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Small fields measurements with radiochromic films.

Antonio Gonzalez-Lopez1, Juan-Antonio Vera-Sanchez2, Jose-Domingo Lago-Martin1

  • 1Hospital Universitario Virgen de la Arrixaca, Carretera Madrid-Cartagena, Murcia, Spain.

Journal of Medical Physics
|July 15, 2015
PubMed
Summary

Accurate measurement of small radiotherapy fields is challenging. This study presents a novel radiochromic film method that reduces spatial inhomogeneity, enabling precise 2D dose distribution measurements for small fields.

Keywords:
Film dosimetryradiochromic filmssmall fields

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Area of Science:

  • Medical Physics
  • Radiotherapy Dosimetry
  • Radiation Detection

Background:

  • Small radiation fields are crucial in modern radiotherapy techniques like intensity-modulated radiotherapy and stereotactic radiosurgery.
  • Accurate dose distribution measurement in small fields presents significant challenges due to dosimeter limitations.
  • Radiochromic (RC) films offer desirable properties for small field dosimetry but suffer from spatial inhomogeneity.

Purpose of the Study:

  • To develop and validate a 2D measurement method using radiochromic films for small radiotherapy fields.
  • To reduce spatial inhomogeneities inherent in RC films and their digitizing process.
  • To assess the accuracy of the proposed method for measuring output factors and dose distributions in small fields.

Main Methods:

  • A novel method employing registration and averaging of multiple RC film measurements to cancel spatial inhomogeneities.
  • Two-dimensional (2D) dose distribution measurements for field sizes ranging from 0.5 × 0.5 cm² to 10 × 10 cm² using 6 and 15 MV photon beams.
  • Comparison of output factor measurements with PinPoint and Semiflex ionization chambers and dose profiles with Monte Carlo simulations.

Main Results:

  • The developed RC film method effectively reduces spatial inhomogeneities.
  • Good agreement was observed between RC film measurements and ionization chamber measurements for field sizes ≥ 2 × 2 cm².
  • Excellent agreement was found between measured and Monte Carlo simulated dose profiles for a 1 × 1 cm² field.

Conclusions:

  • The presented method provides accurate 2D dose measurements for small radiotherapy fields.
  • The technique enhances the reliability of radiochromic film dosimetry in challenging small field scenarios.
  • This approach is expected to be valuable for accurate dosimetry in advanced radiotherapy applications.