Open AccessFuzzy‐entropy threshold based on a complex wavelet denoising technique to diagnose Alzheimer disease
Author(s) -
Lazar Prinza,
Jayapathy Rajeesh,
TorrentsBarrena Jordina,
Mol Beena,
Puig Domenec
Publication year - 2016
Publication title -
healthcare technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 19
ISSN - 2053-3713
DOI - 10.1049/htl.2016.0022
Subject(s) - wavelet , pattern recognition (psychology) , electroencephalography , artificial intelligence , computer science , fuzzy logic , noise reduction , entropy (arrow of time) , mean squared error , wavelet transform , mathematics , speech recognition , statistics , medicine , physics , quantum mechanics , psychiatry
The presence of irregularities in electroencephalographic (EEG) signals entails complexities during the Alzheimer's disease (AD) diagnosis. In addition, the uncertainty presented on EEG raises major issues in the improvement of the classification rate. The multi‐resolution analysis through an optimum threshold will likely achieve better results in distinguishing AD and normal EEG signals. Hence, a fuzzy‐entropy concept defined in a complex multi‐resolution wavelet has been proposed to obtain the most appropriate threshold. First, the complex coefficients are fuzzified using a Gaussian membership function. Afterwards, the ability of the proposed fuzzy‐entropy threshold has been compared with traditional thresholds in complex wavelet domain. Experimental results show that the authors’ methodology produces a higher signal‐to‐noise ratio and a lower root‐mean‐square error than traditional approaches. Moreover, a neural network scheme is performed along several features to classify AD from normal EEG signals obtaining a specificity of 87.5%.