Enhancement of low-dose CT brain scans using graph-based anisotropic interpolation

Abstract

This paper considers the problem of enhancement of low-dose CT images. These images are usually distorted by the artifact similar to ‘film grain’, which affects image quality and hinders image segmentation. The method introduced in this paper reduces influence of the distortion by retrieval of pixel intensities under the ‘grains’ using graph-based anisotropic interpolation. Results of applying the introduced method to low-dose CT scans of hydrocephalic brains are presented and discussed. The influence of the introduced method on the accuracy of image segmentation is analysed.