A PAUT probe, a 1-D array probe, has several transducer elements arranged side by side. This results in many A-scans parallel to each other. If you translate the A-scan values into color values, e.g., using a grayscale color palette, you get light colors for high A-scan values and dark colors for low values. This view is called a B-scan and is a “cross-section” through your material. So now you have a 2D image that shows the width and depth of your test data. This is much easier to interpret than conventional UT.