Animal models have been utilized for many decades to examine human diseases and symptoms via magnetic resonance imaging (MRI) techniques. To avoid the fatal effects of the strong static magnetic field (B₀) when imaging the mouse brain at higher Tesla values in MRI, i.e., 7-T, we propose a compact metamaterial magnetic sheet which can improve the image resolution for simulation of the mouse brain even at lower Tesla values in MRI systems. The magnetic sheet operates at 3.7-T MRI working frequency and provides a passband within its interfaces to restore the formation of scattering of an evanescent radio-frequency (RF) field radiating from the MRI gradient coils towards the sheet. We show in the optimized simulated test bed setup that the magnetic sheet localizes and adjusts the response of the evanescent RF field and improves the transient transverse magnetic field B₁ and signal-to-noise ratio at the designated region of interest, i.e., mouse brain (M_b), where B₁ at the mouse brain is the response of the static magnetic field B₀ generated by the magnetic resonance gradient coils. The unique concept proposed here is that negative permeability (−μ) controls the metamaterial magnetic sheet to improve image resolution inside the human brain without increasing B₀ intensity at the brain, in order to avoid thermal heating of the brain tissues.

数十年来，动物模型已通过磁共振成像（MRI）技术用于检查人类疾病和症状。为避免强静电磁场（B ₀）当在MRI中以较高的Tesla值（即7-T）对小鼠大脑成像时，我们提出了一种紧凑的超材料磁性薄板，即使在MRI系统中以较低的Tesla值也可以提高模拟鼠标大脑的图像分辨率。磁性薄板以3.7-T MRI工作频率工作，并在其界面内提供通带，以恢复从MRI梯度线圈向薄板辐射的van逝射频（RF）场的散射。我们在优化的模拟测试台设置中显示出，磁性片可以定位并调整RF逝RF场的响应，并可以改善指定感兴趣区域（即小鼠大脑）的瞬态横向磁场B ₁和信噪比（M _b），其中鼠标大脑处的B ₁是磁共振梯度线圈产生的静磁场B ₀的响应。此处提出的独特概念是，负磁导率（-μ）控制超材料磁片，以提高人脑内部的图像分辨率，而不会增加脑部的B ₀强度，从而避免了脑组织的过热。