Fig. 6
From: Efficient implementation of a local tomography reconstruction algorithm
Line profiles of reconstructions of the Shepp–Logan phantom in a local tomography setup. Top line reconstruction profiles for padded FBP (blue) and iterative least squares (green). Left middle line of the reconstructed image. Right middle column of the reconstructed image. Bottom line difference profiles between the ground truth \(x^\sharp\) and the reconstructions with padded FBP \(x_0\) (blue) and iterative least squares \(\hat{x}\) (green). Left middle line of the difference image, right middle column of the difference image. The iterative least squares reconstruction almost removes the cupping effect, but a high-frequency noise can be seen in the profiles