直线加速器设备稳定性评价指标体系建构研究

Study of establishment of evaluation index system for stability of linac equipment

目的构建直线加速器稳定性评价指标体系,建立科学、系统、客观评价其稳定性量化标准。方法基于Delphi法和AHP法构建直线加速器设备稳定性3级指标体系,运用Microsoft Excel2007和SPSS 16.0计算相关系数和权重。结果两轮专家积极性分别为85%(17/20)和92%(23/25),专家权威系数分别为0.79和0.87。专家Kendall协调系数1、2、3级指标分别为0.957(P<0.05)、0.637(P<0.05)和0.527(P<0.05)。最终确立涵盖机械治疗系统和附件系统2个1级指标,9个2级指标和32个3级指标的多层级指标体系,各级指标的CV均<0.25且通过一致性检验。结论直线加速器设备稳定性评价指标体系具备良好的科学性、可操作性和通用性,可为直线加速器稳定性评价和购置设备提供理论和量化参考。

Objective To build an evaluation index system for linac stability and establish a scientific,systematic and Objective evaluation standard for the stability of linac equipment.Methods Based on the Delphi and AHP methods,a three-level index system for the stability of linac equipment was established,and the correlation coefficients and weights were calculated using Microsoft Excel 2007 and SPSS 16.0.Results The enthusiasm of experts in two rounds was 85%(17/20)and 92%(23/25),the authority coefficients were 0.79 and 0.87,and the expert Kendall coordination coefficients were 0.957(first-level index,P<0.05),0.637(second-level index,P<0.05)and 0.527(third-level index,P<0.05),respectively.Finally,a three-level index system covering 2 first-level indicators of mechanical treatment system and accessory system,9second-level indicators and 32 third-level indicators was established.The CVs of all levels of indicators were less than 0.25 and passed the consistency test.Conclusion The evaluation index system for linac equipment stability has good scientificity,operability and versatility,which can provide theoretical and quantitative reference for linac stability evaluation and equipment purchase.