An investigation of using log‐file analysis for automated patient‐specific quality assurance in MRgRT

Abstract

Objective: Adaptive radiation therapy (ART) is an integral part of MR-guided RT (MRgRT), requiring a new RT plan for each treatment fraction and resulting in a significant increase in patient-specific quality assurance (PSQA). This study investigates the possibility of using treatment log-file for automated PSQA.Method: All treatment plans were delivered in 1.5T Unity MR-Linac (Elekta).A Unity compatible version of LinacView (Standard Imaging) was commissioned to automatically monitor and analyze the log-files. A total of 220 fields were delivered and measured by ArcCheck ® -MR (Sun Nuclear) and LinacView.Thirty incorrectly matched fields were also delivered to check for error detection sensitivity. The gamma analysis, γ, with 3%, 3 mm criteria was used in both ArcCheck ® -MR and LinacView. Additionally, the gantry angle, jaws, and multileaf collimators (MLC) positions reported in the log-file were compared with plan positions using TG-142 criteria. Result:The γ (3%, 3 mm) for the 190 plans were found to be between the range of 72.5%-100.0% and 95.4%-100.0% for ArcCheck ® -MR and LinacVeiw, respectively. All the delivered gantry angle and jaws were found to be within 0.2° and 2 mm. MLCs that were outside the guard leaves or under the diaphragms were found to have more than 1.0 mm discrepancy. This was attributed to the linac internal override for these MLCs and had no dosimetric impact. Excluding these discrepancies, all MLC positions were found to be within 1.0 mm. The γ (3%, 3 mm) for the 30 incorrectly matched fields were found to be 3.9%-84.8% and 0.1%-64.4% for ArcCheck ® -MR and LinacVeiw, respectively. Conclusion:Significant ranked correlation demonstrates the automated log-file analysis can be used for PSQA and expedite the ART workflow. Ongoing PSQA will be compared with log-file analysis to investigate the longer term reproducibility and correlation.

Commissioning measurements on an Elekta Unity MR-Linac

“…Segment-by-segment delivery of these stereotactic plans, to the MVI, would also be useful to help discern issues with field shapes, as shown above. Note that an alternate method for detecting such issues would be through analysis of the auto-generated treatment record files (TRFs) [ 37 , 38 ]. Comparison of set leaf positions in the TPS could be compared against delivered position in TRFs, to highlight the errors discovered in this work.…”

Integration of an Independent Monitor Unit Check for High-Magnetic-Field MR-Guided Radiation Therapy System

“…The IMU check is just one component of our patient-specific QA (PSQA) program in MR-guided RT ( 14 ). The IMU check used the same MUs from the Monaco plans as the input to the independent dose calculation and performed the QA check by comparing the dose distribution calculated with the two algorithms.…”

“…Gamma analysis of the measurements was first generated by comparing them with the dose calculation from Monaco. They were then correlated with the results from IMU with contingency analysis ( 14 ). The passing criteria were set at 95%.…”

Adaptive Radiotherapy: Next-Generation Radiotherapy

“…Real-time treatment delivery monitoring has been investigated as a substitute for pretreatment QA. Analysis conducted using machine log files on the 1.5 T MR-LINAC system has demonstrated a significant association with measurement-based QA, providing a high level of sensitivity in detecting errors [ 27 ]. The integration of machine log data and cine images has the potential to enable the reconstruction of the absorbed dose that was provided, while taking into consideration any motion that occurred during the treatment [ 28 ].…”