Wireless Resonators With Coupled Versus Decoupled Units: Which Enhances Local SNR of RF Receive Arrays Better?

Area of Science:

• Magnetic Resonance Imaging (MRI)
• RF Coil Design
• Biomedical Engineering

Background:

• Wireless resonators are crucial for enhancing MRI receive performance.
• Optimizing resonator design impacts signal-to-noise ratio (SNR) and parallel imaging capabilities.
• Local receive arrays are essential for high-resolution MRI.

Purpose of the Study:

• To compare the performance of two wireless resonator designs: one with strongly coupled units and another with decoupled units.
• To evaluate their effectiveness in enhancing MRI receive performance with local receive arrays.
• To assess improvements in SNR and parallel imaging (g-factor).

Main Methods:

• Fabrication and experimental evaluation of coupled and decoupled wireless resonator designs.
• Testing at 1.5 Tesla (T) using a 12-channel head receive array.
• Assessment of detuning efficiency, SNR improvements, and g-factor for parallel imaging.

Main Results:

• Decoupled wireless resonators demonstrated superior performance over coupled designs.
• Up to threefold improvement in SNR was observed with the decoupled design.
• Significant reduction in g-factor (max/avg from 4.6/1.8 to 3.1/1.3) was achieved, outperforming the original array.

Conclusions:

• Wireless resonators with decoupled units offer substantial advantages for MRI.
• These designs provide enhanced image quality through improved SNR and g-factor.
• The decoupled design is a promising choice for advanced wireless resonator applications in MRI.