In 1983, we reported the interest of cephalometic analysis in the study of obstructive sleep apneic patients. We mentioned then that when technically adequate, cephalometric roentgenograms yield data on the posterior airway space (PAS) clearly related to that obtained in the performance of computerized tomography (CT) scans. The relatively recent introduction of CT scans with three-dimensional analysis has added a new dimension to airway investigations.
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Riley et al. (1986) studied this question.