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Instantaneous Phase Threshold for Reflector Detection in Ultrasonic Images
(Institute of Electrical and Electronics Engineers (IEEE), 2014-07-01)
A method for reflector detection, based on the instantaneous phase of the aperture data for ultrasonic images, is proposed. The instantaneous phase (IP) image is obtained by replacing the amplitude information by the ...
EDGE-PRESERVING SPECKLE TEXTURE REMOVAL BY INTERFERENCE-BASED SPECKLE FILTERING FOLLOWED BY ANISOTROPIC DIFFUSION
(ELSEVIER SCIENCE INCNEW YORK, 2012)
Ultrasonography has an inherent noise pattern, called speckle, which is known to hamper object recognition for both humans and computers. Speckle noise is produced by the mutual interference of a set of scattered wavefronts. ...
Mapeamento de ambientes utilizando sonares e problemas inversos
(Universidade Tecnológica Federal do ParanáCuritibaPrograma de Pós-Graduação em Engenharia Elétrica e Informática Industrial, 2015-07-10)
An autonomous mobile robot must be able to move through an environment without colliding with obstacles. This subject has been investigated by researchers over the years, mainly using sonar sensors to acquire distance data. ...
Sistema de varredura para aquisição e processamento de sinais ultrassônicos para caracterização de meios biológicos
(Universidade Tecnológica Federal do ParanáCuritibaBrasilPrograma de Pós-Graduação em Engenharia Elétrica e Informática IndustrialUTFPR, 2018-08-01)
The use of ultrasound for material characterization has been applied with satisfactory results since the 50's. Such success is justified by its non-invasive and non-ionizing characteristics, as well as its low implementation ...
Medição do perfil de velocidade por técnica ultrassônica utilizando o método da autocorrelação estendida e equipamento para ensaios não destrutivos
(Universidade Tecnológica Federal do ParanáCuritibaBrasilPrograma de Pós-Graduação em Engenharia Elétrica e Informática IndustrialUTFPR, 2016-11-04)
Interest in knowing the instantaneous velocity profile in fluid dynamics has grown in recent years as new flow visualization techniques are improving. In this context, the ultrasonic Doppler velocity profiler (UVP) has ...
Sparse Array Design Using the Genetic Algorithm for Optimizing the Radiation Pattern of Linear Arrays
(2019-01-01)
The genetic algorithm was used to obtain sparse arrays with 8, 16, 32 and 64 transducers in a possible aperture size of 128 elements. The optimization was made by minimizing a fitness function that takes into account the ...
Automatic object detection using shape information in ultrasound images
(2003)
A method is presented for segmentation of anatomical structures that incorporates prior information about shape. The method iteratively applies steps, which find object's border considering its properties independently ...
Implementação de beamformer adaptativo combinado com generalized sidelobe canceler e filtros para geração de imagens de ultrassom com ondas planas
(Universidade Tecnológica Federal do ParanáCuritibaBrasilPrograma de Pós-Graduação em Engenharia Elétrica e Informática IndustrialUTFPR, 2020-02-28)
Adaptive beamformer methods have been improving image processing by the Delay and Sum (DAS) method, with increasing resolution and contrast. Even so, the Minimum Variance (MV) method has much to be improved. Thus, new ...
Ultrassom terapêutico de alta potência no tratamento da lipodistrofia localizada abdominal: ensaio clínico randomizado duplo cego
(Universidade Tecnológica Federal do ParanáCuritibaBrasilDoutorado em Engenharia Elétrica e Informática IndustrialUTFPR, 2019-11-07)
Overweight, defined as the existence of more adipose tissue than the healthy ideal, has recently reached epidemic proportions globally, with more than one billion adults in this condition or obese. In order to reduce and ...
Application of the ultrasonic technique and high-speed filming for the study of the structure of air-water bubbly flows
(Elsevier Science IncNew YorkEUA, 2009)