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Functional MRI of brain activation induced by scanner acoustic noise

✍ Scribed by Peter A. Bandettini; A. Jesmanowicz; Joel van Kylen; Rasmus M. Birn; James S. Hyde

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
765 KB
Volume
39
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

A method is introduced by which brain activation caused by the acoustic noise associated with echo planar imaging (EPI) is mapped. Two types of time series were compared. The first time series, considered the “task,” involved applying only EPI gradients for 20 s without the application of RF pulses, then, without pause, starting image collection. The second, considered the “control,” involved typical sequential image acquisition without the prior gradient pulses. Subtraction of the first 5 s of the two time series revealed signal enhancement mainly in the primary auditory cortex. The technique was validated using a motor cortex task that mimicked the hypothesized scanner noise induced activation.

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