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Abstract #1643

Reduction of Scanner’s Noise in Recorded Voice Responses Using an Inline Reference Scanner’s Noise for Automated Measurement of Voice Response Time in Overt Speech fMRI

Kwan-Jin Jung1 and Jacquie Kurland2

1Institute of Applied Life Sciences, Human MR Center, University of Massachusetts Amherst, Amherst, MA, United States, 2Department of Communication Disorders, University of Massachusetts Amherst, Amherst, MA, United States

The overt voice response in fMRI is critical to aphasia neuroimaging studies. A commercially available active noise cancelling microphone makes this application possible. However, an automated measurement of the voice response time is not reliable due to remaining scanner noises. The incomplete noise cancellation is due to uneven slice time intervals in the EPI sequence. The remaining noise was reduced using a post-processing approach based on a previously published method that used a template of a reference noise. The response time was measured from the noise-reduced voice signal using an amplitude and duration threshold after an envelope filtering.

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