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A model-based 3D patient-specific pre-treatment QA method for VMAT using the EPID.

P M McCowan1,2, G Asuni2, T van Beek2

  • 1Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.

Physics in Medicine and Biology
|January 13, 2017
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Summary

This study presents a 3D dose reconstruction method using EPID images for quality assurance in Stereotactic Body Radiation Therapy-Volumetric Modulated Arc Therapy (SBRT-VMAT). The validated model accurately detects Multileaf Collimator (MLC) errors, enhancing treatment safety.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Quality Assurance

Background:

  • Pre-treatment quality assurance (QA) is crucial for radiotherapy accuracy.
  • Epidermal electronic portal imaging devices (EPID) offer potential for in-vivo dosimetry and QA.
  • Model-based dose reconstruction from EPID images can provide 3D dose estimates.

Purpose of the Study:

  • To develop and validate a model-based, 3D patient dose reconstruction method using EPID images for pre-treatment QA.
  • To assess the method's sensitivity to potential Multileaf Collimator (MLC) delivery errors.
  • To compare EPID-reconstructed doses with Treatment Planning System (TPS) predictions and ion chamber measurements.

Main Methods:

  • A back-projection dose reconstruction model processed cine-mode EPID images to estimate 3D dose on CT data.
  • Validation involved 24 Stereotactic Body Radiation Therapy-Volumetric Modulated Arc Therapy (SBRT-VMAT) plans.
  • Comparisons included ion chamber measurements, TPS predictions (AAA, AcurosXB), and dose distributions analyzed using gamma (γ) tests (3%/3mm, 2%/2mm).

Main Results:

  • EPID dose reconstruction showed good agreement with ion chamber measurements (average difference < 1.34%).
  • All plans passed EPID vs. AcurosXB and EPID vs. forward model γ-comparisons.
  • The method successfully detected MLC errors of ~1.0mm magnitude using a 3%/3mm γ-test, demonstrating sensitivity to delivery inaccuracies.

Conclusions:

  • The developed model-based 3D EPID dose reconstruction is a viable tool for pre-treatment QA in SBRT-VMAT.
  • The method effectively identifies MLC delivery errors, contributing to improved patient safety.
  • Further investigation with stricter criteria (2%/2mm γ-test) revealed enhanced detection capabilities for MLC errors.