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. Author manuscript; available in PMC: 2010 Apr 5.
Published in final edited form as: Inverse Probl. 2009 Jan 1;25(12):1230009. doi: 10.1088/0266-5611/25/12/123009

Figure 15.

Figure 15

Left: FBP reconstruction shown in a [−0.05, 0.05] gray scale window. Note the point indicated by the cross, when examining plot on the bottom. Right: same as the 512 × 512 TV-minimization image shown in figure 14 except gray scale window is changed to [−0.05, 0.05]. Bottom: plot of filtered sinogram values that contribute to the point indicated by the cross above. The strong, rapid variations occur for views where the cross lines up with a tangent of the skull. For a continuous sinogram, the ramp-filtered version diverges at such discontinuities. As a result, data discretization has a large impact near these singularities.