Figure 18.

Data-space partitions corresponding to various scan configurations or common CT issues in which knowledge of data function within some portions of the data space is missing. The 2D rectangle represents the data space with the horizontal and vertical axes representing the detector-bin and view-angle coordinates, respectively. Row 1: partitions corresponding to a half-detector scan (left), a scan as illustrated in figure 19 (middle), and a few-view scan (right). Row 2: partitions corresponding to a scan over a limited angular range (left), an interior-problem scan (middle) and an exterior-problem scan (right). Row 3: a scan of the cross section with a metal object (left), a scan with bad detector bin (middle) and a scan with an angular-dependent coded aperture (right).