Computational Analysis of a Radiofrequency Knee Coil for Low-Field MRI Using FDTD
Computational Analysis of a Radiofrequency Knee Coil for Low-Field MRI Using FDTD
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DOI：
10.1007/s00723-012-0388-8
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发表时间：
2013-03
影响因子：
1
通讯作者：
V. Hartwig;S. Tassano;Alessio Mattii;N. Vanello;V. Positano;M. Santarelli;L. Landini;G. Giovannetti-G.-Giovann
中科院分区：
文献类型：
--
作者：
V. Hartwig;S. Tassano;Alessio Mattii;N. Vanello;V. Positano;M. Santarelli;L. Landini;G. Giovannetti-G.-Giovann
磁共振成像(MRI)对于肌肉骨骼疾病的诊断和治疗是必不可少的。低场(<；0.5T)成像是更昂贵的高场强度成像的一种经济高效的替代方案，因为它的设置便宜，患者更舒适，安全性更好。另一方面，与高场人体扫描仪相比，低场扫描仪产生的图像质量较差，信噪比较低。尤其是在低场磁共振成像中，接收线圈的性能对成像质量起着至关重要的作用。通常使用经典电磁理论来评估线圈的性能，但当线圈加载样本时，很难推导出解析解，因此通常采用试错法。在文献中，数值方法已经被提出作为预测MRI线圈性能的良好选择。本文采用工作台试验和基于时域有限差分法的软件程序对低场(0.5T)磁共振扫描仪用膝部线圈的性能进行了分析。将经典工作台试验测得的参数性能与数值模拟得到的参数性能进行了比较。最后，用商用低场磁共振系统采集的图像验证了膝关节线圈的性能。
Magnetic resonance imaging (MRI) is essential for the diagnosis and treatment of musculoskeletal conditions. Low-field (<0.5T) imaging is a cost-effective alternative to more expensive high-field strength imaging due to the inexpensive setting, greater patient comfort and better safety profile. On the other hand, if compared with high-field body scanners, the low-field scanners produce poor-quality images with lower signal-to-noise ratio. Especially in low-field MR, receiver coil performance plays a significant role in image quality. Coil performance is generally evaluated using classical electromagnetic theory, but when the coil is loaded with a sample, an analytical solution is extremely difficult to derive, so that a trial-and-error approach is often followed. Numerical methods have been proposed in literature as good alternatives to predict MRI coil performance. In this study the performance of a knee coil for low-field (0.5 T) MR scanners is analyzed using workbench tests and numerical simulation with a software program based on the finite difference time domain method. Parameter performances measured using the classical workbench test are compared with those obtained using numerical simulations. Finally, the knee coil performance is validated with images acquired in a commercial low-field MR system.