Characterizing Response to Elemental Unit of Acoustic Imaging Noise: An fMRI Study

Acoustic imaging noise produced during functional magnetic resonance imaging (fMRI) studies can hinder auditory fMRI research analysis by altering the properties of the acquired time-series data. Acoustic imaging noise can be especially confounding when estimating the time course of the hemodynamic...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 2009-07, Vol.56 (7), p.1919-1928
Main Authors: Tamer, Gregory G., Luh, Wen-Ming, Talavage, Thomas M.
Format: Article
Language:English
Subjects:
Acoustic imaging
Acoustic noise
Acoustic Stimulation - adverse effects
Acoustics
Adult
Amplitudes
Auditory Cortex - physiology
auditory system
biomedical image processing
Brain Mapping
Cortexes
Female
Foundations
Hemodynamic responses
Hemodynamics
Humans
Image analysis
Image Processing, Computer-Assisted - methods
Magnetic analysis
Magnetic noise
Magnetic properties
Magnetic resonance imaging
Magnetic Resonance Imaging - methods
Male
Marketing
Mathematical models
modeling
Models, Neurological
Models, Statistical
Noise
Noise level
Phantoms, Imaging
Time series analysis
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Summary:Acoustic imaging noise produced during functional magnetic resonance imaging (fMRI) studies can hinder auditory fMRI research analysis by altering the properties of the acquired time-series data. Acoustic imaging noise can be especially confounding when estimating the time course of the hemodynamic response (HDR) in auditory event-related fMRI (fMRI) experiments. This study is motivated by the desire to establish a baseline function that can serve not only as a comparison to other quantities of acoustic imaging noise for determining how detrimental is one's experimental noise, but also as a foundation for a model that compensates for the response to acoustic imaging noise. Therefore, the amplitude and spatial extent of the HDR to the elemental unit of acoustic imaging noise (i.e., a single ping) associated with echoplanar acquisition were characterized and modeled. Results from this fMRI study at 1.5 T indicate that the group-averaged HDR in left and right auditory cortex to acoustic imaging noise (duration of 46 ms) has an estimated peak magnitude of 0.29% (right) to 0.48% (left) signal change from baseline, peaks between 3 and 5 s after stimulus presentation, and returns to baseline and remains within the noise range approximately 8 s after stimulus presentation.
ISSN:0018-9294
1558-2531
DOI:10.1109/TBME.2009.2016573