Figure 8.

Comparison of B-scan and wavenumber imaging in three cases in rail B. Case one: (a) is pulse-echo responses, (d,g) are the images of the full matrix, $h_{i,j}(t)$ and $f_{i,j}(t)$; Case two: (b) is pulse-echo responses, (e,h) are the images of the full matrix, $h_{i,j}(t)$ and $f_{i,j}(t)$; Case three: (c) is pulse-echo responses, (f,i) are the images of the full matrix, $h_{i,j}(t)$ and $f_{i,j}(t)$.