种植体对磁共振成像影响的水模实验研究  

Experimental Study on Dental Implants Affecting Magnetic Resonance Imaging by Water Model Experiment.

作　　者：蔡锋[1] 陈方[2] 程志刚[1] 

机构地区：[1]华中科技大学同济医学院附属武汉中心医院,湖北武汉430014 [2]中科院武汉物理与数学研究所,湖北武汉430071

出　　处：《口腔医学研究》2017年第8期849-851,共3页Journal of Oral Science Research

摘　　要：目的:通过水模实验,前瞻性研究种植体对磁共振成像(Magnetic Resonance Imaging,MRI)检查的影响,对现有金属种植体的磁特性作出评价,以期给临床MRI检查提供实验依据,给医患双方对种植体的选择提供参考。方法:将不同品牌种植体置于水模上,用4.7T磁共振机进行扫描,观察种植体对MRI成像的影响。结果:种植体无投射效应,但对附近局部的MRI成像有影响,且不同品牌种植体产生的影响范围有很大的不同。自旋回波序列扫描产生的伪影明显小于梯度回波序列扫描产生的伪影。结论:金属种植体磁化率远远大于10-4,可归属为非常弱的铁磁性材料,对局部MRI成像有影响,但可安全进行MRI检查。Objective：To evaluate the magnetic properties of metal implants and provide experimental basis for clinical magnetic resonance imaging（MRI）examination and a reference for doctors and patients to choose implants by water model experiment.Methods：Different brands of implants were placed in a water model,which were scanned by a 4.7T magnetic resonance machine.Results：There were no missile effect for all implants,but there were local influences caused by implants differing in range depending on brands.The artifacts generated in the spin echo sequence scan were less significant than those generated in gradient echo sequence.Conclusion：The metal implants,whose magnetic susceptibility is much larger than 10^-4,can be treated as the very weak ferromagnetic material.Though they have local impacts on MRI,they can be safely present during MRI examination.

关 键 词：种植体 MRI伪影 水模 

分 类 号：R445.2[医药卫生—影像医学与核医学] R783.6[医药卫生—诊断学]