Adapted sinogram interpolation in computer tomographic images

In this paper, a limited-view computer tomography(CT) image reconstruction method was proposed to reduce the scan times and X-ray dose in the semiconductor industry. To reduce streak artifacts, which are caused by an insufficient number of views, we studied an adapted sinogram interpolation method based on the average pixel value. We used the characteristics of the neighboring views for an adapted linear interpolation. The change patterns were tracked by iteratively averaging the values. Next, we added a weight in accordance with the gradient. A Shepp-Logan phantom was used to evaluate the effectiveness of the proposed interpolation method. The results showed that the streak artifacts were reduced in the adapted interpolation method. In addition, we compared our method with the linear interpolation method by using the Peak-Signal-to-Noise Ratio(PSNR).