[Digital cephalometric teleradiography with storage phosphors. Comparative study]

Digital cephalometric radiography with light-emitting phosphors was performed on 15 patients during an orthodontic survey. Lateral views were performed; digital post-processing was carried out according to 3 different sets of characteristic variables (analogic-like, Xeroradiography-like and custom-made). Comparative cephalometric film radiographs were performed on another group of 15 patients matched for age and clinical problems. All the digital and conventional images were evaluated by 3 independent observers, who scored 0-2 the visibility of 16 cephalometric landmarks. Digital cephalometric radiography always provided good and clear images, which were easy to read by every observer, thanks to contrast optimization in the digital technique and to the possibility of interactive post-processing that could improve the lowest-quality images. The visibility study of 16 cephalometric landmarks resulted in a moderately higher score for film cephalography than for the digital technique (79.6/96 versus 78.1/96). Among digital post-processing variables, the customized curve gave the best results (mean score: 78.8/96). Digital cephalometric radiography allowed marked reduction in radiation dose (approximately 30-40% of conventional radiographs). This is a major factor when considering the widespread use of this technique and the young age of most patients.