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(Referência obtida automaticamente do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Support vector machine-based classification of neuroimages in Alzheimer’s disease: direct comparison of FDG-PET, rCBF-SPECT and MRI data acquired from the same individuals

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Luiz K. Ferreira ; Jane M. Rondina ; Rodrigo Kubo ; Carla R. Ono ; Claudia C. Leite ; Jerusa Smid ; Cassio Bottino ; Ricardo Nitrini ; Geraldo F. Busatto ; Fabio L. Duran ; Carlos A. Buchpiguel
Número total de Autores: 11
Tipo de documento: Artigo Científico
Fonte: Revista Brasileira de Psiquiatria; v. 40, n. 2, p. -, Jun. 2018.
Resumo

Objective: To conduct the first support vector machine (SVM)-based study comparing the diagnostic accuracy of T1-weighted magnetic resonance imaging (T1-MRI), F-fluorodeoxyglucose-positron emission tomography (FDG-PET) and regional cerebral blood flow single-photon emission computed tomography (rCBF-SPECT) in Alzheimer’s disease (AD). Method: Brain T1-MRI, FDG-PET and rCBF-SPECT scans were acquired from a sample of mild AD patients (n=20) and healthy elderly controls (n=18). SVM-based diagnostic accuracy indices were calculated using whole-brain information and leave-one-out cross-validation. Results: The accuracy obtained using PET and SPECT data were similar. PET accuracy was 68∼71% and area under curve (AUC) 0.77∼0.81; SPECT accuracy was 68∼74% and AUC 0.75∼0.79, and both had better performance than analysis with T1-MRI data (accuracy of 58%, AUC 0.67). The addition of PET or SPECT to MRI produced higher accuracy indices (68∼74%; AUC: 0.74∼0.82) than T1-MRI alone, but these were not clearly superior to the isolated neurofunctional modalities. Conclusion: In line with previous evidence, FDG-PET and rCBF-SPECT more accurately identified patients with AD than T1-MRI, and the addition of either PET or SPECT to T1-MRI data yielded increased accuracy. The comparable SPECT and PET performances, directly demonstrated for the first time in the present study, support the view that rCBF-SPECT still has a role to play in AD diagnosis. (AU)

Processo FAPESP: 04/05551-6 - Correlação cintilográfica entre SPECT cerebral e tomografia por emissão de pósitrons (PET) no diagnóstico diferencial das demências
Beneficiário:Carlos Alberto Buchpiguel
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/50329-6 - Neurociência translacional da doença de Alzheimer: estudos pré-clínicos e clínicos do peptídeo b-amiloide e outros biomarcadores
Beneficiário:Geraldo Busatto Filho
Linha de fomento: Auxílio à Pesquisa - Temático