D Scan

D-scan refers to the image produced when the data collected from an ultrasonic inspection is plotted on an end view of the component. The true definition according to BS EN 1330-4:2000 is the 'Image of the results of an ultrasonic examination showing a cross-section of the test object perpendicular to the scanning surface and perpendicular to the projection of the beam axis on the scanning surface'.

The D-scan view is perpendicular to both the C-scan and the B-scan. However, like the C-scan, the D-scan usually shows ultrasonic data collected through the whole or part of the inspection volume.
The D-scan allows quick discrimination of indications along a weld by presenting their position in depth from the scanning surface. D-scans are often used in the presentation and analysis of TOFD data.