5种常用口腔材料的磁共振伪影比较

发布时间：2018-10-31 14:04

【摘要】：目的比较口腔科常用的3种金属和2种陶瓷材料在0.35、1.5及3 T 3种场强磁共振成像(MRI)不同序列中形成伪影的差异。方法将3种金属和2种陶瓷材料制作成同样大小及厚度的中切牙内冠,将其置入盛满生理盐水的塑料罐体中,分别在0.35、1.5和3.0 T的磁共振(MR)机中扫描获得T1WI、T2WI影像。比较各种材料在不同场强的MR扫描中伪影的差异。结果氧化锆在3种场强的MR机中扫描无明显伪影;铸造陶瓷伪影极轻微;贵金属合金、烤瓷镍铬合金与烤瓷钴铬合金在3种场强MR扫描中均出现不同程度的伪影。结论氧化锆、铸造陶瓷这两种常用口腔陶瓷材料基本无伪影或伪影极轻微。贵金属合金、烤瓷镍铬合金与烤瓷钴铬合金3种常用口腔金属材料易引起MRI伪影,且随着主磁体场强增加,伪影面积增大。
[Abstract]:Objective to compare the difference of artifacts between three kinds of metal and two kinds of ceramic materials commonly used in stomatology in three kinds of magnetic resonance imaging (MRI) sequences of 0.35 ~ (1.5) and 3T respectively. Methods three kinds of metals and two kinds of ceramic materials were made into inner crowns of the same size and thickness of central incisors, which were placed in plastic tanks filled with normal saline. T1WI was obtained by scanning in a 0.35U 1.5 and 3.0T MRI (MR) machine, respectively. T2WI image. The artifacts of different materials in MR scanning with different field intensities were compared. Results Zirconia had no obvious artifacts in three kinds of field strength MR machines, the artifacts of cast ceramics were very slight, and the artifacts of noble metal alloys, porcelain Ni-Cr alloys and ceramic cobalt-chromium alloys were all different degrees in three kinds of field strength MR scans. Conclusion Zirconia and cast ceramics are two kinds of commonly used oral ceramic materials without artifacts or artifacts. Three kinds of oral metal materials, such as precious metal alloy, porcelain nickel chromium alloy and porcelain cobalt chromium alloy, are apt to cause MRI artifacts, and the artifact area increases with the increase of the field strength of the main magnet.
【作者单位】：浙江大学医学院附属第二医院放射科;杭州市萧山区中医院放射科;
【分类号】：R445.2;R783.1

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