摘要
Abstract
Objective To apply statistical method and statistical process control to quality management on uniformity of CT image data,which was aimed at improving the quality of CT images and better providing more clear CT images for patients of tumor radiotherapy (RT).Methods The uniformity of simulating location CT device for tumor RT in our hospital was detected,and the adopted detection method was referred to verification method for uniformity of CT images,which was described in Verification Regulation of Medical Diagnostic X-ray Radiation Source for Spiral CT (JJG 1026-2007 of National Metrology Verification Regulation of PRC).Then the data gained from detection above were tested and disposed through the control strategy of statistical process so as to implement a control chart drawing.Results The control chart showed that uniformity of CT image data,which were obtained on the operating machine from the time after warm-up to the time before heat dissipation,accorded with normal distribution curve.Besides,under the fixed tube voltage (same kV value),uniformity of CT images was relatively stable when tube current was about 200 mA.In the other hand,uniformity of CT images was relatively stable if tube voltage was around 130 kV in view of the same tube current.Conclusion The technician,who operated simulating location CT device for tumor RT in our hospital,was advised firstly to do no-load operation once after the warm-up,secondly to maintain operation parameters of CT device at 200 mA,130 kV more or less,keeping the CT image uniformity at a good state.In addition,the ambient temperature in CT device room should be set suitable.关键词
CT模拟定位机/图像均匀性/肿瘤放疗/统计学方法/X射线辐射源Key words
simulating location CT device/image uniformity/tumor radiotherapy/statistical method/X-ray radiation source分类
医药卫生
