Theory and application of array coils in MR spectroscopy

¹Department of Electrical Engineering, Texas A&M University, College Station, USA.

|May 23, 1998

Summary

Phased array coils significantly improve signal-to-noise ratio in magnetic resonance spectroscopy (MRS) imaging. These advanced coil designs offer enhanced sensitivity compared to traditional single coils, particularly for brain imaging applications.

Area of Science:

Magnetic Resonance Imaging (MRI)
Spectroscopy
Coil Engineering

Background:

Array coils are crucial for enhancing signal-to-noise ratio (SNR) in magnetic resonance (MR) applications.
Phased array techniques are particularly relevant for MR spectroscopy (MRS) to optimize data acquisition.
Understanding coil performance metrics like fields and coupling is essential for effective design.

Purpose of the Study:

To review the theory and application of array coils in phased array spectroscopy.
To optimize the signal-to-noise ratio (SNR) for phased array transmit coils.
To examine the signal-to-noise advantages of array coils over single coils.

Main Methods:

Development of SNR optimization by considering phased array transmit coil efficiency.
Characterization of array coil performance, including fields, coupling, and mutual inductance.
Numerical simulations of planar (2x2, 4x4, 8x8) and cylindrical (16-element) arrays compared to single coils.
Phantom measurements and computational methods for comparing a 16-element cylindrical array to a birdcage coil.

Main Results:

Significant SNR improvement observed near planar array coils compared to single coils of the same dimensions.
Array coil sensitivity advantage diminishes with distance but remains superior to single coils or elements.
A 16-element cylindrical array demonstrated comparable or superior performance to a standard birdcage coil.

Conclusions:

Phased array coil techniques offer substantial SNR benefits for MR spectroscopy.
The developed approach for SNR optimization is valuable for future transmit phased array coil designs.
Proton spectroscopic images of the brain demonstrate the practical application of these phased array techniques.

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Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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