80例常规颅脑MRI伪影分析  

Analysis of 80 Artifacts in Brain MRI Examinations

作　　者：丁金立 段云云 刘亚欧 卓芝政 范亦龙[1] 郑凤莲 谢聪 DING Jinli;DUAN Yunyun;LIU Yaou;ZHUO Zhizheng;FAN Yilong;ZHENG Fenglian;XIE Cong(Department of Radiology,Beijing Tiantan Hospital Affiliated to Capital Medical University,Beijing 100070,China)

机构地区：[1]首都医科大学附属北京天坛医院放射科,北京100070

出　　处：《中国医疗设备》2020年第8期75-78,共4页China Medical Devices

摘　　要：目的分析颅脑MRI扫描时所产生伪影的类型及原因,选择合适的方法消除或减少伪影,以提高颅脑MRI扫描的图像质量。方法回顾性收集80例颅脑MRI扫描时产生伪影的图像并归类,统计不同类型伪影的例数,分析可能原因,采用合理方法消除或减少伪影。结果所收集的80例颅脑MRI伪影分为设备伪影、患者伪影和外源性伪影三大类,其中设备伪影8例(包括线圈故障2例,卷褶伪影6例),患者伪影52例(包括自主运动伪影24例,血管搏动伪影15例,植入器械伪影13例),外源性伪影20例(包括射频干扰12例,外源性辅助装置伪影7例、呕吐物所致伪影1例)。结论行颅脑MR扫描时,多种因素易导致图像产生伪影,选择合理的方法,可避免或减少颅脑MR扫描时伪影的产生;修正合理的扫描参数及定期维护以及患者的良好配合均有助于避免和消除设备伪影、改善运动伪影。Objective To analyze the types and causes of artifacts in brain MRI scanning,and select appropriate methods to eliminate or reduce artifacts,so as to improve the image quality of brain MRI scanning.Methods Totally 80 patients,who underwent brain MRI in our hospital,were enrolled into this study.The number of cases of different types of artifacts were counted,the possible causes of artifacts were analyzed,and the artifacts were eliminated or reduced by reasonable methods.Results All the artifacts were classified into three categories:equipment related artifacts,patients related artifacts,and exogenous artifacts.There were 8 cases of equipment related artifacts,including 2 artifacts caused by coil malfunctions and 6 wraparound artifacts.There were 52 cases of patients related artifacts,including 24 patients’motion artifacts,15 vessel pulsation artifacts,and 13 implant artifacts,and there were 20 cases of exogenous artifacts,including 12 artifacts caused by radio-frequency interferences,7 artifacts caused by exogenous auxiliary devices and 1 artifact caused by patient’s vomitus.Conclusion Although many factors can easily lead to artifacts,reasonable methods can be used to avoid or reduce the artifacts.Moreover,the correction of reasonable scanning parameters,regular maintenance and good cooperation of patients can help to avoid or eliminate equipment artifacts and reduce motion artifacts.

关 键 词：核磁共振成像 颅脑成像 伪影 图像质量 磁共振设备 

分 类 号：R445.2[医药卫生—影像医学与核医学]