Artifacts from dental casting alloys in magnetic resonance imaging
Artifacts from dental casting alloys in magnetic resonance imaging
复制标题
DOI：
10.1177/154405910308200806
复制
发表时间：
2003-08-01
影响因子：
7.6
通讯作者：
Sasaki, T
中科院分区：
文献类型：
--
作者：
Shafiei, F;Honda, E;Sasaki, T
由于金属材料的存在，磁共振成像（MRI）的潜在优势受到伪影的限制。为定量评价牙科铸造合金和种植体材料在MR成像中伪影的大小，用1.5T磁共振成像仪对11种牙科铸造合金和种植体材料进行了3种不同序列的成像。测定感兴趣区域（1200 mm（2））内样本周围水信号强度（SI）的平均值和标准差，并比较变异系数，以评价SI的均匀性。观察到各种不同幅度的伪影。只有一个样品，主要由Pd，In和Sb组成，在所有成像序列中没有显示伪影。我们得出结论，根据其元素组成选择特定的牙科铸造合金可以最大限度地减少MRI中的金属伪影;然而，钛合金目前在引起MRI伪影方面存在问题。
The potential advantage of magnetic resonance imaging (MRI) has been limited by artifacts due to the presence of metallic materials. For quantitative evaluation of the magnitude of artifacts from dental casting alloys and implant materials in MR imaging, 11 dental casting or implant materials were imaged by means of 1.5 T MRI apparatus with three different sequences. Mean and standard deviation of water signal intensity (SI) around the sample in the region of interest (1200 mm(2)) were determined, and the coefficient of variation was compared for evaluation of the homogeneity of the SI. A variety of artifacts with different magnitudes was observed. Only one of the samples, composed mainly of Pd, In, and Sb, showed no artifacts in all imaging sequences. We concluded that selection of specific dental casting alloys according to their elemental compositions could minimize the metal artifacts in MRI; however, titanium alloys currently pose a problem with respect to causing MRI artifacts.