Abstract
Purpose:Two aims of this work were to develop a method to automatically verify treatment delivery accuracy immediately after patient treatment and to develop a comprehensive daily treatment report to provide all required information for daily MR‐IGRT review.Methods:After systematically analyzing the requirements for treatment delivery verification and understanding the available information from a novel MR‐IGRT treatment machine, we designed a method to use 1) treatment plan files, 2) delivery log files, and 3) dosimetric calibration information to verify the accuracy and completeness of daily treatment deliveries. The method verifies the correctness of delivered treatment plans and beams, beam segments, and for each segment, the beam‐on time and MLC leaf positions. Composite primary fluence maps are calculated from the MLC leaf positions and the beam‐on time. Error statistics are calculated on the fluence difference maps between the plan and the delivery. We also designed the daily treatment delivery report by including all required information for MR‐IGRT and physics weekly review – the plan and treatment fraction information, dose verification information, daily patient setup screen captures, and the treatment delivery verification results.Results:The parameters in the log files (e.g. MLC positions) were independently verified and deemed accurate and trustable. A computer program was developed to implement the automatic delivery verification and daily report generation. The program was tested and clinically commissioned with sufficient IMRT and 3D treatment delivery data. The final version has been integrated into a commercial MR‐IGRT treatment delivery system.Conclusion:A method was developed to automatically verify MR‐IGRT treatment deliveries and generate daily treatment reports. Already in clinical use since December 2013, the system is able to facilitate delivery error detection, and expedite physician daily IGRT review and physicist weekly chart review.
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