(Sunday, 7/12/2020) [Eastern Time (GMT-4)]
Room: AAPM ePoster Library
Purpose: With more technologies in radiation oncology rapidly becoming more advanced, the usage of generated log file data has become an important access point for quick checks and overall performance reviews. However, some technologies can produce multiple sets of log data, with each detailing information differently. The Elekta Versa HD can produce two datasets that define the machine parameters during delivery, the iCOM system, and the ‘.trf’ log files. Each provides meaningful results that can be used for QA or radiation delivery analysis, but how each compares against the other is unknown. It is the purpose of this study to review how to output data between the iCom service and machine-generated ‘.trf’ log files compare.
Methods: A set of patient plans were delivered on an Elekta Versa HD linac while the iCOMCat software recorded each segment of the delivery. Automatically generated logfiles from the deliveries were exported from the system, and both sets of files were converted into fluences using in house MATLAB scripts. Fluences were compared using a global difference.
Results: Fluence differences within the delivery field were found to range up to 15 MU, with the majority being within 5 MU. On average, 93.3% of the calculated fluence was found to be within 2.5% difference between the iCom and ‘.trf’ files based on the global dose. This value was found to reduce to 88.04% passing when reducing the criteria to 2.0%.
Conclusion: Data derived from this study demonstrates that there is a difference in using higher-resolution files. If a higher account of the performance of the Elekta Versa HD linac is needed the ‘.trf’ log files are suggested, having on average five times more data points than iCOM files. The clinical impact of these differences will be studied by calculating the dose to the patient using both methods.
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