A B-scan image is a two-dimensional view of a cross-
sectional plane of the part under inspection. In the B-scan,
the received signal amplitude obtained at successive in-
spected points performing a line is composed of the echoes
coming from cracks or discontinuities at different depths of
the part. B-scan images show a vertical cut of the part un-
der test where color changes in the images are related
either to porosity or to discontinuities due to cracks.