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Noise correlation in multicoil receiver systems.

¹Department of Clinical Physics, Walsgrave Hospital, Coventry, England.

Magnetic Resonance in Medicine

|March 1, 1992

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Correlated noise in multiple radiofrequency (RF) coils can reduce magnetic resonance imaging (MRI) sensitivity. This study presents a general analysis and a simple expression for total noise correlation in RF receiver systems.

Area of Science:

Medical Imaging
Physics
Electrical Engineering

Background:

Multiple radiofrequency (RF) coils enhance magnetic resonance imaging (MRI) sensitivity but can suffer from correlated noise.
Noise correlation from coil elements is understood, but sample-induced noise correlation remains debated.

Purpose of the Study:

To develop a general analysis for noise correlation in multi-coil MRI systems.
To derive a simplified expression for total noise correlation, encompassing both coil and sample noise sources.

Main Methods:

Analysis based on principles of reciprocity, superposition, and energy conservation.
Derivation of noise correlation equations in terms of circuit impedances.

Main Results:

Related Experiment Videos

An equation for sample-induced noise correlation was derived using circuit impedances.
A simple, general expression for total noise correlation between receiver coils was obtained.

Conclusions:

The derived expression simplifies the assessment of noise correlation in various RF receiver systems.
This work provides a unified approach to understanding noise limitations in multi-coil MRI.