Improvement of magnetic resonance imaging using a wireless radiofrequency resonator array.
Improvement of magnetic resonance imaging using a wireless radiofrequency resonator array.
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DOI：
10.1038/s41598-021-02533-3
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发表时间：
2021-11-29
影响因子：
4.6
通讯作者：
Balchandani P
中科院分区：
文献类型：
--
作者：
Alipour A;Seifert AC;Delman BN;Robson PM;Shrivastava R;Hof PR;Adriany G;Fayad ZA;Balchandani P
近年来，在 7 特斯拉或更高的静态磁场强度下运行的新型人体磁共振成像系统已经问世，与较低的磁场强度相比，可提供更好的信号灵敏度。然而，由于与波长效应相关的技术挑战，在如此高的场强和相关进动频率下对人体大小的物体进行成像受到限制，当使用传统线圈时，波长效应会严重干扰人体上的发射场均匀性。在这里，我们报告了一种新颖的无源电感耦合射频谐振器阵列设计，其结构简单，可与传统线圈配合使用，仅需要调谐到扫描仪的工作频率。我们表明，谐振器阵列和线圈之间的电感耦合提高了目标区域的传输效率和信号灵敏度。简单的结构、灵活性和成本效益使得所提出的阵列设计成为改变发射场分布的有吸引力的方法，特别是在高场系统中，其中波长与组织尺寸相当。
In recent years, new human magnetic resonance imaging systems operating at static magnetic fields strengths of 7 Tesla or higher have become available, providing better signal sensitivity compared with lower field strengths. However, imaging human-sized objects at such high field strength and associated precession frequencies is limited due to the technical challenges associated with the wavelength effect, which substantially disturb the transmit field uniformity over the human body when conventional coils are used. Here we report a novel passive inductively-coupled radiofrequency resonator array design with a simple structure that works in conjunction with conventional coils and requires only to be tuned to the scanner’s operating frequency. We show that inductive-coupling between the resonator array and the coil improves the transmit efficiency and signal sensitivity in the targeted region. The simple structure, flexibility, and cost-efficiency make the proposed array design an attractive approach for altering the transmit field distribution specially at high field systems, where the wavelength is comparable with the tissue size.
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