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Updated: Jun 23, 2026

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Revisiting Inductively Coupled Wireless Coils in MRI: Mitigating Over-Coupling With Preamplifiers.

Ming Lu¹, John C Gore^1,2,3, Xinqiang Yan^1,3,4

¹Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, Tennessee, USA.

Magnetic Resonance in Medicine

|June 22, 2026

Summary

This summary is machine-generated.

Modern preamplifiers allow inductively coupled coils to function effectively near primary coils, overcoming traditional issues like resonance splitting and impedance mismatch. This simplifies MRI coil design without sacrificing signal-to-noise ratio (SNR).

Keywords:

RF coils impedance mismatch inductively coupled coils preamplifier decoupling wireless coils

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Last Updated: Jun 23, 2026

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Published on: January 16, 2021

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Published on: April 4, 2013

Area of Science:

Magnetic Resonance Imaging (MRI)
Coil Engineering
Radiofrequency Physics

Background:

Inductively coupled coils improve local MRI sensitivity.
Strong coupling typically causes detrimental resonance splitting and impedance mismatch.

Purpose of the Study:

Investigate the effectiveness of inductively coupled coils under severe coupling conditions.
Clarify the role of modern receive preamplifiers in mitigating coupling effects.

Main Methods:

Bench experiments with varying coil sizes and magnetic field strengths (1.5, 3, 7T).
Evaluation of resonance and impedance under different preamplifier terminations (open-circuit, 50-Ω, low-input-impedance).
MRI validation at 7T with coupled coils and varied preamplifier decoupling.

Main Results:

Low-input-impedance preamplifiers maintained inductively coupled coil resonance despite strong coupling.
Primary coil impedance shifts were acceptable, causing negligible SNR penalty.
Degraded preamplifier decoupling reduced SNR by 21%-23%.

Conclusions:

Modern preamplifiers significantly alter coupled-coil behavior.
Inductively coupled coils can operate close to primary coils without substantial SNR loss.
Simplified inductively coupled coil design is enabled by modern preamplifiers.