Description
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The 3D and 2D CT images of nest-gallery development of Spruce A timber: (a) initial scan;
(b) half-year later; (c) one year later; and (d) one and a half years later. Two-dimensional radial-section
images show dynamic change of the nest-gallery system, indicated by the sealing and re-opening of a
tunnel gallery (green rectangles). In 3D images, the presence of termites is indicated by the uncolored
area inside the nest-gallery. In the 2D CT images, the gray value of a pixel corresponds to an index of
density: the lighter the color, the denser the area [11]. Springwood and summerwood are indicated by
the darker and lighter colors in the images, respectively. EH, entrance hole; S, sapwood; H, heartwood;
P, fecal pellets. |