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Análise de dados de ressonância magnética funcional utilizando o algoritmo de agrupamento
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ISBN10: 6208834341
ISBN13: 9786208834340
Publisher: Edicoes Nosso Conhecimento
Published: Jul 11 2025
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208834340
Publisher: Edicoes Nosso Conhecimento
Published: Jul 11 2025
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: Portuguese
A utilização de informação contextual foi estudada para a análise de dados de fMRI. A abordagem consistiu em duas fases: cálculo de um mapa estatÃstico paramétrico e deteção de ativação por clustering contextual. O algoritmo de clustering iterativo apresentado neste trabalho é baseado no algoritmo ICM de Besag. A nossa contribuição foi aplicar e avaliar o ICM no contexto de testes de hipóteses e mapas estatÃsticos paramétricos. Os resultados indicam que o poder do algoritmo contextual desenvolvido é superior ao da limiarização convencional voxel a voxel de um mapa estatÃstico paramétrico. Embora tenham sido utilizados dados de fMRI para testar o algoritmo, a construção do algoritmo é geral e pode ser utilizada para detetar objectos com distribuição desconhecida a partir de uma distribuição de fundo conhecida também noutros problemas semelhantes.
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