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Abstract #2708

Acoustic Noise Control During Auditory FMRI Using a DSP System - First Initial in vivo Results

Daniel Gllmar1, Markus Hdrich1, 2, Jrgen R. Reichenbach1

1Medical Physics Group / IDIR I, Jena University Hospital, Jena, Thuringia, Germany; 2University of Applied Sciences Jena, Jena, Thuringia, Germany

We implemented a template driven active noise cancellation algorithm on a DSP system in order to attenuate the acoustic noise which accompanies especially fmri acquisitions. Employing acoustic stimuli, we found that stopping filter adaptation during stimulus presentation yields to much better activation in terms of HRF amplitude in the auditory cortex, whereas without noise control at all, no activation was detected in the auditory cortex, although the stimuli were detected.

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Keywords

able acoustic acoustical activating activation active adaptation adapting addition adjusted amplitude amplitudes application applied approx arrows aspects asymmetry attenuates attenuation auditory board body bold bullock cancellation chambers channel coefficients compatible consequence continuous continuously contrast control controlled cortex currently detect developed developer developments directly driven duration effectiveness employed enhance evaluate evaluated event exclude experiment filter finding fitted foster frequency future generated graph hall headphone headset hemispheric hospital implemented in vivo independently initial inter interference interrupted interval just leaky least lite material matrix medical microphones neither noise normalization normalized occurrence optical optimizes palmer pattern pausing performances physics presentation previously procedure procedures processed promising psychophysical publications quickly random rare real realign recently reduction reflect registration related reported responses self sending slice slow smoothing society software sound source spatial squares starting statistical stimulation stimuli stimulus stopped stopping substantially summarize switching system systems technology template third threshold tone tool trial trio twice unable upper vector view volunteer whole