Comparing digital and conventional cephalometric radiographs

With the introduction of digital cephalometry in orthodontics, many clinicians have cephalometric radiographs for a patient taken on 2 different cephalostats. Comparing these images is difficult because of differences in magnification between the 2 units. This article describes how to determine the magnification of a cephalometric radiograph and how to change the dimensions of a digital image to match a conventional image.