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Reference dosimetry using radiochromic film.

Frédéric Girard1, Hugo Bouchard, Frédéric Lacroix

  • 1Département de Radio-Oncologie, Centre hospitalier de l’Université de Montréal (CHUM), Montréal, Québec, Canada. fregir@videotron.ca

Journal of Applied Clinical Medical Physics
|November 15, 2012
PubMed
Summary
This summary is machine-generated.

Radiochromic films like GAFCHROMIC EBT2 are suitable for reference dosimetry when environmental factors such as temperature and humidity are controlled. Proper handling ensures dose measurement accuracy within ±4%.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Radiotherapy Quality Assurance

Background:

  • Radiochromic films are utilized for dose measurement in radiotherapy.
  • Factors influencing film dose response require thorough investigation for accurate dosimetry.
  • Ensuring consistency in reference dosimetry is critical for patient safety.

Purpose of the Study:

  • To identify and quantify factors affecting radiochromic film dose response.
  • To assess the suitability of radiochromic films for reference dosimetry.
  • To evaluate the impact of environmental conditions on film performance.

Main Methods:

  • Investigated the effect of storage temperature (4°C vs. room temperature) on GAFCHROMIC EBT2 film stability.
  • Determined the influence of relative humidity variations (20%–80%) on film optical density.
  • Compared film dose measurements with an A12 ionization chamber under controlled conditions.
  • Performed intensity-modulated radiation therapy quality controls using EBT2 films.

Main Results:

  • Storing films at 4°C improved stability but did not eliminate post-irradiation optical density increase.
  • Relative humidity variations significantly impacted optical density, potentially causing up to 15% dose errors.
  • Film temperature during scanning affected optical density measurements.
  • Controlled conditions yielded dose differences within ±4% (2σ) between films and ionization chamber (20–350 cGy).

Conclusions:

  • Radiochromic films (EBT/EBT2) are suitable for reference dosimetry when temperature and humidity are meticulously controlled.
  • Environmental factors significantly influence film dose response, necessitating strict monitoring.
  • The Anisotropic Analytical Algorithm showed limitations in calculating doses for highly modulated treatment plans.