Fig. 2.

Comparison of reconstructions obtained from applying ATD and DTD to the same set of 12 late time gates. Red and green corresponds to the yield distributions for 0.87 and 1.27 ns, respectively. The true locations of the inclusions are shown in gray. In the first two rows, the X–Z plots are generated by assigning the recovered yields to the red (0.87 ns) and green (1.27 ns) components of the RGB colormap. Each distribution is thresholded at 50% of its maximum. The bottom row shows line plots for ATD (dashed line) and DTD (solid line) along the x axis at the depth of the inclusion. The computation time for ATD was 21 times shorter than that for DTD.