Reduction of gradient acoustic noise in MRI using SENSE-EPI

Neuroimage. 2002 Aug;16(4):1151-5. doi: 10.1006/nimg.2002.1119.

Abstract

A new approach to reduce gradient acoustic noise levels in EPI experiments is presented. Using multichannel RF receive coils, combined with SENSE data acquisition and reconstruction, gradient slew-rates in single-shot EPI were reduced fourfold for rate-2 and ninefold for rate-3 SENSE. Multislice EPI experiments were performed on three different scanner platforms. With 3.4 mm in-plane resolution, measuring 6 slices per second (12 slices with 2000 ms TR), this resulted in average sound pressure level reductions of 11.3 dB(A) and 16.5 dB(A) for rate-2 and rate-3 SENSE, respectively. BOLD fMRI experiments, using visually paced finger-tapping paradigms, showed no detrimental effect of the acoustic noise reduction strategy on temporal noise levels and t scores.

MeSH terms

  • Adult
  • Echo-Planar Imaging*
  • Female
  • Fingers / physiology
  • Humans
  • Image Processing, Computer-Assisted*
  • Magnetic Resonance Imaging
  • Male
  • Motor Cortex / physiology*
  • Noise*
  • Oxygen / blood

Substances

  • Oxygen