Interpretation of intrafraction motion review data and method for verification

Area of Science:

• Medical Physics
• Radiation Oncology
• Image Analysis

Background:

• Current Varian intrafraction motion review (IMR) offers limited qualitative data at the treatment console.
• Quantitative analysis of intrafraction motion is crucial for treatment accuracy and quality improvement.

Purpose of the Study:

• To develop a method for extracting and interpreting quantitative data from combined log files for intrafraction motion review.
• To enable retrospective analysis of intrafraction motion using log file data.

Main Methods:

• Developed a parsing code to scan Varian combined log files for specific data.
• Extracted key parameters including gantry angle, marker positions, and detection results.
• Compared intrafraction motion review (IMR) data with Calypso for dual-surrogate monitoring.

Main Results:

• Successfully extracted clinically relevant quantitative parameters from combined log files.
• Established a method for dual-surrogate intrafraction monitoring by comparing IMR and Calypso data.
• Demonstrated the feasibility of quantitative intrafraction motion analysis from treatment logs.

Conclusions:

• Quantitative analysis of intrafraction motion is achievable using combined log files.
• This method enhances the review of intrafraction motion, aiding quality improvement in patient care.
• Provides a foundation for further research in intrafraction motion monitoring and analysis.