Decomposition of biomedical signals in spatial and time-frequency modes

Methods of Information in Medicine
M GratkowskiF Zanow

Abstract

The purpose of this paper is to introduce a new method for spatial-time-frequency analysis of multichannel biomedical data. We exemplify the method for data recorded with a 31-channel Philips biomagnetometer. The method creates approximations and decompositions of spatiotemporal signal distributions using elements (atoms) chosen from a very large and redundant set (dictionary). The method is based on the Matching Pursuit algorithm, but it uses atoms that are distributed both in time and space (instead of only time-distributed atoms in standard Matching Pursuit). The time-frequency distribution of signal components is described by Gabor atoms and their spatial distribution is modeled by spatial modes. The spatial modes are created with the help of Bessel functions. Two versions of the method, differing in the definition of spatial properties of the atoms, are presented. The technique was validated on simulated data and real magnetic field data. It was used for removal of powerline noise from multichannel magnetoencephalography data, extraction of high-frequency somatosensory evoked fields and for separation of partially overlapping T- and U-waves in magnetocardiography. The method allows for parameterization of multichannel data...Continue Reading

Citations

Nov 1, 2011·Experimental Brain Research·Line Lindhardt EgsgaardLars Arendt-Nielsen
Nov 3, 2011·Experimental Brain Research·Line Lindhardt EgsgaardLars Arendt-Nielsen
May 12, 2009·Journal of Neuroscience Methods·Christian G BénarMaureen Clerc
Nov 19, 2013·Neuromodulation : Journal of the International Neuromodulation Society·Dejan Ristić, Jens Ellrich
Feb 23, 2013·Journal of Neuroscience Methods·Q BarthélemyJ I Mars
Feb 23, 2012·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Andreas HalbleibJens Haueisen
Jan 23, 2017·Biological cybernetics·Paweł KordowskiCezary Sielużycki

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