用于磁共振成像的超材料射频透镜
Metamaterial radiofrequency lens for magnetic resonance imaging
摘要：
这项工作的目的是测试一类新的无源电磁设备的能力，以增加磁共振（MR）成像系统的表面线圈的相控阵列的穿透深度。这种新设备是基于新兴的超材料技术，就像射频磁场的透镜。所提出的设备进行了测试，在几个1.5 T MR系统从不同的公司与不同的相控阵列相结合。其中一位作者被招募为实验的志愿者。在这些实验中，他的膝盖通过使用双相控阵列成像。将器械放置在膝关节之间，以检查该无源器械是否改善了弹簧圈的穿透深度。在所有实验中，成功测试了所提出的设备，并检查了志愿者的膝盖可以在更深的距离处成像，并且通过透镜的存在改善了所获得的MR图像中的信噪比（SNR）。所提出的设备已被证明可以增加表面线圈的MR相控阵列的穿透深度。通过膝关节的MR成像对该透镜进行了测试，但通过将其放置在关节之间，该透镜可用于同时对任何一对关节进行成像。阳性结果表明，使用该镜头成像女性乳房的可能性。这将使得有可能在没有更高场的情况下增加SNR，从而满足管理标准吸收率（SAR）的安全规定。
英文摘要：
The purpose of this work is to test the ability of a new class of passive electromagnetic device to increase the penetration depth of phased arrays of surface coils for magnetic resonance (MR) imaging systems. This new device is based on the emerging technology of metamaterials and behaves like a lens for the radiofrequency magnetic fields. The presented device was tested in several 1.5-T MR systems from different companies in combination with different phased arrays. One of the authors was enrolled as volunteer for the experiments. In these experiments his knees were imaged by using a dual phased array. The device was placed between the knees to check that the penetration depth of the coils was improved by this passive device. In all the experiments the presented device was successfully tested and it was checked that the knees of the volunteer can be imaged at deeper distances and that the signal-to-noise-ratio (SNR) in the obtained MR images was improved by the presence of the lens. The presented device has proven to increase the penetration depth of MR phased arrays of surface coils. The lens was tested by means of the MR imaging of the knees but it can be used to image any pair of joints simultaneously by placing it between the joints. The positive results suggest the possibility of using the lens to image the female breast. This would make it possible to increase the SNR without higher fields, thus fulfilling the safety regulations governing the standard absorption rate (SAR).
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