Fig. 12

(Top row) Co-, cross-polarization and the determined reflectivity OCT B-scan showing enamel (E), the dentin–enamel junction (DEJ), dentin (D), and initial demineralization or white spot (W) of an extracted human molar tooth. (Bottom row) For polarization contrast imaging, the retardation, the fast axis orientation and the DOPU (3 × 3 kernel) are displayed. Scale bars represent 500 μm. (Adopted with permission from [105])