Quantification and minimization of magnetic susceptibility artifacts on GRE images
Quantification and minimization of magnetic susceptibility artifacts on GRE images
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DOI：
10.1097/00004728-200011000-00024
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发表时间：
2000-11-01
影响因子：
1.3
通讯作者：
Pomper, MG
中科院分区：
文献类型：
--
作者：
Port, JD;Pomper, MG
目的：探讨梯度回波(GRE)成像中消除金属磁化率伪影的最佳成像参数。方法：在含镍琼脂糖凝胶体模中对钛螺丝进行GRE成像，系统地改变几个参数来表征和量化磁化率伪影。结果：使用短TE可以最大程度地减小磁化率伪影的大小；增加频率矩阵和减小层厚也有助于减小伪影尺寸。只要有可能，植入的假体应与主磁场对齐，以尽量减少伪影大小。对伪影大小影响不大的参数包括带宽、相位编码矩阵和视野。结论：放射科医生可以很容易地在成像方案中调整上述参数，以提高植入金属装置患者的GRE图像质量。
Purpose: The purpose of this work was to determine the optimal imaging parameters far minimization of metallic susceptibility artifacts during gradient echo (GRE) imaging.Method: We performed GRE imaging of titanium screws in a nickel-doped agarose gel phantom, systematically varying several parameters to characterize and quantify susceptibility artifacts.Results: The greatest reduction in artifact size came from using a short TE; increasing the frequency matrix and decreasing the slice thickness also contributed substantially to reducing the artifact size. Whenever possible, implanted prostheses should be aligned with the main magnetic field to minimize artifact size. Parameters with negligible effect on artifact size included bandwidth, phase encode matrix, and field of view.Conclusion: Radiologists can easily adjust the above parameters in their imaging protocols to improve GRE image quality in patients with implanted metallic devices.