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Poster - Thur Eve - 71: Improved dose accuracy for plan checking IMRT breast plans.

R Corns1, S Thomas1, P Dubrowski2

  • 1BC Cancer Agency - Fraser Valley Centre, Surrey, BC.

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|May 19, 2017
PubMed
Summary

Dose verification software (IMSure QA) showed discrepancies for IMRT breast tangents. Corrections for air flash and tissue heterogeneity significantly improved dose accuracy, achieving results comparable to treatment planning systems.

Keywords:
CancerEclipsesField sizeIntensity modulated radiation therapyTissues

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Quality Assurance

Background:

  • Dose verification is crucial for patient safety in radiotherapy.
  • The IMSure QA platform is used for dose verification of Intensity-Modulated Radiation Therapy (IMRT) plans.
  • Discrepancies were observed between Eclipse (treatment planning) and IMSure QA for IMRT breast tangents.

Purpose of the Study:

  • To investigate and correct dose discrepancies in IMRT breast tangent plans identified during QA.
  • To develop and evaluate correction factors for air flash and tissue heterogeneity in IMSure QA.
  • To improve the accuracy of dose verification for IMRT breast tangents.

Main Methods:

  • Developed an air-flash-correction factor using ratios of TMRs and Phantom Scatter Factors.
  • Implemented a method to replace IMSure's heterogeneity correction with an Anisotropic Analytical Algorithm (AAA)-based factor.
  • Evaluated correction factors on 8 patients (32 fields) using ANOVA to compare with Eclipse dose values.

Main Results:

  • The combination of air-flash correction and IMSure's inherent heterogeneity correction reduced the mean dose difference from -3% to 0.3%.
  • Applying an AAA-based heterogeneity correction alone improved accuracy, reducing the mean difference to -1.5%.
  • Both correction methods demonstrated improved dose accuracy for IMRT breast tangents.

Conclusions:

  • The developed air-flash correction factor, combined with IMSure's existing heterogeneity correction, significantly enhances dose verification accuracy for IMRT breast tangents.
  • AAA-based heterogeneity correction offers an acceptable alternative for improving IMSure QA accuracy in this context.
  • These corrections are vital for reliable plan checking and ensuring high-quality patient care in radiotherapy.