Influence of magnetic susceptibility and volume on MRI artifacts produced by low magnetic susceptibility Zr-14Nb alloy and dental alloys
Influence of magnetic susceptibility and volume on MRI artifacts produced by low magnetic susceptibility Zr-14Nb alloy and dental alloys
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DOI：
10.4012/dmj.2018-426
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发表时间：
2020-04-01
影响因子：
2.5
通讯作者：
Kawasaki, Akira
中科院分区：
文献类型：
--
作者：
Kajima, Yuka;Takaichi, Atsushi;Kawasaki, Akira
定量评估磁共振(MR)图像中产生的伪影体积，以研究伪影行为如何与植入的金属装置的磁化率和体积相关。为此，采用四种不同直径的球形试件，将一种新型低磁化率的Zr-14Nb合金与两种传统牙科合金--Ti-6Al-7Nb合金和Co-Cr-Mo合金进行了比较。然后，在快速自旋回波和梯度回波条件下记录MR图像，测量伪影体积。伪影体积随着样品的磁化率、体积和质量的增加而减小，并观察到显著的线性相关。伪影体积可以通过这里给出的方程来估计；然而，需要进一步的研究来解释一些重要因素(例如成像条件、形状和方向)的影响，以便更准确地预测伪影体积。
The artifact volume generated in magnetic resonance (MR) images was quantitatively evaluated to investigate how artifact behavior correlates to the magnetic susceptibility and volume of an implanted metal device. For this, a new low-magnetic-susceptibility Zr-14Nb alloy was compared with two conventional dental alloys, Ti-6Al-7Nb alloy and Co-Cr-Mo alloy, using spherical specimens of each alloy prepared with four different diameters. Then, MR images were recorded under fast spin echo and gradient echo conditions, from which the artifact volume was measured. The artifact volume decreased with the magnetic susceptibility, volume, and mass of the specimens, and significant linear correlations were observed. The artifact volume can be estimated by the equations presented here; nevertheless, further studies are necessary to interpret the influence of some important factors (e.g., imaging conditions, shape, and orientation) to predict the artifact volume more precisely.