Examinando por Materia "Alineamiento procrustes"

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    Patrones espacio–acústicos en sonidos respiratorios multicanal : integración de procrustes, clustering y modelos supervisados en pacientes con EPOC
    (Universidad EAFIT, 2025-03-03) Escobar Pajoy, Sebastián; Fonseca Valero, Diego Fernando
    Auscultation is a fundamental tool for assessing respiratory conditions; however, its interpretation is limited by examiner subjectivity and by the strong influence that recording location exerts on the acoustic properties of lung sounds. This work proposes a multichannel analysis strategy aimed at characterizing the spatial organization of respiratory sounds in patients with COPD and evaluating the relative contribution of different thoracic regions to the detection of adventitious events. Using simultaneous recordings from seven chest locations in the ICBHI 2017 dataset, a collection of respiratory segments was constructed and described through spectral and cepstral features. Multichannel configurations were projected into low dimensional spaces and aligned using Procrustes analysis, enabling comparable geometric representations across subjects and breathing cycles. An unsupervised clustering scheme applied to these representations revealed recurrent spatial patterns associated with different distributions of wheezes and crackles. In addition, supervised Random Forest models were trained for adventitious sound detection, incorporating feature-importance analyses and channel-ablation experiments to examine the contribution of each thoracic region. The results indicate that multichannel spatial information contains structured patterns that can be leveraged both to group thoracic configurations and to enhance the interpretability of classification models, contributing to more robust and explainable representations of pulmonary acoustics