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Related Experiment Videos

Two-dimensional transmitted dose measurements using a scanning liquid ionization chamber EPID.

Mohammad Mohammadi1, Eva Bezak

  • 1Department of Medical Physics, Royal Adelaide Hospital, Adelaide, SA 5000, Australia. MMohamma@mail.rah.sa.gov.au

Physics in Medicine and Biology
|May 26, 2006
PubMed
Summary

Scanning liquid ionization chamber electronic portal imaging devices (SLIC-EPIDs) can accurately measure transmitted dose in 2D. Calibration using ionization chambers and correction factors ensures reliable dosimetric measurements for radiotherapy applications.

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Area of Science:

  • Medical Physics
  • Radiotherapy Physics
  • Radiation Dosimetry

Background:

  • Electronic portal imaging devices (EPIDs) are crucial for quality assurance in radiotherapy.
  • Accurate 2D transmitted dosimetry is essential for verifying treatment plans.
  • Scanning liquid ionization chamber EPIDs (SLIC-EPIDs) offer potential for improved dosimetric capabilities.

Purpose of the Study:

  • To investigate the dosimetric accuracy of SLIC-EPIDs for 2D transmitted dose measurements.
  • To develop and validate a calibration method for SLIC-EPIDs using extended dose range (EDR2) film.
  • To establish correction factors for improving the accuracy of EPID-based dosimetry.

Main Methods:

  • Developed a calibration protocol using an ionization chamber on the central axis to convert SLIC-EPID pixel values to dose.

Related Experiment Videos

  • Investigated the relationship between pixel values, dose rate, and absorbed dose for various linac output repetition rates.
  • Derived correction factor matrices (CFMs) using off-axis ratios from EPID and EDR2 film measurements for different source-to-EPID distances (SEDs).
  • Compared corrected 2D relative dose maps from SLIC-EPID with EDR2 film using a gamma function algorithm (DTA=2.5 mm, DeltaDmax=1%).

    • Main Results:

    • Established a method to convert SLIC-EPID pixel values to absolute dose.
    • Identified relationships between pixel values, dose rate, and absorbed dose.
    • Correction factor matrices (CFMs) were derived for various SEDs.
    • Corrected SLIC-EPID dose maps showed good agreement with EDR2 film, passing gamma analysis criteria.

    Conclusions:

    • EPIDs require calibration with appropriate 2D correction factors for accurate 2D dosimetric applications.
    • SLIC-EPIDs demonstrate potential for accurate transmitted dose measurements in radiotherapy verification.