摘要
目的:观察4种金属铸造冠磁共振成像(MRI)检查时所产生金属伪影。方法:给实验犬依次佩戴钴铬合金、低钛合金、镍铬合金、纯钛4种试验铸造冠(右上第二前磨牙),分别进行常规3.0 T 6个序列及1.5 T 4个序列磁共振头部扫描,测量4种铸造冠所产生的伪影的最大面积和伪影涉及图像的层数。结果:2种场强下钴铬合金铸造冠所产生的伪影面积最大(P<0.01);1.5 T场强下其他3种合金冠之间差异均无显著性(P>0.05);3.0 T场强下镍铬合金冠伪影大于低钛合金冠和纯钛冠(P<0.05);低钛合金冠与纯钛冠差异无显著性(P>0.05)。在2种场强下和全部扫描序列中,伪影涉及的图像层数均以钴铬合金冠的最多,纯钛金属冠最少,其余2种合金冠相同。结论:钴铬合金伪影程度最大,镍铬合金和低钛合金次之,纯钛在4种金属中伪影程度最小。
Objective：To observe the artifacts produced by dental metal crown made from different materials on magnetic resonance imaging （MRI）.Methods：Mental crows made from Co-Gr,Ni-Gr,low-Ti alloy and Pure-Ti were respectively fabricated for upper right second premolar of a ripe crossbreed dog.The 4 different casting crowns were respectively put on experimental tooth and head MRI scan was carried out with 4 sequences of 1.5 T and 6 sequences of 3.0 T MRI respectively.The existence and extent of the artifacts were assessed and compared.Results：On both 1.5 T and 3.0 T MRI,the Go-Gr alloy crown exhibited significantly wider artifacts than the others （ANAVO analysis,P〈0.01）.There were no significant differences among Ni-Gr,low-Ti alloy and Pure-Ti on 1.5 T MRI（P〉0.05）.On 3.0 T MRI the artifacts produced by Ni-Gr was larger than that by low-Ti alloy or Pure-Ti（P〈0.05,between low-Ti alloy and pure-Ti,P〉0.05）.By any of the test sequence either on 1.5 T or on 3.0 T,the Co-Gr alloy produced artifacts in the most slices of MRI imaging and Pure-Ti in the least.Conclusion：Go-Gr alloy may produce larger artifacts than Ni-Gr, low-Ti alloy and Pure-Ti on MRI.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2014年第4期472-476,共5页
Journal of Practical Stomatology
基金
河北省卫生厅科研攻关计划(编号:08115)
关键词
伪影
金属伪影
齿科合金
磁共振成像(MRI)
Artifacts
Metallic artifacts
Dental casting alloy
Magnetic resonance imaging（ MRI）
