目的 通过跟踪Varian Millennium-多页准直器(Multi-Leaf Collimator,MLC)导槽镀膜升级前后叶片驱动电机PWM值以及MLC故障次数,对比分析镀膜升级前后MLC的性能变化.方法 对一台多页准直器导槽镀膜升级,分别记录和分析升级前后的各叶片驱动电机的PWM值和升级前后半年的MLC故障次数.结果 A面平均PWM值下降13%,B面平均PWM值下降9.7%,PWM最大值在8~10之间的叶片增加30%,且升级后无PWM最大值大于16的叶片;半年比较发现MLC故障次数下降61.5%.结论 对多页准直器导槽镀膜升级可以有效减少叶片运动阻力,进而减少MLC故障频率,从而达到减少治疗过程中停机时间的目的.%Objective To analyze the change of performance of Varian Millennium-MLC before and after lubricant filming, including the PWM of each leaf's driving motor and failures. Methods Lubricant filming was performed on a Millennium-MLC carriage, PWM of each leaf's motor was tested and recorded before and after lubricant filming. failure frequency of six months for multi-leaf collimator before and after lubricant filming was collected. Results The average PWM of all leaves decreased 13% and 9.7% for side A and side B, respectively. Number of leaves which maximum PWM between 8 and 10 increased 30%, and none of them exceed 16. Six months failures decreased 61.5%. Conclusion Lubricant filming on Millennium-MLC reduces movement friction of leaves and MLC failures significantly. Therefore, the purpose of reducing downtime during treatment is achieved.
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