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SU-E-T-171: Missing Dose in Integrated EPID Images.

B King1,2, E Seymour1,2, K Nitschke1,2

  • 1University of Newcastle, Newcastle, NSW, AU.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

A dosimetric artifact in Varian Electronic Portal Imaging Devices (EPIDs) during beam interrupts was identified. Adding an extra frame to image acquisition resolves this, improving EPID reliability for radiation therapy dosimetry.

Keywords:
Computer systemsDosimetryImage guided radiation therapyIntensity modulated radiation therapyMedical image artifactsMedical imaging

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Imaging Technology

Background:

  • Varian Electronic Portal Imaging Devices (EPIDs) are crucial for radiation therapy quality assurance.
  • Observed dosimetric artifacts with Varian EPIDs necessitate investigation into their root cause and clinical significance.

Purpose of the Study:

  • To determine the root cause of a dosimetric artifact observed in Varian EPIDs when beam interrupts occur.
  • To assess the clinical significance of this artifact on radiation dose monitoring.

Main Methods:

  • Acquired integrated mode EPID images with and without manual beam interrupts for IMRT fields.
  • Captured individual frames using a frame-grabber system for precise synchronization.
  • Compared interrupt and non-interrupt images to evaluate EPID performance during beam interruptions.

Main Results:

  • Interrupted images showed non-uniform discrepancies greater than 5% in the leaf regions.
  • A small, random amount of dose was consistently lost at the end of each exposure.
  • Including an additional frame in image acquisition reduced discrepancies to 1% or less.

Conclusions:

  • Integrated EPID imaging can lose dose at beam termination due to random timing within a frame.
  • Adding an extra frame to image acquisition effectively corrects this dosimetric artifact.
  • This correction enhances EPID suitability for clinical dosimetry applications.