Estudo de técnicas de filtragem discreta para redução de ruído speckle em imagens de ultrassonografia

Abstract

One of the medical tests currently most used is the ultrasound. Ultrasonography uses the echoes generated by ultrasonic waves to view the internal structures of the body. However, images generated by this diagnostic method usually have no significant quality due to the presence of speckle characteristic noise which can be, in turn, perceived as granularities. The presence of that noise makes it necessary to have, most of the time, professional with much experience in the respective field to identify structures, such as the sex of the baby or the state of a tissue. Thus, this paper proposes an image filter comparison in the space domain with application in speckle noise reduction in ultrasound images. The performances of the filters usually appointed by the scientific community as the best in reducing the respective noise are then compared with less complex filters and with combinations of these techniques as well. The computing environments MATLAB and ENVI are the softwares for which the filtered images were obtained. Finally, the results were evaluated by the subjective evaluation method MOS - Mean Opinion Score