Figure 2
From: Terahertz time-domain imaging for the examination of gilded wooden artifacts

(a) 3D Time-of-flight. (b) 2D Time-of-Flight. (c) B-scan along the y-axis indicated as solid line in the 2D ToF. (d) B-scan along the x-axis indicated as dashed line in the 2D ToF. Arrows in B-scans correspond to painted areas where THz radiation penetrates into inner layers on the artwork.