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Volume Reduction Techniques for the Classification of Independent Components of rs-fMRI Data: a Study with Convolutional Neural Networks

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Abstract

In the last decade, neurosciences have had an increasing interest in resting state functional magnetic resonance imaging (rs-fMRI) as a result of its advantages, such as high spatial resolution, compared to other brain exploration techniques. To improve the technique, the elimination of artifacts through Independent Components Analysis (ICA) has been proposed, as this can separate neural signal and noise, opening possibilities for automatic classification. The main classification techniques have focused on processes based on typical machine learning. However, there are currently more robust approaches such as convolutional neural networks, which can deal with complex problems directly from the data without feature selection and even with data that does not have a simple interpretation, being limited by the amount of data necessary for training and its high computational cost. This research focused on studying four methods of volume reduction mitigating the computational cost for the training of 3 models based on convolutional neural networks. One of the reduction techniques is a novel approach that we call Reduction by Consecutive Binary Patterns (RCBP), which was shown to preserve the spatial features of the independent components. In addition, the RCBP showed networks in components associated with neuronal activity more clearly. The networks achieved accuracy above 98 % in classification, and one network was even found to be over 99 % accurate, outperforming most machine learning-based classification algorithms.

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Acknowledgements

This work was supported by Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) for the ‘Identificación de Biomarcadores Preclínicos en Enfermedad de Alzheimer a través de un Seguimiento Longitudinal de la Actividad Eléctrica Cerebral en Poblaciones con Riesgo Genético’ [project, code 111577757635]; and the Vicerrectoría de investigación de la Universidad de Antioquia.

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ServioLeonel Mera Jiménez: Term, Conceptualization, Methodology, Software,Formal analysis, Investigation, Resources, Data Curation, Writing – OriginalDraft, Visualization. John Fredy Ochoa Gómez: Writing - Review &Editing, Supervision, Project administration, Funding acquisition.

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Correspondence to Leonel Mera Jiménez.

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 The authors declare that they have no known competingfinancial interests or personal relationships that could have appeared toinfluence the work reported in this paper.

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Mera Jiménez, L., Ochoa Gómez, J.F. Volume Reduction Techniques for the Classification of Independent Components of rs-fMRI Data: a Study with Convolutional Neural Networks. Neuroinform 20, 73–90 (2022). https://doi.org/10.1007/s12021-021-09524-9

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  • DOI: https://doi.org/10.1007/s12021-021-09524-9

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