9 documents found, page 1 of 1

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Carta ao Editor / Carta Resposta Editor

Manaças, Rui; Donato, Paulo

Carta Editor No último número da Acta Radiológica Portuguesa o seu artigo de introdução sobre o tema da revista – “A subespecialização em Radiologia/Subespecialização em Radiologia de Intervenção” suscita alguns comentários da minha parte, enquanto membro cessante da actual Direcção do Colégio de Neurorradiologia da Ordem dos Médicos e presidente da Sociedade Portuguesa de Neurorradiologia Diagnóstica e Terapêu...

Date: 2021   |   Origin: Acta Radiológica Portuguesa

Physiological effect of caffeine in neurological studies based on Susceptibilit...

Caseiro, Ana Rita; Sousa, Paulo; Manaças, Rui; Pereira, Pedro M. Gonçalves

Introduction – The present study investigates the effect of caffeine on the contrast-to-noise ratio (CNR) in SWI images. Purpose – Data analyses included qualitative and quantitative measures, specifically the CNR pre and post-ingestion, in magnitude and MIP images. The structures evaluated were the internal cerebral vein, superior sagital sinus, torcula, and middle cerebral artery. Methodology – Twenty-four he...

Date: 2014   |   Origin: Saúde & Tecnologia

Structural connectivity of the brain: differences between a normal brain and a ...

Ferra, Carmen; Ferreira, Hugo Alexandre; Pereira, Pedro M. Gonçalves; Manaças, Rui; Andrade, Alexandre

Understanding the large-scale structural network formed by neurons is a major challenge in neuroscience. In this study, we analyzed the structural connectivity of the human brain in 22 healthy subjects and in two patients with post-traumatic epilepsy. We evaluated the differences between these two groups. We also investigated differences in connectivity regarding gender and age in healthy individuals. For this ...

Date: 2014   |   Origin: Saúde & Tecnologia

Conectividade estrutural do cérebro: diferenças entre um cérebro normal e um cé...

Ferra, Carmen; Ferreira, Hugo Alexandre; Gonçalves Pereira, Pedro; Manaças, Rui; Andrade, Alexandre

Perceber a rede estrutural formada pelos neurónios no cérebro a nível da macro escala é um desafio atual na área das neurociências. Neste estudo analisou-se a conectividade estrutural do cérebro em 22 indivíduos saudáveis e em dois doentes com epilepsia pós-traumática. Avaliaram-se as diferenças entre estes dois grupos. Também se pesquisaram diferenças a nível do género e idade no grupo de indivíduos saudáveis ...


Efeito fisiológico da cafeína em estudos neurológicos com base na ponderação em...

Caseiro, Ana Rita; Sousa, Paulo; Manaças, Rui; Gonçalves Pereira, Pedro

Introdução – O presente estudo avaliou o efeito da cafeína no valor da razão contraste ruído (CNR) em imagens SWI. Objetivos – Avaliar o efeito da cafeína qualitativamente e quantificado pelo cálculo do valor CNR em imagens de magnitude e MIP para as estruturas: veia cerebral interna, seio sagital superior, tórcula e artéria cerebral média. Metodologia – A população do estudo incluiu 24 voluntários saudáveis qu...


Pre-operative tractography of the facial nerve in vestibular schwannomas: inter...

Gonçalves Pereira, Pedro; Neto d'Almeida, G.; Escada, P.; Manaças, Rui; Taoka, T.

Pre-operative diffusion tensor (DT) tractography is currently employed in our institutions. We use it to predict the course of the facial nerve (FN) in the vicinity of vestibular schwannomas (VS) of the cerebellopontine angle (CPA). In this study we were interested to assess the inter-observer reproducibility of this method. Two Neuroradiologists (PMGP and TT) determined independently the location of the FN by ...


Physiologic effect of caffeine on susceptibility-weighted imaging

Gonçalves Pereira, Pedro; Caseiro, Ana Rita; Sousa, Paulo; Manaças, Rui

Susceptibility-weighted imaging (SWI) is a relatively new contrast in MR imaging. Previous studies have found an effect of caffeine in the contrast generated by SWI images. The present study investigates the effect of caffeine on contrast-to-noise ratio (CNR) in SWI.


Surgical proven location of the facial nerve in the vicinity of cerebellopontin...

Gonçalves Pereira, Pedro; Neto d'Almeida, G.; Manaças, Rui; Escada, P.; Taoka, T.

Purpose/Introduction: To determine the clinical utility of pre-operative diffusion tensor (DT) tractography of the facial nerve in the vicinity of cerebellopontine angle (CPA) tumours. The location of the facial nerve was established pre-operatively by tractography and compared with in-vivo electrode stimulation during microsurgery of vestibular schwannomas and rare CPA masses (meningiomas and arachnoid cysts).


Cerebral venous thrombosis imagiologic features in a pregnant woman.

Ferreira, Maria Madalena; Rios, Ana Cristina; Fragata, Isabel; Baptista, José Tiago; Manaças, Rui; Reis, João

Cerebral venous thrombosis (CVT) is a relatively rare but serious condition potentially reversible upon accurate diagnosis and adequate therapy. The peri-partum state and pregnancy are predisposing factors and TVC accounts for about 6% of maternal deaths. Its clinical symptoms depend on the the thrombus site and extension, and also on the existing collateral vessels network. We present the case of a 33 year-old...

Date: 2011   |   Origin: Acta Médica Portuguesa

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