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Gantry-angle resolved VMAT pretreatment verification using EPID image prediction.

Henry C Woodruff¹, Todsaporn Fuangrod, Pejman Rowshanfarzad

¹School of Mathematical and Physical Sciences, The University of Newcastle, NSW 2308, Australia. Henry.Woodruff@newcastle.edu.au

Medical Physics

|August 10, 2013

Summary

This study introduces a novel gantry-angle-resolved method for verifying volumetric modulated arc therapy (VMAT) dose delivery using electronic portal imaging devices (EPID). The new technique enhances pretreatment accuracy for radiation therapy.

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Area of Science:

Medical Physics
Radiation Oncology

Background:

Pretreatment verification of volumetric modulated arc therapy (VMAT) is crucial for accurate radiation delivery.
Current methods often integrate dose information over large segments, potentially missing angle-specific deviations.

Purpose of the Study:

To develop and evaluate a novel gantry-angle-resolved method for VMAT dose delivery verification using an electronic portal imaging device (EPID).
To assess the accuracy and efficiency of this new verification technique.

Main Methods:

A VMAT dose prediction model was employed to generate EPID images as a function of gantry angle for prostate cancer patients.
EPID image frames were acquired at high frame rates and synchronized with gantry angle information encoded in kV frames.
Gamma analysis was performed on gantry-angle-resolved data, integrating frames over small subarcs (2°) with specific angle-to-agreement tolerances.

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Main Results:

The gantry-angle-resolved method demonstrated high accuracy, with Gamma pass-rates exceeding 90% for 3%/3mm criteria in most cases (average 97.3%).
The accuracy of kV-derived gantry angles was high (0.1° 1 SD), and the mean gantry angle lag was minimal (0.3°±0.3°).
The model showed strong agreement with integrated EPID images, achieving 99.7% Gamma pass-rates (2%/2mm).

Conclusions:

The developed method offers a comprehensive and efficient approach for pretreatment VMAT verification using EPID.
Gantry-angle-resolved dose delivery accuracy assessment ensures precise radiation treatments.