Actively Decoupled Transmit-Receive Coil-Pair for Mouse Brain MRI

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Biomedical Engineering
• Neuroimaging

Background:

• High-performance radiofrequency (RF) coils are crucial for detailed magnetic resonance imaging (MRI) studies, particularly in small animal models like mice.
• Existing RF coil designs can be expensive, complex, or lack compatibility with diverse MRI systems, limiting their widespread application in neuroscience research.

Purpose of the Study:

• To develop and characterize a cost-effective, high-performance radiofrequency (RF) coil pair specifically designed for high-resolution magnetic resonance imaging (MRI) of the mouse brain.
• To create an RF coil system that is easy to set up, offers excellent B1 field uniformity, and is compatible with a wide range of MRI scanners.

Main Methods:

• A dual-coil configuration was designed, featuring a high-sensitivity surface receiving coil and a larger, open-architecture volume transmit coil positioned externally.
• Active decoupling was implemented using PIN diodes and an external amplifier, eliminating the need for orthogonal coil orientation.
• The system was designed for platform independence, requiring only a transmit/receive (T/R) signal for operation.

Main Results:

• The described RF coil pair demonstrates high spin-sensitivity and good B1 uniformity across the mouse brain.
• The open architecture of the volume coil facilitates easy experimental setup and clear access to the subject's head.
• Active decoupling via PIN diodes allows for flexible coil placement without requiring orthogonal orientation, enhancing usability.

Conclusions:

• This low-cost, high-performance RF coil pair offers a practical solution for advanced mouse brain MRI.
• Its platform independence and ease of use make it a versatile tool for neuroscience research, adaptable to various MRI platforms.