Figure 7
From: Post-processing sets of tilted CT volumes as a method for metal artifact reduction
Image quality and visible detail are clearly improved. Comparison of a single CT (left) to the average (middle) and median (right) of nine tilted CTs: streaking artifacts are strongly reduced, especially in the transverse and coronal view. Details in the vicinity of the metal implants are more truthfully represented, e.g. grey values of bone tissue within the bridges and crowns. In addition, aliasing has been reduced as well, which is especially visible in the occipital bone (arrows), a beneficial side effect of averaging over multiple exposures from different angles. The bounding box shows the region of interest for the calculation of bias, error and noise centered in the oral cavity.