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Differentiation between Parkinson disease and other forms of Parkinsonism using support vector machine analysis of susceptibility-weighted imaging (SWI): initial results

Haller, S. ; Badoud, S. ; Nguyen, D. ; Barnaure, I. ; Montandon, M-L ; Lovblad, K-O ; Burkhard, PR

In: European Radiology, 2013, vol. 23, no. 1, p. 12-19

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    Titre
    • Differentiation between Parkinson disease and other forms of Parkinsonism using support vector machine analysis of susceptibility-weighted imaging (SWI): initial results
    Auteur
    • Haller, S.. Service neuro-diagnostique et neuro-interventionnel DISIM, Hôpitaux Universitaires de Genève, Rue Gabrielle Perret-Gentil 4, 1211, Genève 14, Switzerland
    • Badoud, S.. Department of Neurology, Geneva University Hospitals, Geneva, Switzerland
    • Nguyen, D.. Centre Diagnostic Radiologique Carouge, 1b Clos de la Fonderie, 1227, Carouge, Switzerland
    • Barnaure, I.. Service de Radiologie, Geneva University Hospitals, Geneva, Switzerland
    • Montandon, M-L. Nuclear medicine and molecular imaging unit, DISIM, Geneva University Hospitals, Geneva, Switzerland
    • Lovblad, K-O. Service neuro-diagnostique et neuro-interventionnel DISIM, Hôpitaux Universitaires de Genève, Rue Gabrielle Perret-Gentil 4, 1211, Genève 14, Switzerland
    • Burkhard, PR. Department of Neurology, Geneva University Hospitals, Geneva, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:319231
    Summary
    Objectives: To diagnose Parkinson disease (PD) at the individual level using pattern recognition of brain susceptibility-weighted imaging (SWI). Methods: We analysed brain SWI in 36 consecutive patients with Parkinsonism suggestive of PD who had (1) SWI at 3T, (2) brain 123I-ioflupane SPECT and (3) extensive neurological testing including follow-up (16 PD, 67.4 ± 6.2years, 11 female; 20 OTHER, a heterogeneous group of atypical Parkinsonism syndromes 65.2 ± 12.5years, 6 female). Analysis included group-level comparison of SWI values and individual-level support vector machine (SVM) analysis. Results: At the group level, simple visual analysis yielded no differences between groups. However, the group-level analyses demonstrated increased SWI in the bilateral thalamus and left substantia nigra in PD patients versus other Parkinsonism. The inverse comparison yielded no supra-threshold clusters. At the individual level, SVM correctly classified PD patients with an accuracy above 86%. Conclusions: SVM pattern recognition of SWI data provides accurate discrimination of PD among patients with various forms of Parkinsonism at an individual level, despite the absence of visually detectable alterations. This pilot study warrants further confirmation in a larger cohort of PD patients and with different MR machines and MR parameters. Key Points: • Magnetic resonance imaging data offers new insights into Parkinson's disease • Visual susceptibility-weighted imaging (SWI) analysis could not discriminate idiopathic from atypical PD • However, support vector machine (SVM) analysis provided highly accurate detection of idiopathic PD • SVM analysis may contribute to the clinical diagnosis of individual PD patients • Such information can be readily obtained from routine MR data