What is it about?

An in-house trajectory log analysis program (LOGQA) was developed to evaluate the delivery accuracy of volumetric-modulated arc therapy (VMAT) for stereotactic body radiation therapy (SBRT). Methods have been established in LOGQA to provide analysis on dose indices, gantry angles, and multi-leaf collimator (MLC) positions. Three types of intentional errors were introduced to patient plan for the differentiation of log file-based quality assurance (QA) from traditional phantom measurement.

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Why is it important?

Machine log analysis provides crucial information on VMAT SBRT plan delivery. End-to-end plan transfer and beam parameters accuracy check using log files provides a robust and reliable QA method to reduce patient-specific QA measurement, provided that a comprehensive measurement-based machine-specific QA program is in place.


I hope this article would help people understand the pros and cons of using log files for patient-specific QA and the importance of comprehensive QA program to safeguard the quality of treatment plans.

Uen Yan Chow

Read the Original

This page is a summary of: Patient‐specific quality assurance using machine log files analysis for stereotactic body radiation therapy (SBRT), Journal of Applied Clinical Medical Physics, October 2020, Wiley,
DOI: 10.1002/acm2.13053.
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