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Polarized dosimetry method for Gafchromic EBT3.

José Fernando Pérez Azorin1, Luis Isaac Ramos Garcia2, Diego Maza Ozcoidi3

  • 1Medical Physics Department, Hospital Universitario de Cruces, Plz. Cruces, Barakaldo, Spain.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|August 4, 2016
PubMed
Summary
This summary is machine-generated.

Adding a polarizing film parallel to the coating direction of EBT3 films significantly improves radiochromic dosimetry accuracy. This simple method corrects lateral artifacts in flatbed scanner measurements.

Keywords:
Lateral correctionLight polarizationRadiochromic film dosimetry

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Area of Science:

  • Medical Physics
  • Radiological Physics
  • Dosimetry

Background:

  • Radiochromic films like EBT3 are used for radiation dosimetry.
  • Flatbed scanners are common tools for reading EBT3 films.
  • Lateral effects can introduce artifacts in scanner-based dosimetry.

Purpose of the Study:

  • To analyze polarization changes in scanner light induced by EBT3 films.
  • To develop a new method for correcting lateral effects in EBT3 dosimetry.
  • To evaluate the effectiveness of a proposed polarization-based correction method.

Main Methods:

  • Linear polarizing films were used to analyze polarization changes caused by EBT3 films.
  • Polarizing films were integrated into the EBT3 film scanning process.
  • The method was tested with regular beams and intensity-modulated radiation therapy (IMRT) cases.

Main Results:

  • Dosimetry results showed statistically significant differences compared to conventional EBT3 dosimetry.
  • Alignment of the polarizing sheet's transmission axis relative to the film's coating direction impacted results.
  • Parallel alignment improved dosimetry accuracy and reduced variability; perpendicular alignment worsened results.

Conclusions:

  • Using a polarizing film with its axis parallel to the EBT3 film's coating direction enhances dosimetry.
  • This technique offers an easy and inexpensive solution for correcting lateral artifacts.
  • The method improves the accuracy and reliability of EBT3 film dosimetry.