14 documents found, page 1 of 2
Influence of the color scale in qualitative assessment of myocardial perfusion ...
Figueiredo, Andreia; Ramos, Emília; Carolino, Elisabete; Vaz, Tânia; Vieira, LinaIntroduction – Myocardial perfusion imaging (MPI) is a widely accepted study applied in the diagnosis and follow-up of coronary artery disease. Interpretation of myocardial perfusion images requires visual analysis of the reconstructed slices. The color scale selected can have a significant effect on the final appearance of the image and on the clinical interpretation of myocardial perfusion. Aim – Evaluate the...
Relative renal function estimate by renal scintigraphy with 99mTc-DMSA: influen...
Amaro, Andreia; Silva, H.; Santos, A. I.; Carolino, Elisabete; Vaz, Tânia; Vieira, LinaIntroduction – The estimate of relative renal function (RRF) through scintigraphy with dimercaptosuccinic acid labeled with Technetium-99 metastable (99mTc-DMSA) may be influenced by kidney depth (KD), due to attenuation by soft tissue surrounded kidneys. Considering that rarely this KD is known, several methods for attenuation correction (AC) have been developed, namely those using empirical formulae, such as ...
18FDG PET/CT in the qualitative and quantitative evaluation of the therapeutic ...
Martins, Nuno; Hunter, James; Vaz, Tânia; Dizdarevic, Sabina
Influência da escala de cores na avaliação qualitativa das imagens de cintigraf...
Figueiredo, Andreia; Ramos, Emília; Carolino, Elisabete; Vaz, Tânia; Vieira, LinaIntrodução – A cintigrafia de perfusão do miocárdio (CPM) é utilizada no diagnóstico e seguimento de pacientes com doença arterial coronária, sendo a sua avaliação frequentemente realizada através da análise visual dos cortes tomográficos. A escala de cores selecionada é essencial na interpretação clínica das imagens de perfusão do miocárdio. Objetivo – Avaliar a influência de diferentes escalas de cores na ava...
Imaging in neurological and vascular brain diseases (SPECT and SPECT/CT)
Lucena, Filipa; Sousa, Eva; Vaz, TâniaSince the first in vivo studies of cerebral function with radionuclides by Ingvar and Lassen, nuclear medicine (NM) brain applications have evolved dramatically, with marked improvements in both methods and tracers. Consequently it is now possible to assess not only cerebral blood flow and energy metabolism but also neurotransmission. Planar functional imaging was soon substituted by single-photon emission comp...
Influência dos métodos de correção de atenuação na quantificação da função rena...
Amaro, Andreia; Silva, H.; Santos, A. I.; Carolino, Elisabete; Vaz, Tânia; Vieira, LinaIntrodução – A estimativa da função renal relativa (FRR) através de cintigrafia renal (CR) com ácido dimercaptossuccínico marcado com tecnécio-99 metaestável (99mTc-DMSA) pode ser influenciada pela profundidade renal (PR), atendendo ao efeito de atenuação por parte dos tecidos moles que envolvem os rins. Dado que raramente é conhecida esta mesma PR, diferentes métodos de correção de atenuação (CA) foram desenvo...
Assessment of the quality of brain regions and neuroimaging metrics as biomarke...
Vaz, Tânia; Lucena, Filipa; Pé-Leve, Joana; Ribeiro, André Santos; Lacerda, Luís; Silva, Nuno da; Nutt, David; McGonigle, John; Ferreira, Hugo AlexandreAlzheimer Disease (AD) is characterized by progressive cognitive decline and dementia. Earlier diagnosis and classification of different stages of the disease are currently the main challenges and can be assessed by neuroimaging. With this work we aim to evaluate the quality of brain regions and neuroimaging metrics as biomarkers of AD. Multimodal Imaging Brain Connectivity Analysis (MIBCA) toolbox functionalit...
Nuclear medicine technologist education and training in Europe: literature and ...
Matos, Ana C.; Massa, Raquel C.; Lucena, Filipa; Vaz, TâniaPurpose - The education and training of a nuclear medicine technologist (NMT) is not homogeneous among European countries, which leads to different scope of practices and, therefore, different technical skills are assigned. The goal of this research was to characterize the education and training of NMT in Europe. Materials and methods - This study was based on a literature research to characterize the education...
Monte Carlo simulation of the basic features of the GE Millennium MG single pho...
Vieira, Lina; Vaz, Tânia; Costa, Durval C.; Almeida, P.Objective - To describe and validate the simulation of the basic features of GE Millennium MG gamma camera using the GATE Monte Carlo platform. Material and methods - Crystal size and thickness, parallel-hole collimation and a realistic energy acquisition window were simulated in the GATE platform. GATE results were compared to experimental data in the following imaging conditions: a point source of 99mTc at di...
Avaliação do desempenho de um sistema híbrido de tomografia por emissão de posi...
Vaz, TâniaO equipamento híbrido de Tomografia por Emissão de Positrões e Tomografia Computorizada (PET/CT, acrónimo inglês de Positron Emission Tomography/Computed Tomography) tem tido na última década um impacto crescente na imagiologia médica. Muitas das investigações e aplicações clínicas de PET/CT baseiam-se na quantificação, que é altamente dependente das características de desempenho da instrumentação e da precisão...