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Related Experiment Videos

Measurement possibilities using an electronic portal imaging device

M C Kirby1, P C Williams

  • 1North Western Medical Physics Department, Christie Hospital, Manchester, UK.

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
|November 1, 1993
PubMed
Summary

Electronic portal imaging devices (EPIDs) verify radiotherapy accuracy. This study shows EPIDs can also assess multileaf collimator reproducibility and measure in vivo exit doses, enhancing quality control in radiation therapy.

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Area of Science:

  • Medical Physics
  • Radiotherapy Quality Assurance

Background:

  • Portal imaging is crucial for radiotherapy quality control, ensuring accurate patient setup and treatment volume coincidence.
  • Electronic Portal Imaging Devices (EPIDs) are primarily used for verification but possess potential for advanced applications.

Purpose of the Study:

  • To explore novel applications of EPIDs beyond standard verification.
  • To assess the reproducibility of a multileaf collimator (MLC) system using EPIDs.
  • To determine the feasibility of using EPIDs for in vivo exit dose measurements.

Main Methods:

  • EPIDs were configured as dosimeters to evaluate MLC leaf positioning accuracy across various gantry and collimator angles.
  • The system's response linearity and dynamic range were assessed.

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  • In vivo exit dosimetry was performed and compared against traditional dosimeters like silicon diodes and ion chambers.

    • Main Results:

    • EPID-based dosimetry demonstrated a linear response with a good dynamic range.
    • MLC leaf positioning was found to be reproducible within 0.5 mm for all tested angles.
    • Preliminary results indicated that exit doses could be determined within 2.5% accuracy compared to standard dosimetry methods under specific conditions.

    Conclusions:

    • EPIDs offer versatile capabilities for advanced radiotherapy quality assurance, including MLC performance assessment and in vivo dosimetry.
    • These findings support the expanded use of EPIDs to enhance the precision and safety of radiation delivery.
    • Further research can optimize EPID dosimetry for routine clinical application in radiotherapy.