Application of TG100 report in process quality control of intensity-modulated radiotherapy / 中华放射肿瘤学杂志

ABSTRACT

Objective:To analyze the intensity-modulated radiotherapy (IMRT) process based on the TG100 report, aiming to improve the quality control method and guarantee the safety and quality of IMRT.Methods:Based on the TG100 report, a risk analysis team was established. The flow chart of overall and each sub-step of IMRT was constructed. The failure mode and effect analysis method were adopted to determine all potential error modes in the process. The probability of of the error mode, the probability of being checked out and the severity of the effect of the error mode on the clinical bed were evaluated based on the pre-set scoring standard. The priority value of each error mode was calculated and ranked from high to low priority value. The top 20% is defined as the high-risk error mode, which was analyzed by error tree to improve the quality control method.Results:IMRT consisted of 11 main steps and 41 sub-steps, and 180 failure modes were detected. The priority values were ranged from 30 to 178. A total of 36 high-risk failure modes were found. The top 5 high-risk failure modes (RPN) consisted of setup error (178), electronic portal imaging device (EPID) registration (172), contouring error (166), treatment delivery error (160) and prescription dose error (156).Conclusion:TG100 report is practical and convenient to utilize, which can effectively and systematically improve IMRT process and provide safety and quality assurance of IMRT process.