500 MHz Inductive Birdcage RF Coil for Brain MRI: Design, Implementation and Validation.

• Tác giả: Nicolas Boulant, Jacco A de Zwart, Stephen J Dodd, Jeff H Duyn, Natalia Gudino, Alan P Koretsky, Frank Mauconduit, Joe Murphy-Boesch, Peter van Gelderen, Alexandre Vignaud
• Ngôn ngữ: eng
• Ký hiệu phân loại: 691.99 Adhesives and sealants
• Thông tin xuất bản: United States : IEEE transactions on bio-medical engineering , 2025
• Bộ sưu tập: NCBI
• ID: 753679

Tóm tắt

OBJECTIVE: We present a 500 MHz inductive birdcage RF resonator for imaging the human brain in an 11.7 T MRI scanner. METHODS: A homogenous circularly polarized transmit field ( text{B}_{1}^{+} was generated by transmitting power to the resonator through four couplers driven in differential mode and with an incremental 90-degree phase delay. A detailed mechanical and electrical model of the hardware, loaded with different phantoms, was generated and its performance simulated using a finite-difference time-domain method. RESULTS: The head-size inductively coupled birdcage presented a fundamental mode at 500 MHz. MR thermometry maps were in good agreement with heating profiles estimated from simulated SAR maps Conclusion: The model of the hardware was validated through both bench and MRI measurements. SIGNIFICANCE: This validation is important for future analysis of radiofrequency safety and performance at ultra-high field MRI through the prediction of SAR and text{B}_{1}^{+} rofiles across different human brain models at various positions inside the coil.