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A method for preamplifier-decoupling improvement in quadrature phased-array coils.

Ceylan Celil Guclu¹, Ed Boskamp, Tsinghua Zheng

¹General Electric Medical Systems, MR Engineering, Milwaukee, Wisconsin 53188, USA. celil.guclu@med.ge.com

Journal of Magnetic Resonance Imaging : JMRI

|January 28, 2004

Summary

A new quadrature combiner configuration significantly improves preamplifier decoupling in MRI coils. This advancement enhances signal quality by reducing interference in quadrature phased-array coils.

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Area of Science:

Medical Imaging
Radiofrequency Engineering

Background:

Quadrature phased-array coils are crucial for Magnetic Resonance Imaging (MRI).
Preamplifier decoupling is essential for maintaining signal integrity in these coils.
Existing methods for preamplifier decoupling can be complex and may require integrating preamplifiers directly into the coil.

Purpose of the Study:

To enhance preamplifier decoupling in a quadrature phased-array coil.
To introduce a novel quadrature combiner configuration for improved performance.

Main Methods:

Utilized a commercial six-element quadrature cervical-thoracic-lumbar (CTL) coil on a 1.5 T GE Signa Lx Scanner.
Designed a new quadrature combiner configuration based on flux linkage principles of loop and butterfly elements.
Employed an imaging-based element coupling measurement method to assess performance.

Main Results:

The new quadrature combiner configuration achieved an approximate -8dB improvement in preamplifier decoupling.
Demonstrated the effectiveness of the new configuration through imaging-based measurements.
Validated the enhanced decoupling performance.

Conclusions:

One-dimensional quadrature phased arrays can be constructed without integrating preamplifiers into the coil.
Optimized placement of coil elements (butterflies on high impedance, loops on low impedance) relative to the combiner is key.
The proposed combiner configuration offers a practical solution for improving MRI coil performance.