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Optimized gradient pulse for use with EPI employing active acoustic control
B L W Chapman1, B Haywood, P Mansfield
1General Magnetic, Strelley Hall, Strelley, Nottingham, UK. general-magnetic@fsmail.net
Magnetic Resonance in Medicine
|October 31, 2003
Summary
Active acoustic control significantly reduces MRI noise. A new acoustic gradient pulse combined with active control achieved a 50 dB noise reduction in echo-planar imaging (EPI).
Area of Science:
- Medical Imaging Physics
- Acoustics Engineering
- Biomedical Signal Processing
Background:
- Acoustic noise from Magnetic Resonance Imaging (MRI), especially during high-speed echo-planar imaging (EPI), is a significant issue.
- Previous active acoustic control methods achieved a 30 dB noise reduction using narrow-band spot frequencies.
Purpose of the Study:
- To introduce a novel acoustic gradient pulse for EPI.
- To enhance active acoustic control for greater noise reduction in MRI.
Main Methods:
- Development of a new finite-duration oscillating acoustic gradient pulse incorporating a band of frequencies.
- Integration of this pulse with active acoustic control systems for EPI.
- Measurement of acoustic noise reduction levels.
Main Results:
- The novel acoustic gradient pulse was designed for use as the switched read gradient in EPI.
- Employing the new pulse with active acoustic control resulted in a substantial 50 dB reduction in acoustic noise.
Conclusions:
- The developed acoustic gradient pulse effectively enhances active acoustic control for MRI.
- This method offers a significant improvement in noise reduction for high-speed EPI, improving patient comfort and data quality.