High-quality MR imaging with flexible transmission line resonators

Area of Science:

• Medical Imaging
• Biophysics
• Electrical Engineering

Background:

• Traditional magnetic resonance (MR) imaging surface coils face limitations in signal-to-noise ratio and adaptability.
• Dielectric losses and capacitive detuning can degrade image quality in conventional MR coils.
• Imaging challenging anatomical regions, such as the throat, requires flexible and stable coil designs.

Purpose of the Study:

• To introduce and evaluate a novel coaxial transmission line resonator (TLR) surface coil for human MR imaging.
• To demonstrate the TLR coil's ability to enhance signal-to-noise ratio (SNR) and image quality.
• To highlight the practical advantages of the TLR coil in clinical diagnostic MR imaging.

Main Methods:

• Development of a radio frequency receiving unit utilizing a coaxial transmission line resonator (TLR).
• Incorporation of a coaxial Faraday shield to mitigate dielectric losses and capacitive detuning.
• Assessment of the coil's adaptability to patient anatomy and ease of handling.

Main Results:

• The TLR coil achieved a high filling factor and a loaded Q-value of approximately 140.
• This resulted in a significantly improved signal-to-noise ratio, leading to high-quality MR images.
• The coil demonstrated flexibility, adapting to body contours and facilitating imaging of difficult regions like the throat.

Conclusions:

• The coaxial transmission line resonator (TLR) represents a significant advancement in MR imaging surface coil technology.
• Its inherent stability, high SNR, and adaptability offer superior performance compared to traditional coils.
• The TLR coil is a practical and effective tool for various diagnostic MR imaging applications, reducing preparation time and improving patient examination.