Fig. 8

Reconstructed results of the Shepp–Logan phantom by the FBP, the TV and the DDTV, respectively. The first to third rows refer to reconstructed images by the FBP (a–d), the TV (e–h) and the DDTV (i–l), respectively. The first to fourth columns refer to results from 180-view (a, e, i), 90-view (b, f, j), 60-view (c, g, k), 30-view (d, h, l) sampling, respectively