Método de redução de efeitos de artefatos metálicos em imagens de tomografia de baixa radiação

Abstract

Computed Tomography (CT) despite of experiencing a huge leap since its creation until nowadays still presents some failures that make it impossible, many times, a precise diagnosis. One of them, is the emergence of effects caused by metalic artefacts. When interacting with the metal, the x-rays are attenuated, resulting in a discrepancy between the image and the anatomic reality. It is known that high doses of x-rays can avoid this effects, but on the other hand, is considered one of the principal contributors to the risk of cancer. Therefore, this paper aims to develop a method to decrease the effects of metalic artifacts in low-doses CT images in order to help the specialists to obtain a more precise diagnosis. Using low-doses TC images and tecniques of image processing, this paper has obtained an average of 90% of approval in a avaliation with five images and four specialists in radiology, decreasing or removing, in some cases, totaly, the effects caused by the artefacts.