Active Acoustic Screening: Reduction of Noise in Gradient Coils by Lorentz Force Balancing
✍ Scribed by Peter Mansfield; Barry L. W. Chapman; Richard Bowtell; Paul Glover; Ron Coxon; Paul R. Harvey
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 941 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0740-3194
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
We have designed and constructed a quiet gradient set with restricted access for the combined purposes of evaluating the principles of active acoustic screening, recently introduced by Mansfield, Glover, and Bowtell, and for EPI studies of the head at 3.0 T. The design utilizes the return paths of the conductors in a closed arc loop arrangement to eliminate net Lorentz forces thereby attenuating acoustic noise especially at low frequency. This design should significantly reduce the dangers to patients of high noise levels, especially in high field magnetic resonance imaging systems.