An RF coil design to enable quintuple nuclear whole-brain MRI

Area of Science:

• Medical Imaging
• Biophysics
• Radiofrequency Engineering

Background:

• Metabolic imaging using multi-nuclear magnetic resonance (NMR) requires advanced radiofrequency (RF) hardware for practical clinical application.
• Current RF coil technology presents limitations in simultaneously acquiring data from multiple nuclear species.

Purpose of the Study:

• To develop and evaluate a highly integrated RF coil system for whole-brain Magnetic Resonance Imaging (MRI) and Magnetic Resonance Spectroscopy (MRS).
• To enable practical, multi-nuclear metabolic imaging by supporting five key nuclear species: 1H, 19F, 31P, 23Na, and 13C.

Main Methods:

• Design and implementation of a novel RF coil integrating dipole antennas and local receiver loops.
• Targeting five nuclear species (1H, 19F, 31P, 23Na, 13C) for simultaneous MRI and MRS acquisition.
• Utilizing bench measurements, electromagnetic simulations, and in vivo scans on healthy volunteers.

Main Results:

• Achieved high-quality in vivo scans for 1H, 31P, 23Na, and 13C in healthy volunteers.
• Demonstrated 77% transmit efficiency for 1H compared to a commercial head coil.
• Reported 110% Signal-to-Noise Ratio (SNR) for 31P at the subject's center compared to a dual-tuned birdcage coil, with minimal SNR loss for other nuclei (15-30%).

Conclusions:

• The developed RF coil enables simultaneous acquisition of 1H anatomic images and multi-NMR metabolic data within a single scan session.
• This integrated approach eliminates the need for hardware replacement or patient repositioning, facilitating morphologic and metabolic MRI.
• The system supports practical clinical translation of metabolic imaging, offering efficient and comprehensive diagnostic capabilities.