Magnetic resonance (MR) images spatial resolution, which is a key factor in early diagnosis of many diseases, is fundamentally limited by the signal-to-noise ratio, which in turn depends upon the efficiency of the receive radiofrequency coils design. Many various multi-channel coils were designed to improve the quality of MR images. Another way to enhance the quality of magnetic resonance imaging (MRI) is the implementation of resonators based on novel materials, such as high-permittivity dielectrics. Here, we investigate the potential for the sensitivity enhancement with higher-order modes of dielectric resonators. We numerically show that because of the unique near field spatial distribution of a dielectric resonator third-order mode, the receive performance can be substantially improved in comparison with a conventional metallic loop coil of the same dimensions. Moreover, we study the performance of the dielectric resonator in comparison with a metallic loop coil, which size was optimized to match the sensitivity of the resonator at a particular distance. We demonstrate a 9-fold larger planar field-of-view with the dielectric resonator than with the loop coil. Our work provides the design guidelines for the improvement of near-field MRI sensitivity with the dielectric resonators.

磁共振（MR）图像的空间分辨率是许多疾病早期诊断的关键因素，其信噪比从根本上限制了信噪比，而信噪比又取决于接收射频线圈设计的效率。设计了许多不同的多通道线圈来提高MR图像的质量。提高磁共振成像（MRI）质量的另一种方法是基于新型材料（例如高介电常数电介质）的谐振器的实现。在这里，我们研究电介质谐振器的高阶模式提高灵敏度的潜力。我们用数值方法表明，由于介电共振器三阶模式具有独特的近场空间分布，与相同尺寸的常规金属环形线圈相比，接收性能可以大大提高。此外，我们研究了与金属环形线圈相比的介电共振器的性能，该线圈的尺寸经过了优化，以匹配特定距离处的共振器的灵敏度。我们证明了使用介质谐振器的平面视场比使用环形线圈大了9倍。我们的工作提供了使用介电共振器改善近场MRI灵敏度的设计指南。我们证明了介质谐振器的平面视场比环形线圈大了9倍。我们的工作提供了使用介电共振器改善近场MRI灵敏度的设计指南。我们证明了使用介质谐振器的平面视场比使用环形线圈大了9倍。我们的工作提供了使用介电共振器改善近场MRI灵敏度的设计指南。