Método Baseado em Morfologia Matemática e BM3D para Redução de Ruı́do em Imagens Dentais de TC de Baixa Radiação

The impact in reducing the radiation dose in computed tomography (CT) exams is directly related to the quality of the images obtained in this exam. Such images are degraded by undesirable artifacts, known as noise. In order to improve the quality of these images and provide an accurate medical diagnosis, it is necessary to apply noise reduction techniques. In this article, it is proposed a method to filter noise in low-dose dental CT images, based on mathematical morphology and block-matching 3D (BM3D) filtering. Experimental results of the proposed method were compared with several existing methods and valida- ted using the PSNR, SSIM and MSE metrics. Through several experiments, the proposed method demonstrated superior performance compared to the analyzed filters, reducing noise and preserving details in a more satisfactory way.