Avaliação da dinâmica normal da circulação do meio de contraste em estruturas vasculares nos exames de tomografia computadorizada das artérias coronárias

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ciências da Saúde, Programa de Pós-Graduação em Ciências da Saúde, 2015.Introdução: O uso de agentes de contraste intravenoso é corriqueiro em pacientes submetidos à tomografia computadorizada (TC) de tórax. Sabe-se que o tempo de trânsito de contraste (TTC) do sítio de injeção até a circulação sistêmica tem relação com o débito cardíaco e pode trazer importantes informações funcionais, pouco estudadas até o momento. Objetivos: Medir o TTC entre o tronco pulmonar e aorta ascendente em exames de TC de artérias coronárias de pacientes saudáveis, definindo padrões de normalidade para estes tempos de circulação. Métodos: Pacientes ambulatoriais sadios encaminhados para realização de TC de artérias coronárias arrolados de forma consecutiva. Os TTC entre o sítio de injeção e a veia cava superior, tronco pulmonar e aorta ascendente foram medidos com base nas imagens de monitorização (bolus tracking). O débito cardíaco foi calculado a partir das imagens da TC pelo método geométrico e correlacionado com os TTC. Resultados: Foram analisados 18 pacientes. O TTC médio entre a artéria pulmonar e a aorta ascendente foi de 6,8 ± 1,6s. Não houve correlação significativa entre o TTC na circulação pulmonar e o débito cardíaco medido pelo método geométrico. Conclusão: O valor de normalidade do TTC entre a artéria pulmonar e aorta ascendente foi estabelecido, servindo de base para avaliação clínica.Introduction: The use of contrast agents is a common radiological practice in chest tomography (CT) examinations. It’s known that the transit time of the contrast agent (TTC) between the injection site and the systemic circulation is related to the cardiac output and can add important functional information. Nevertheless, there is little information regarding the normal transit times. Objectives: Measure the TTC between main pulmonary artery and ascending aorta in coronary artery CT’s of healthy patients, defining the normality values for such circulatory times. Methods: Healthy ambulatorial patients who underwent coronary artery CT were included. The TTC’s between the injection site and inferior vena cava, main pulmonary artery and ascending aorta were measured using the bolus tracking images. The cardiac output was measured from the CT images using the geometric method. Results: 18 patients were included in the analysis. The mean TTC between the mean pulmonary artery and aorta was 6,8 ± 1,6s. There was no significant correlation between the TTC and cardiac output measured by the geometric method. Conclusion: The normal value for the TTC between main pulmonary artery and ascending aorta was determined, and can be used as a reference for future publications

Amazonia Camtrap: a data set of mammal, bird, and reptile species recorded with camera traps in the Amazon forest.

Abstract : The Amazon forest has the highest biodiversity on Earth. However, information on Amazonian vertebrate diversity is still deficient and scatteredacross the published, peer-reviewed, and gray literature and in unpublishedraw data. Camera traps are an effective non-invasive method of surveying vertebrates, applicable to different scales of time and space. In this study, we organized and standardized camera trap records from different Amazonregions to compile the most extensive data set of inventories of mammal,bird, and reptile species ever assembled for the area. The complete data setcomprises 154,123 records of 317 species (185 birds, 119 mammals, and13 reptiles) gathered from surveys from the Amazonian portion of eightcountries (Brazil, Bolivia, Colombia, Ecuador, French Guiana, Peru,Suriname, and Venezuela). The most frequently recorded species per taxawere: mammals:Cuniculus paca (11,907 records); birds: Pauxi tuberosa (3713 records); and reptiles:Tupinambis teguixin(716 records). The infor-mation detailed in this data paper opens up opportunities for new ecological studies at different spatial and temporal scales, allowing for a moreaccurate evaluation of the effects of habitat loss, fragmentation, climatechange, and other human-mediated defaunation processes in one of themost important and threatened tropical environments in the world. The data set is not copyright restricted; please cite this data paper when usingits data in publications and we also request that researchers and educator sinform us of how they are using these data

Osirix^TM as a feasible tool for in office manual hippocampal volumetry in the elderly: a technical note

INTRODUCTION: Manual tracing is an effective method to measure hippocampal volume. OsiriXTM is a Digital Imaging and Communications in Medicine (DICOM) viewer with an intuitive user interface that has been widely used by radiologists and other specialists in their daily practice. OBJECTIVE: To describe OsiriXTM, a tool for in office manual measurement of hippocampal volume. METHODS: The open-source OsiriXTM viewer was used with three dimensions (3D) T1 weighted spoiled gradient recalled echo (SPGR) sequence images, with 1 mm slice thickness and 0.1mm gap (voxel size 1 mm3). Magnetic Resonance Imagings (MRI) were obtained on a 1.5 T system. The entire procedure lasted less than 15 minutes for each hippocampus. CONCLUSION: OsiriXTM viewer is a feasible tool for in office manual hippocampal measurement. There is no standard hippocampal volume for Alzheimer's disease, thus comparison could be regarded as the rate of hippocampal atrophy over time, correlated with clinical evaluation and cognitive tests.</p

AMAZONIA CAMTRAP: A data set of mammal, bird, and reptile species recorded with camera traps in the Amazon forest

The Amazon forest has the highest biodiversity on Earth. However, information on Amazonian vertebrate diversity is still deficient and scattered across the published, peer-reviewed, and gray literature and in unpublished raw data. Camera traps are an effective non-invasive method of surveying vertebrates, applicable to different scales of time and space. In this study, we organized and standardized camera trap records from different Amazon regions to compile the most extensive data set of inventories of mammal, bird, and reptile species ever assembled for the area. The complete data set comprises 154,123 records of 317 species (185 birds, 119 mammals, and 13 reptiles) gathered from surveys from the Amazonian portion of eight countries (Brazil, Bolivia, Colombia, Ecuador, French Guiana, Peru, Suriname, and Venezuela). The most frequently recorded species per taxa were: mammals: Cuniculus paca (11,907 records); birds: Pauxi tuberosa (3713 records); and reptiles: Tupinambis teguixin (716 records). The information detailed in this data paper opens up opportunities for new ecological studies at different spatial and temporal scales, allowing for a more accurate evaluation of the effects of habitat loss, fragmentation, climate change, and other human-mediated defaunation processes in one of the most important and threatened tropical environments in the world. The data set is not copyright restricted; please cite this data paper when using its data in publications and we also request that researchers and educators inform us of how they are using these data