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Related Experiment Video

Updated: Jul 10, 2026

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

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Model gradient coil employing active acoustic control for MRI.

B Haywood¹, B Chapman, P Mansfield

¹Sir Peter Mansfield Magnetic Resonance Centre, University of Nottingham, University Park, Nottingham NG7 2RD, UK. brett@bhaywood.freeserve.co.uk

Magma (New York, N.Y.)

|November 16, 2007

Summary

Active acoustic control significantly reduces noise during rapid echo-planar imaging (EPI) at 3.0 T. This technology achieves substantial noise reduction within the magnet bore and externally, enhancing MRI environments.

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Area of Science:

Magnetic Resonance Imaging (MRI)
Acoustics
Biomedical Engineering

Background:

High-field MRI systems, such as 3.0 T scanners, utilize gradient coils for spatial encoding.
Switching gradient coils generate significant acoustic noise, posing challenges for patient comfort and data acquisition.
Echo-planar imaging (EPI) sequences are susceptible to acoustic noise interference.

Purpose of the Study:

To evaluate the effectiveness of active acoustic control integrated into a three-axis gradient coil.
To assess noise reduction during a single-shot rapid EPI sequence at 3.0 T.
To quantify noise reduction levels both inside and outside the magnet bore.

Main Methods:

A model three-axis gradient coil with active acoustic control was implemented.
The system was tested during a single-shot rapid EPI sequence at 3.0 T.
Acoustic noise levels were measured inside the magnet bore (over the specimen area) and outside the acoustic chamber.
Results were compared against a control winding configuration.

Main Results:

Active acoustic control achieved substantial noise reduction during rapid EPI acquisition (10.6 ms total time).
Internal noise reduction over the specimen area reached approximately 40 dB(A).
External noise reduction outside the acoustic chamber ranged from 60-67 dB(A).
A control winding added approximately 6 dB(A) in its non-optimized mode.

Conclusions:

Active acoustic control is effective in mitigating noise generated by gradient coils in 3.0 T MRI.
Significant noise reduction levels were demonstrated, improving the acoustic environment within and around the MRI scanner.
This technology has the potential to enhance patient comfort and reduce artifacts in fast imaging sequences like EPI.