Automatic detection and removal of fast phases from nystagmographic recordings by optimal thresholding |
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Authors: | S Faucheux B Schwaller A Buizza |
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Institution: | aInstitut de Mécanique des Fluides et des Solides de Strasbourg, Université Louis Pasteur de Strasbourg, UMR 7507 ULP/CNRS, 2 rue Boussingault, F-67000 Strasbourg, France;bDipartimento di Informatica e Sistemistica, Università degli Studi di Pavia, via Ferrata 1, I-27100 Pavia PV, Italy |
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Abstract: | Recording of ocular nystagmus during vestibular tests does not measure the true response of the vestibulo-ocular reflex (VOR), because the VOR response (so-called slow phase of nystagmus) is interrupted by resetting saccades (so-called fast phase of nystagmus). In order to extract the real VOR contribution, saccades must be removed. In most of the nystagmus processing algorithms, saccade removal requires a human operator to choose a suitable eye velocity threshold able to separate fast from slow nystagmus phases. In the present report a fully automatic removal system is presented which selects an optimal velocity threshold by computing the VOR frequency response and maximizing its coherence function. |
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Keywords: | Vestibulo-ocular reflex Nystagmus analysis Phase detection Coherence function Optimisation |
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