Detecção automática de complexos-K no sinal EEG humano baseada em análise espectral multitaper.

• Autor(a) principal: OLIVEIRA, Gustavo Henrique Batista Santos
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFMA
• Texto Completo: https://tedebc.ufma.br/jspui/handle/tede/tede/2738
• topic: Eletroencefalograma; complexo-K; espectrograma multitaper; estudo do sono; análise espectral; Electroencephalogram; k-complex; multitaper spectrogram; sleep study; spectral analysis; Engenharia de Software.

In this work it is proposed a novel method for automatic k-complex (KC) detection in human sleep EEG, named MT-KCD. Like most methods, MT-KCD codifies some rules used by human experts such as KC characterization as 0-4 Hz waveform standing out from the background, with peak-to-peak amplitude ≥ 75 𝜇𝑉 and duration ≤ 2 seconds. The MT-KCD novelty when compared to existing methods is the usage of multitaper spectral analysis to characterize the KC as 0-4 Hz waveform standing out from the background. The EEG multitaper spectral analysis is a recntly proposed tecnique by researches as a complement to the traditional hypnogram to sleep staging. The MT-KCD consists in three phases: pre-processing, candidates extraction and candidates elimination. In pre-processing phase, EEG multitaper spectrogram is computed. In sequence, the multitaper spectrogram is used to identify regions where possible have KCs occurrences. Lastly, candidates waveform which satisfy duration and peak-to-peak amplitude criterias are marked as KC. MT-KCD was evaluated using a public KC database known as DREAMS. Results have shown that MT-KCD improves detection metrics, especially F1 and F2 scores (harmonic averages of recall and precision), when compared to existing methods. F1 and F2 scores of MT-KCD on DREAMS were greater than 75%, in most of the evaluation scenarios, outperforming other methods. In regards to recall and precision, MT-KCD is comparable to existing methods in recall and precision, but presenting a more balanced relation between these metrics (F1 and F2 scores).