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	Provedor de dados BJMBR (2) Autor Avelar,W.M. (2) Li,L.M. (2) Beltramini,G.C. (1) Castellano,G. (1) Fernandes,P.T. (1) Herrera Campos,C.R. (1) Lima,F.O. (1) Oliveira,M.S. (1) Santos,S.L.M. (1) Mais... Palavra-chave Blood oxygen level dependence (1) Carotid stenosis (1) Computed tomography (1) Discriminant analysis (1) Texture analysis (1) Thrombolysis (1) Transcranial Doppler (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2016 (1) 2009 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Cerebral vasomotor reactivity assessment using Transcranial Doppler and MRI with apnea test BJMBR Herrera Campos,C.R.; Beltramini,G.C.; Avelar,W.M.; Lima,F.O.; Li,L.M.. Differently from previous studies that used Transcranial Doppler (TCD) and functional MRI (fMRI) for cerebral vasomotor reactivity (CVR) assessment in patients with carotid stenosis (CS), we assessed CVR using an identical stimulus, the Breath-Holding Test (BHT). We included 15 patients with CS and 7 age-matched controls to verify whether fMRI responded differently to BHT between groups and to calculate the agreement rate between tests. For TCD, impaired CVR was defined when the mean percentage increase on middle cerebral artery velocities was ≤31% on 3 consecutive 30-s apnea intercalated by 4-min normal breathing intervals. For fMRI, the percent variation on blood oxygen level-dependent (BOLD) signal intensity in the lentiform nucleus (LN) ipsilateral to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Blood oxygen level dependence; Transcranial Doppler; Carotid stenosis. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016001100704 Texture analysis of computed tomography images of acute ischemic stroke patients BJMBR Oliveira,M.S.; Fernandes,P.T.; Avelar,W.M.; Santos,S.L.M.; Castellano,G.; Li,L.M.. Computed tomography (CT) images are routinely used to assess ischemic brain stroke in the acute phase. They can provide important clues about whether to treat the patient by thrombolysis with tissue plasminogen activator. However, in the acute phase, the lesions may be difficult to detect in the images using standard visual analysis. The objective of the present study was to determine if texture analysis techniques applied to CT images of stroke patients could differentiate between normal tissue and affected areas that usually go unperceived under visual analysis. We performed a pilot study in which texture analysis, based on the gray level co-occurrence matrix, was applied to the CT brain images of 5 patients and of 5 control subjects and the results were... Tipo: Info:eu-repo/semantics/article Palavras-chave: Texture analysis; Computed tomography; Thrombolysis; Discriminant analysis. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001100012 Registros recuperados: 2 Primeira ... 1 ... Última

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