Mechanically adjustable coil array for wrist MRI.

Area of Science:

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

Background:

• Standard MRI receiver coils may not optimally conform to individual patient anatomy, potentially limiting image quality.
• Achieving robust electrical behavior and signal-to-noise ratio (SNR) performance in adjustable coils presents significant engineering challenges.

Purpose of the Study:

• To propose and implement a mechanically adjustable MRI receiver coil array for enhanced human wrist imaging.
• To evaluate the SNR performance and anatomical adaptability of the designed coil array.

Main Methods:

• Construction of an eight-channel wrist array for proton MRI at 3 Tesla with a mechanism for close anatomical fit.
• Implementation of preamplifier decoupling and pi network matching strategies to ensure robust electrical behavior.
• Phantom and in vivo imaging experiments to assess SNR robustness and anatomical conformity.

Main Results:

• The adjustable coil array demonstrated robust SNR performance, with minimal variation in the critical central imaging region despite changes in coil matching.
• Bringing coil elements as close as 3 mm to the target volume significantly improved SNR, as confirmed in wrist phantoms of varying sizes.
• Initial in vivo imaging validated the high-sensitivity detection capabilities for highly resolved structural imaging of the wrist.

Conclusions:

• Mechanically adjustable MRI receiver coil arrays can be effectively implemented for wrist imaging, offering improved anatomical conformity.
• The developed coil array design ensures robust electrical performance and consistent SNR, leading to enhanced image quality for detailed wrist anatomy visualization.