Aim. To study the life-time linear parameters of the sphenoidal sinus cavities in different reformats of cone-ray computed tomography (CRCT). Materials and methods. Measurements of cranial structures were fulfilled using tomograms of planed examinations, carried out at “Railway Dental Polyclinic” of Samara station “RR” in 2010-2014. They were obtained with cone-ray computed tomograph Galileos, (Sirona Company) with the software Galaxis. Eighty two persons with a mean age of 38,05 ± 0,77 years were examined. Results. The life-time linear parameters of the sphenoidal sinuses in different CRCT reformats were studied through the standard and additional craniometric points. Correlation links between the anatomic indices, characterizing the contour and the internal relief of sphenoidal sinuses were detected. Conclusions. The data on size characteristics and associated variability of the paranasal sinuses, obtained by means of standard CRCT, supplement and concretize the information database of medical craniology that is significant not only for orthodontics, but for otorhinolaryngology, ophthalmology, neurosurgery, as well.