Figure 1c. Dental CT scans in 24-year-old woman with periapical radiolucency in the left canine tooth from endodontal disease. (a) Transverse image shows where the cursor is deposited (curved arrows) for the program to produce a curved line (straight arrow) that defines the location for reformatting the panoramic image in c. Perpendicular numbered lines (arrowheads) define where cross-sectional images in d are reformatted. (b) Transverse image shows the appearance of the target due to the opaque root in the center of the radiolucency (arrowheads). (c) Panoramic image shows an area of sclerotic condensing osteitis (arrowheads) surrounding a periapical radiolucency (arrow). The dentine (D), dense enamel (E), pulp chamber (Pc), and root canal (Rc) are nicely depicted. (d) Cross-sectional views show the relation of the periapical radiolucency (arrowheads) to the buccal (solid arrow) and lingual (open arrow) cortex. (Reprinted, with permission, from reference 1.)