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Author Spotlight: Enhancing Diagnostic Strategies and Biomarker Development for Comprehensive Lung Function Analysis

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SU-E-T-189: Arc Splitting for VMAT Patient QA.

J Sweet¹, N Nicolaou¹

¹Urologic Consultants of Southeastern Pennsylvania, Bala Cynwyd, PA.

Medical Physics

|May 19, 2017

Summary

This summary is machine-generated.

Splitting VMAT arcs for prostate cancer quality assurance did not reveal any hidden failures. This study found that partial arc verification is a reliable method for ensuring treatment accuracy.

Keywords:

Computer software Quality assurance

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Area of Science:

Medical Physics
Radiation Oncology
Quality Assurance

Background:

VMAT (Volumetric Modulated Arc Therapy) verification plans previously mirrored clinical plans.
Full arcs delivered en face to QA devices may mask dose cancellations.
Eclipse v10.0 enables splitting clinical arcs into subdivisions for verification.

Purpose of the Study:

To assess the necessity of arc splitting for VMAT prostate patient quality assurance.
To investigate potential dose cancellations masked by full arc delivery.

Main Methods:

Twelve VMAT prostate patient plans were analyzed.
Verification plans included two full arcs, 8 partial arcs (90° each), and 16 partial arcs (45° each).
Analysis used 3%/3mm criteria with a 10% threshold and 95% passing points.

Main Results:

Out of 49,670 points analyzed across 288 partial arcs, only 0.2% failed the 3%/3mm criteria.
No arcs failed the 95% passing criteria.
No evidence of dose cancellation was observed between partial arcs.

Conclusions:

Splitting full arcs into partial arcs for VMAT prostate QA did not uncover previously unseen failures.
Partial arc verification is a valid method for quality assurance in VMAT prostate treatments.