Study of establishment of evaluation index system for stability of linac equipment / 中华放射肿瘤学杂志

ABSTRACT

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, 9 second-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.