Avaliação da variação escala de cinza em imagens ultrassônicas de tecidos biológicos ex-vivo em função da mudança temperatura

Abstract

Ultrasonography is one of the most used diagnostic imaging methods today due to its low cost and easy access. However, it does not present an image with a level of detail as observed with the magnetic resonance technique, e.g. In view of this, a new modality of ultrasound image processing that uses temperature variation as a means of disturbing the environment for obtaining a better-quality contrast, it was proposed by Teixeira et al., 2018. Where the theory of variation of backscattered energy - changes in backscattered energy (CBE) was used. In the same line of research, it was found that media with a greater number of lipid scatterers cause an increase in the CBE curve when heated, while media with aqueous scatterers cause a decline in the curve when subjected to the same conditions. In addition, it was noted that images taken at different temperatures showed different contrast, which led to believe that it would be possible to observe changes in the intensity of the ultrasonic signal with the heating of the medium. Thus, the present study aims to determine the smallest possible region in images of fresh pig fat and muscle tissues, whose variation in pixel intensity in shades of gray generates a noticeable contrast to the eyes of the observer. This variation is the result of the change in the ultrasonic signal generated in the biological tissue images during the temperature increase.