Echo Detection
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Evaluation of pulmonary nodules by magnetic resonance imaging sequences: which sequence will replace computed tomography?
SUMMARY OBJECTIVE: This study aimed to determine the role of magnetic resonance imaging in minimizing radiation exposure, especially in the follow-up of pulmonary nodules. METHODS: Patients who applied to our hospital between April 2013 and August 2018 for various reasons and had lung-mediastinal dynamic magnetic resonance imaging and thoracic computed tom
Revista da Associação Médica Brasileira. Publicado em: 2022
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2. SPATIAL OUTLIERS DETECTION ALGORITHM (SODA) APPLIED TO MULTIBEAM BATHYMETRIC DATA PROCESSING
Abstract: The amount of data produced in an echosounder has increased dramatically with scanning systems such as multibeam echo sounders and interferometric sonars, providing a considerable improvement in the submerged terrain representation, especially when it comes to detecting hazardous objects to the navigator. However, the available processing algorithm
Bol. Ciênc. Geod.. Publicado em: 02/12/2019
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3. ROBUST METHODOLOGY FOR DETECTION OF SPIKES IN MULTIBEAM ECHO SOUNDER DATA
Abstract Currently, during the operation in shallow waters, scanning systems, such as multibeam systems, are capable of collecting thousands of points in a short time, promoting a greater coverage of the submerged bottom, with consequent increase in the detection capacity of objects. Although there has been an improvement in the accuracy of the depths collec
Bol. Ciênc. Geod.. Publicado em: 14/10/2019
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4. Improving acute demyelinating lesion detection: which T1-weighted magnetic resonance acquisition is more sensitive to gadolinium enhancement?
RESUMO No que se refere à necessidade de um método preciso e padronizado para a detecção de atividade inflamatória em esclerose múltipla (EM), diferentes aquisições de RM devem ser comparadas com objetivo de escolher a sequência mais sensível para a rotina clínica. Objetivo Comparar a sensibilidade das sequências ponderadas em T1 após a admini
Arq. Neuro-Psiquiatr.. Publicado em: 29/07/2019
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5. Modeling and FPGA-based implementation of an efficient and simple envelope detector using a Hilbert Transform FIR filter for ultrasound imaging applications
Abstract Introduction Although the envelope detection is a widely used method in medical ultrasound (US) imaging to demodulate the amplitude of the received echo signal before any back-end processing, novel hardware-based approaches have been proposed for reducing its computational cost and complexity. In this paper, we present the modeling and FPGA impleme
Res. Biomed. Eng.. Publicado em: 15/01/2018
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6. Ultrasonic method of microvibration detection: part II - additional processing method and applications
Abstract Introduction In the last 28 years, the scientific community has been using elastography to evaluate the mechanical properties of biological tissue. The aim of this work was the optimization of the UDmV method, presented in Part I of the series, by means of modifying the technique employed to generate the reference sine and cosine functions, used fo
Res. Biomed. Eng.. Publicado em: 17/08/2017
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7. Effect of scanner acoustic background noise on strict resting-state fMRI
Functional MRI (fMRI) resting-state experiments are aimed at identifying brain networks that support basal brain function. Although most investigators consider a ‘resting-state’ fMRI experiment with no specific external stimulation, subjects are unavoidably under heavy acoustic noise produced by the equipment. In the present study, we evaluated the influ
Braz J Med Biol Res. Publicado em: 12/04/2013
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8. Echovirus 30 associated with cases of aseptic meningitis in state of Pará, Northern Brazil
Investigation of the aetiology of viral meningitis in Brazil is most often restricted to cases that occur in the Southern and Southeastern Regions; therefore, the purpose of this study is to describe the viral meningitis cases that occurred in state of Pará, Northern Brazil, from January 2005-December 2006. The detection of enterovirus (EV) in cerebrospinal
Memórias do Instituto Oswaldo Cruz. Publicado em: 2009-05
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9. Comparação entre as técnicas de dacriocistografia por ressonância magnética e por raios X no diagnóstico da obstrução das vias lacrimais / Comparison between magnetic resonance and x-ray dacryocystography in the evaluation of the obstruction of the lacrimal apparatus
Epiphora is the hyperlachrymation related to an obstruction of the lachrymal drainage system. In such cases, the treatment is frequently surgical and the definition of the nature and level of obstruction demands imaging methods. Magnetic Resonance Imaging (MRI) may play a role in this issue. Objectives: Evaluate the efficacy of MR dacryocystography in the ob
Publicado em: 2008
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10. Sistema multicanal de geração e recepção de ondas ultra-sonicas para transdutor matricial linear / Multichannel system for generation and detection of ultrasonic waves with a linear array transducer
Ultrasound in medicine has gone through great evolution in the last few decades and has occupied important position as a tool for therapy and diagnosis. This is due to the ultrasound equipment be of relatively low-cost, ultrasound is a non-ionizing radiation, is a non-invasive imaging method, and the images are created and seen in real time. It is common the
Publicado em: 2006
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11. Medição de múltiplas fases de nível de líquidos usando filtro adaptativo: técnicas, métodos e simulações / Measurement of multiple phases of level of liquids using adaptativo filter: techniques, methods and simulation
A medição de nível, além das aplicações em reservatórios de processos industriais, como nas indústrias químicas, farmacêuticas, petroquímicas, de refino de alumina etc., é aplicável também em reservatórios expostos ao ar livre, tais como diques, lagos e lagoas, barragens e outros. Medir nível na maioria dos casos tem grande impacto na seguran
Publicado em: 2005
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12. DifusÃo e transporte na presenÃa de macromolÃculas. Imagens e espectroscopia por RMN
The electronic Overhauser effect was employed to enhance nuclear magnetic resonance images obtained in a magnetic eld of only 16 mT. Despite the weak magnetic eld, the technique can reveal, in some systems, various aspects of ionic transport and kinetics apparently not observed in conventional high-eld magnetic resonance imaging. We employed Overhauser imagi
Publicado em: 2004