金属假牙对头部磁共振成像的影响及其处理方法(1)
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[摘要] 目的 探讨金属假牙对头部磁共振成像(MRI)图像质量的影响以及应用Propeller技术(螺旋桨技术或刀锋技术)消除或减轻金属假牙所致的磁敏感伪影。 方法 采用GE Signa HDe 1.5T磁共振机对77例头痛查因且口腔有固定金属假牙的患者行头部MRI检查，并对采用Propeller技术前后的结果进行比较。 结果 77例全部应用Propeller技术后有76例金属伪影消除，另有1例只能减轻其伪影仍不能消除，消除率达98.70%。 结论 应用Propeller技术后口腔固定金属假牙所产生的磁敏感伪影(金属伪影)已消除或明显减轻，可以达到临床诊断要求。
[关键词] 磁共振成像；磁敏感伪影；Propeller技术
[中图分类号] R445.2 [文献标识码] B [文章编号] 1673-7210(2012)08(a)-0104-02
Effection and treatment of metal dentures on head magnetic resonance imaging (MRI) treatment
DENG Chengjian HE Weihong FAN Kun HU Kai
Department of Radiology, the Second Affiliated Hospital of South China University, Hu′nan Province, Hengyang 421001, China
[Abstract] Objective To investigate the effect of Metal denture on the image of the head MRI and ease magnetic susceptibility caused by artifact metal dentures by taking on the Propeller technology. Methods 77 cases with oral fixed metal dentures were checked on head by the GE Signa HDe 1.5T MR machine, and the results were analysed before and after taking on the Propeller technology. Results After the application of Propeller technology on the 77 cases, the metal artifacts of 76 cases were eliminated, one case was only eased, the elimination rate was 98.70%. Conclusion The Propeller technology can eliminate or significantly reduce the magnetic susceptibility artifact (metal artifact) on the patients of oral fixation of metal dentures
[Key words] Magnetic resonance imaging; Magnetic susceptibility artifact; Propeller technology
随着医疗技术的飞速发展以及人们的健康、安全意识的不断提高，磁共振检查越来越多的被人们所接受，它是利用人体原子核在磁场内与外加射频脉冲发生共振而产生影像的一种新成像技术，它既能显示形态结构，又能反映某些器官的功能状况，以及无创性、无辐射等优点，已广泛应用于临床。但是，在磁共振检查过程中，患者随身携带的金属会对图像产生严重的干扰，而达不到诊断要求 ......
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