Zhu Xia, Wu Ke, Anderson Stephan W, Zhang Xin
Department of Mechanical Engineering, Boston University, Boston, MA, 02215, USA.
Photonics Center, Boston University, Boston, MA, 02215, USA.
Adv Sci (Weinh). 2025 Jan;12(3):e2410907. doi: 10.1002/advs.202410907. Epub 2024 Nov 25.
Magnetic resonance imaging (MRI) relies on high-performance receive coils to achieve optimal signal-to-noise ratio (SNR), but conventional designs are often bulky and complex. Recent advancements in metamaterial technology have led to the development of metamaterial-inspired receive coils that enhance imaging capabilities and offer design flexibility. However, these configurations typically face challenges related to reduced adaptability and increased physical footprint. This study introduces a hybrid receive coil design that integrates an array of capacitively-loaded ring resonators directly onto the same plane as the coil, preserving its 2D layout without increasing its size. Both the coil and metamaterial are individually non-resonant at the targeted Larmor frequency, but their mutual coupling induces a resonance shift, achieving a frequency match and forming a hybrid structure with enhanced SNR. Experimental validation on a 3.0 T MRI platform shows that this design allows for adjustable trade-offs between peak SNR and penetration depth, making it adaptable for various clinical imaging scenarios.
磁共振成像（MRI）依赖于高性能接收线圈来实现最佳信噪比（SNR），但传统设计通常体积庞大且复杂。超材料技术的最新进展导致了受超材料启发的接收线圈的发展，这些线圈增强了成像能力并提供了设计灵活性。然而，这些配置通常面临与适应性降低和物理占地面积增加相关的挑战。本研究介绍了一种混合接收线圈设计，该设计将一系列电容加载环形谐振器阵列直接集成到与线圈相同的平面上，在不增加其尺寸的情况下保留其二维布局。线圈和超材料在目标拉莫尔频率下单独均不谐振，但它们的相互耦合会引起谐振频率偏移，实现频率匹配并形成具有增强SNR的混合结构。在3.0 T MRI平台上的实验验证表明，这种设计允许在峰值SNR和穿透深度之间进行可调权衡，使其适用于各种临床成像场景。
