用于300 MHz磁共振成像应用中半波偶极天线长度控制与调谐性的离散介质涂层
Discrete Dielectric Coatings for Length Control and Tunability of Half-Wave Dipole Antennas at 300 MHz Magnetic Resonance Imaging Applications
AI总结：
本研究针对超高场MRI应用提出离散介质材料涂层偶极天线设计，通过两端高介电常数涂层优化调谐、降低SAR与B1场波动，其多通道阵列有望提升并行成像质量。
摘要：
本研究提出了一种新型离散介质材料涂层（DDMC）偶极天线设计，用于超高场（UHF）MRI应用。该设计通过在偶极子两端添加离散高介电常数介质涂层，改善了频率调谐性能，降低了电场强度，并减少了比吸收率（SAR）。研究将DDMC偶极子的性能与分段式偶极子设计进行了对比，评估指标包括单元间耦合、B1场分布以及信噪比（SNR）。仿真与实验结果表明，DDMC偶极子具备更优异的B1场均匀性，沿偶极导体的B1波动显著降低，同时减少了SAR，是超高场MR成像中MR信号激发与接收的更安全高效的选择。此外，凭借更优的电磁去耦性能，由所提出的DDMC偶极子构成的多通道阵列有望提升超高场MRI的并行成像效果与成像质量，未来工作将聚焦于材料优化与多通道阵列的可扩展性研究。
英文摘要：
This study presents a novel discretely dielectric material-coated (DDMC) dipole antenna design for ultra-high-field (UHF) MRI applications. This design improves frequency tuning, lowers electric field intensity, and reduces SAR by including discrete high-permittivity dielectric coatings at both ends of the dipole. The DDMC dipole's performance was compared to that of a fractionated dipole design using metrics such as inter-element coupling, B1 field distribution, and SNR. Simulations and experimental results showed that the DDMC dipole provided superior B1 field uniformity with significantly reduced B1 variation along the dipole conductor while reducing SAR, making it a safer and more efficient option for MR signal excitation and reception in UHF MR imaging. Furthermore, with its improved electromagnetic decoupling performance, the multichannel array made from the proposed DDMC dipoles shows promise for improving parallel imaging and imaging quality in UHF MRI, with future work focusing on material optimization and scalability for multi-channel arrays.
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