Development of noise decrease method using wavelet transform and sobel filter in 3D dental CT images

More patient dose is exposed in cone beam CT compared with former systems. If we reduce patient dose, the reconstruction images are significantly degranded by the quantum noise. It is necessary to improve these degranded images to satisfy the requirements of high image quality in modern medical diagnosis. In this paper, we propose the denoising method using the wavelet transform and sobel filter for 2D CT projection images. The results show that the proposed method can be reduced the patient dose to 10% original dose and removed the noise preserving edge.