Fig. 5.
The first four rows show the projected x-ray transmission intensities through the reconstructed object for π/6 rotation intervals in [0, π]. Reconstructions of the object were obtained with data sets of 99, 198, 397, and 992 photons per frame, respectively. The total number of photons in each data set was 1.56 × 109. Details about the data sets are given in Table 1. The bottom row shows for comparison static radiographs of the object which were acquired at the same angles at high signal levels. Some fine, low-contrast features are circled. All images are scaled such that white and black colors represent no and complete attenuation respectively.