs in radiation oncology.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiosurgery

Background:

  • Leksell Gamma Knife acceptance testing requires precise beam profile analysis.
  • Conventional film dosimetry is time-consuming and may involve external analysis.
  • Developing efficient in-house dosimetry methods is crucial for quality assurance.

Purpose of the Study:

  • To evaluate the accuracy and efficiency of GafChromic film dosimetry for Leksell Gamma Knife beam profiles.
  • To compare GafChromic film dosimetry results with conventional film analysis.
  • To assess the suitability of GafChromic films for routine quality assurance.

Main Methods:

  • GafChromic films were irradiated to 100 Gray for each collimator size and plane.
  • Films were analyzed using a scanning helium-neon laser densitometer (5-10 micron aperture).

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  • Digitized density profiles were curve-fitted and converted to relative dose using a Cobalt-60 calibration curve.

    • Main Results:

    • GafChromic film dosimetry results showed excellent agreement with conventional film analysis by Leksell.
    • The method provided accurate data for beam profiles across different collimator sizes.
    • Analysis using GafChromic films was demonstrated to be rapid.

    Conclusions:

    • GafChromic film dosimetry is an accurate and efficient alternative for Leksell Gamma Knife beam profile analysis.
    • This technique can be readily integrated into a comprehensive quality assurance program.
    • The findings support the use of GafChromic films for routine dosimetry in radiosurgery.