Applications of a 32-channel ultra-flexible phased-array prototype coil design optimized for small joint 3-Tesla MRI

Area of Science:

• Medical Imaging
• Biophysics
• Coil Engineering

Background:

• Hand and wrist MRI requires high spatial resolution and signal-to-noise ratio (SNR) for small structures.
• Conventional coils face challenges in balancing image quality, coverage, and scan speed for these regions.

Purpose of the Study:

• To evaluate a prototype high-density, flexible 32-channel coil array for 3T hand and wrist MRI.
• To compare its performance against conventional 16-channel coils regarding SNR, coverage, and accelerated imaging.

Main Methods:

• Developed a flexible 32-channel phased-array prototype coil with novel dual-loop elements.
• Conducted phantom studies to assess SNR and noise amplification at various acceleration factors (R=2-5).
• Performed comparative MRI scans in healthy volunteers and patients across different anatomical regions.

Main Results:

• The prototype coil demonstrated ~26% higher SNR and significantly lower g-factors in phantom tests.
• Achieved superior-inferior coverage of 23.9 cm, exceeding conventional coils (20.5-20.6 cm).
• Maintained image quality at higher acceleration factors, enabling visualization of small anatomical structures.

Conclusions:

• The 32-channel prototype coil offers enhanced SNR, extended field-of-view (FOV), and flexible design for accelerated MRI.
• It provides technical improvements over conventional coils for hand, wrist, and other anatomical imaging.
• This coil facilitates high-resolution imaging with broader coverage, improving diagnostic capabilities.