磁共振成像设备低对比度分辨力影响因素的分析研究  

Analysis and Research on the Factors influencing the Low Contrast Resolution of MRI Equipment

作　　者：熊晖 付丽媛[1] 钟群[1] 肖慧[1] 许尚文[1] 陈自谦[1] XIONG Hui;FU Liyuan;ZHONG Qun;XIAO Hui;XU Shangwen;CHEN Ziqian(Department of Radiology,900^th Hospital of Joint Logistics Support Force(Formerly Fuzhou General Hospital of Nanjing Military Region),Fuzhou Fujian 350025,China)

机构地区：[1]联勤保障部队第900医院(原南京军区福州总医院)放射诊断科,福建福州350025

出　　处：《中国医疗设备》2020年第11期16-18,26,共4页China Medical Devices

基　　金：国家重点研发计划数字诊疗装备研发重点专项子课题(2016YFC0103103);军区重大课题(14ZX23);医院科研计划(2019Q02)。

摘　　要：本文对磁共振成像系统低对比度分辨力检测过程中的影响因素展开研究,我们将其作为变量采用自旋回波序列扫描ACR体模,在得到的检测层面上测量低对比度分辨力。通过分析各类因子的形成过程和原理,并在处理图像数据后对实验结果进行比较可以发现,层面定位的准确性影响了低对比度分辨力模块的显示,造成检测值的降低,而伪影的存在及扫描参数的改变也将给结果带来不同程度的误差。能够改变结果的因素有很多,工作人员在检测时需要依据问题产生的原因对症下药,对空间位置的准确度和成像过程的参数选择进行校准,保证检测结果的真实性和有效性。在出现结果偏差较大的情况时应格外注重排除其带来的影响,并可借此为依据规划专机专用的检测标准及误差范围,为建立周期性图像质量控制检测的基准曲线和漂移程度标准提供理论依据,从而确保系统时间性能曲线的有效性,帮助维持设备稳定运行。This paper is going to research the influencing factors in the process of low contrast resolution detection of MRI system.We took them as variables,scaned ACR phantom with spin echo sequence,and measured the low contrast resolution at the detection slices.By analyzing the formation process and principle of various factors,and comparing the experimental results after processing the image data,it can be found that the accuracy of layer positioning affects the display of low contrast resolution module,resulting in the decrease of detection value,and the existence of artifacts and the change of scanning parameters will also bring different degrees of error to the results.There are many factors that can change the results,when testing,the staff need to find the right medicine according to the causes of the problem,calibrate the accuracy of the spatial position and the parameter selection of the imaging process to ensure the authenticity and effectiveness of the detection results.While the result deviation is large,we should pay special attention to eliminate the influence.We can provide theoretical basis for the establishment of the reference curve and drift degree standard of periodic image quality control detection according to the special detection standard and error range of planning special MRI system,so as to ensure the effectiveness of the system time performance curve and help maintain the stable operation of the equipment.

关 键 词：磁共振成像系统 质量控制检测 低对比度分辨力 影响因素 基准曲线 

分 类 号：R197.3[医药卫生—卫生事业管理] TH774[医药卫生—公共卫生与预防医学]