An active noise cancellation system for fMRI
Journal
Proc. of 2007 Joint Meet. of the 6th Int. Symp. on Noninvasive Functional Source Imaging of the Brain and Heart and the Int. Conf. on Functional Biomedical Imaging, NFSI and ICFBI 2007
Pages
265-267
Date Issued
2007
Author(s)
Abstract
MRI acoustic noise could be high up to 120dB while acquiring images with high speed echo planar imaging (EPI). It reaches the hearing limit of human and also impedes the research of functional MRI. In this research, an active noise cancellation (ANC) system was implemented using a Filtered-x recursive leastsquare (FXRLS) Alter and combined with passive noise cancellation to reduce the noise from EPI. Further, the visual fMRI experiments were performed with and without the ANC system. Our results showed extra 9.4 dB reduction was obtained by active noise cancellation at the main frequency of EPI noise. Besides, the fMRI results showed 140% activated pixel numbers increased. © 2007 IEEE.
Type
conference paper