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Tracking Trends of TG-142 Parameters Via Analysis of Data Recorded by 2D Chamber Array

A Alexandrian

A Alexandrian*, C Kabat , D Defoor , D Saenz , K Rasmussen , N Kirby , A Gutierrez , N Papanikolaou , S Stathakis , University of Texas HSC SA, San Antonio, TX


SU-F-T-458 (Sunday, July 31, 2016) 3:00 PM - 6:00 PM Room: Exhibit Hall

With increasing QA demands of medical physicists in clinical radiation oncology, the need for an effective method of tracking clinical data has become paramount. A tool was produced which scans through data automatically recorded by a 2D chamber array and extracts relevant information recommended by TG-142. Using this extracted information a timely and comprehensive analysis of QA parameters can be easily performed enabling efficient monthly checks on multiple linear accelerators simultaneously.

A PTW STARCHECK chamber array was used to record several months of beam outputs from two Varian 2100 series linear accelerators and a Varian NovalisTx™. In conjunction with the chamber array, a beam quality phantom was used to simultaneously to determine beam quality. A minimalist GUI was created in MatLab that allows a user to set the file path of the data for each modality to be analyzed. These file paths are recorded to a MatLab structure and then subsequently accessed by a script written in Python (version 3.5.1) which then extracts values required to perform monthly checks as outlined by recommendations from TG-142. The script incorporates calculations to determine if the values recorded by the chamber array fall within an acceptable threshold.

Values obtained by the script are written to a spreadsheet where results can be easily viewed and annotated with a “pass" or “fail” and saved for further analysis. In addition to creating a new scheme for reviewing monthly checks, this application allows for able to succinctly store data for follow up analysis.

By utilizing this tool, parameters recommended by TG-142 for multiple linear accelerators can be rapidly obtained and analyzed which can be used for evaluation of monthly checks.

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