The relevance of feature selection methods to the classification of obsessive compulsive disorder based on volumetric measures

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art_TRAMBAIOLLI_The_relevance_of_feature_selection_methods_to_the_2017.PDF (631.59 KB)
Citações na Scopus
14
Tipo de produção
article
Data de publicação
2017
Editora
ELSEVIER SCIENCE BV
DOI
Indexadores
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Autores
TRAMBAIOLLI, Lucas R.
BIAZOLI JR., Claudinei E.
BALARDIN, Joana B.
SATO, Joao R.
Autor de Grupo de pesquisa
Editores
Coordenadores
Organizadores
Citação
JOURNAL OF AFFECTIVE DISORDERS, v.222, p.49-56, 2017
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Background: Magnetic resonance images (MRI) show detectable anatomical and functional differences between individuals with obsessive-compulsive disorder (OCD) and healthy subjects. Moreover, machine learning techniques have been proposed as tools to identify potential biomarkers and, ultimately, to support clinical diagnosis. However, few studies to date have investigated feature selection (FS) influences in OCD MRI-based classification. Methods: Volumes of cortical and subcortical structures, from MRI data of 38 OCD patients (split into two groups according symptoms severity) and 36 controls, were submitted to seven feature selection algorithms. FS aims to select the most relevant and less redundant features which discriminate between two classes. Then, a classification step was applied, from which the classification performances before and after different FS were compared. For the performance evaluation, leave-one-subject-out accuracies of Support Vector Machine classifiers were considered. Results: Using different FS algorithms, performance improvement was achieved for Controls vs. All OCD discrimination (19.08% of improvement reducing by 80% the amount of features), Controls vs. Low OCD (20.10%, 75%), Controls vs. High OCD (17.32%, 85%) and Low OCD vs. High OCD (10.53%, 75%). Furthermore, all algorithms pointed out classical cortico-striato-thalamo-cortical circuitry structures as relevant features for OCD classification. Limitations: Limitations include the sample size and using only filter approaches for FS. Conclusions: Our results suggest that FS positively impacts. OCD classification using machine-learning techniques. Complementarily, FS algorithms were able to select biologically plausible features automatically.
Palavras-chave
Magnetic resonance imaging, Machine learning, Obsessive-compulsive disorder, Feature selection
URI
https://observatorio.fm.usp.br/handle/OPI/22187
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Coleções
Artigos e Materiais de Revistas Científicas - LIM/21