广西医学Issue(7)：888-890,899,4.DOI:10.11675/j.issn.0253-4304.2015.07.02
非铁磁性口腔金属材料磁共振成像伪影的实验研究
Exp erimental research on magneit c resonance imaging artifacts caused by non-ferroma gnetic dental metallic matre ials
摘要
Abstract
Objective To evaluate the artifact sizes of eight kinds of non -ferromagnetic dental metallic materials in three magnetic resonance imaging ( MRI ) sequences in order to provide experimental basis for choosing the optimum metallic materials and imaging sequences for MRI in clinical practice.Methods Cubical samples of eight kinds of dental metallic materials(amalgams,Ag-Pd alloy, Au-Pd alloy,three gold alloys(Au8:9 .5%,55.6%,150.%),titanium alloy and pure titanium) were fabricated and placed in a cylindrical plastic vessel filled with distilled water .Acrylic resin was used as control.All samples were imaged by means of MRI apparatus with three sequences,T1-weighted fast spin-echo(FSE-T1WI),T2-weighted fast spin-echo(FSE-T2WI) and T2-weighted gradient-echo(GRE-T2WI). MRI artifact sizes of different metal materials and three sequences were measured.Results Artifact size showed significant differences among different metal materials and different sequences.The artifact size of amalgams,Ag-Pd alloy,Au-Pd alloy or gold alloy was not significantly different from that of control group in FSE-T1WI sequence(P>0.05),while the artifact sizes of Ag-Pd alloy,Au-Pd alloy,titanium alloy and pure titanium were significantly larger in FSE-T2WI and GRE-T2WI sequence compared with the controls(P<0.05).Pure titanium and titanium alloy showed significantly larger artifact sizes in the three sequences compared with the controls(P<0.01).Conclusion MR image quality of precious metal alloys is affected by the sequence used and the alloy compositions,and also has relations with the gold content.Pure titanium and its alloys pose a problem with respect to causing MRI artifacts in different sequences.FSE-T2 WI and GRE-T2 WI sequence have more effects on the MRI artifact sizes of different alloys compared with FSE-T1 WI sequence.关键词
磁共振成像/金属伪影/口腔铸造合金/非铁磁性Key words
Magneticresonanceimaging/Metalartifact/Dentalcastingalloy/Non-ferromagnetism分类
医药卫生引用本文复制引用
韩武,潘小波,郝楠,彭利辉,钟爱喜,刘光雪..非铁磁性口腔金属材料磁共振成像伪影的实验研究[J].广西医学,2015,(7):888-890,899,4.基金项目
广西科学研究与技术开发计划 （）
