Rivera M, Vaquero J J, Santos A, Ruiz-Cabello J, del Pozo F
Grupo de Bioingeniería y Telemedicina, Universidad Politécnica de Madrid, Spain.
Magn Reson Imaging. 1998;16(2):157-66. doi: 10.1016/s0730-725x(97)00273-7.
In this paper we present the spatial resolution enhancement and noise reduction level achieved with an optimized inductively coupled surface coil specifically designed for our experiments. The technique of designing and implementing customized coils for magnetic resonance imaging of very small structures is described. We have designed a low cost prototype of an inductively coupled circular surface coil, tuned for 1H magnetic resonance imaging at 200 MHz. The coil is mounted on a customized teflon support. The inductive coupling used in this coil improves the signal-to-noise ratio by reducing various loss mechanisms (specially the dielectric losses). Test images have been acquired to determine the evolution of induced articular lesions in a rabbit animal model, as well as brain tumors in rats. The images show high spatial resolution, excellent B1 field homogeneity and no "hot spots". Comparing these images with those acquired with conventional coils, one finds better spatial resolution and signal-to-noise ratio, as well as larger field of view with less intense illumination artifact. The methodology can be used in any application that requires high quality imaging of small structures.
在本文中，我们展示了使用专门为我们的实验设计的优化感应耦合表面线圈所实现的空间分辨率增强和降噪水平。描述了为非常小的结构的磁共振成像设计和实现定制线圈的技术。我们设计了一种低成本的感应耦合圆形表面线圈原型，调谐用于200 MHz的1H磁共振成像。该线圈安装在定制的聚四氟乙烯支架上。该线圈中使用的感应耦合通过减少各种损耗机制（特别是介电损耗）来提高信噪比。已经采集了测试图像，以确定兔动物模型中诱导关节损伤以及大鼠脑肿瘤的演变情况。图像显示出高空间分辨率、出色的B1场均匀性且无“热点”。将这些图像与用传统线圈采集的图像进行比较，可以发现具有更好的空间分辨率和信噪比，以及更大的视野和强度较低的照明伪影。该方法可用于任何需要对小结构进行高质量成像的应用中。
