南通市三家医院2022年度多排螺旋CT质量控制评价及分析

Evaluation and analysis on quality control of multi-slice CT in three hospitals of Nantong City in 2022

目的 了解南通市三家医院2022年度多排螺旋CT(multi-slice CT,MSCT)质量控制检测现状,分析存在的问题并提出解决方法。方法 按照相关标准对抽取的南通市三家医院2022年医用MSCT设备进行检测和评价,共涉及78台MSCT设备。检测条件为管电压120 kV,管电流140 mA,扫描时间1 s,10 mm或8 mm层厚,剂量值<50 mGy,检测项目包括外观检测、功能检测、图像质量检测。统计分析MSCT分布情况,以及诊断床定位精度、层厚偏差、均匀性、噪声、空间分辨率、低对比分辨力、高对比分辨力、CT剂量指数、水的CT值的合格率。结果 此次研究纳入78台MSCT,有60台(76.92%)全部检测指标均合格,其他MSCT均有一项或几项指标不合格。不同厂家之间合格率差异无统计学意义(P>0.05),而出厂时间、医院级别、二手MSCT与合格率相关,其中≥10年、二级医院以及二手MSCT的合格率较低(P<0.05)。MSCT外观检测(电缆、电源接口、各部件结构等)、功能检测(墙上紧急关机按钮、隔室对话设备、诊断床的移动功能等)结果显示各项指标合格率均高于85%。MSCT质量控制检测结果显示,均匀性、噪声、CT剂量指数合格率偏低,分别为79.49%、78.21%、78.21%,诊断床定位精度、层厚偏差等质量控制检测合格率均高于85%。结论 医疗机构需要对医用MSCT进行质量控制检测,做好维护、保养、质量监督工作,有助于设备的稳定运行。

Objective To understand the status quo of multi-slice CT(MSCT) quality control testing in three hospitals of Nantong City in 2022,analyze existing problems and propose solutions.Methods A total of 78 medical MSCT devices were tested and evaluated in 2022 in three hospitals in Nantong City according to relevant standards.The detection conditions included a tube voltage of 120 kV,a tube current of 140 mA,a scanning time of 1 s,a layer thickness of 10 mm or 8 mm,and a dose value of <50 mGy.The detection items included appearance inspection,functional inspection,and image quality inspection.The MSCT distribution was analyzed statistically,and the qualified rate of positioning accuracy,thickness deviation,uniformity,noise,spatial resolution,low contrast resolution,high contrast resolution,CT dose index and water CT value of the diagnostic bed were compared.Results Of the 78 MSCTs included in this study,60 MSCTs(76.92%) were qualified in all the test indicators,and the other MSCTs were unqualified in one or several indicators.There was no significant difference in the qualified rate among different manufacturers(P>0.05),while the delivery time,hospital level and second-hand MSCTs were correlated with the qualified rate,among which the qualified rate of ≥10 years,secondary hospitals and second-hand MSCTs were lower(P<0.05).MSCT appearance test(cable,power interface,structure of each component,etc.),function test(wall emergency shutdown button,compartment dialogue device,movement function of diagnostic bed,etc.) results showed that the qualified rate of each index was higher than 85%.The results of MSCT quality control test showed that the qualified rates of uniformity,noise and CT dose index were 79.49%,78.21% and 78.21%,respectively,and the qualified rates of diagnostic bed positioning accuracy and layer thickness deviation were all higher than 85%.Conclusions Medical institutions need to conduct quality control testing on medical MSCTs,and do a good job in maintenance and quality supervision,which is conducive to the stable operation of the equipment.