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. 2006 Oct;120(4):1791-4.
doi: 10.1121/1.2335423.

Synchronized and noise-robust audio recordings during realtime magnetic resonance imaging scans

Erik Bresch  1 , Jon Nielsen, Krishna Nayak, Shrikanth Narayanan
Affiliations

Synchronized and noise-robust audio recordings during realtime magnetic resonance imaging scans

Erik Bresch et al. J Acoust Soc Am. 2006 Oct.

Abstract

This letter describes a data acquisition setup for recording, and processing, running speech from a person in a magnetic resonance imaging (MRI) scanner. The main focus is on ensuring synchronicity between image and audio acquisition, and in obtaining good signal to noise ratio to facilitate further speech analysis and modeling. A field-programmable gate array based hardware design for synchronizing the scanner image acquisition to other external data such as audio is described. The audio setup itself features two fiber optical microphones and a noise-canceling filter. Two noise cancellation methods are described including a novel approach using a pulse sequence specific model of the gradient noise of the MRI scanner. The setup is useful for scientific speech production studies. Sample results of speech and singing data acquired and processed using the proposed method are given.

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Figures

FIG. 1
FIG. 1
System level diagram of the audio acquisition system.
FIG. 2
FIG. 2
Glue logic timing diagram.
FIG. 3
FIG. 3
Noise sources and microphone arrangement.
FIG. 4
FIG. 4
Adaptive FIR filter using NLMS algorithm for direct cancellation of interference from MRI scanner noise.
FIG. 5
FIG. 5
Adaptive FIR filter using NLMS algorithm for model-based cancellation of interference from MRI scanner noise.
FIG. 6
FIG. 6
Sample wave forms for SNR estimation.
See this image and copyright information in PMC

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