Three-dimensional Evaluation of the Posterior Airway Space: Differences in Computed Tomography and Cone Beam Computed Tomography

Overview

Journal Clin Oral Investig

Specialty Dentistry

Date 2018 May 5

PMID 29725852

Citations 7

Authors

Nassim Ayoub

Philipp Eble

Kristian Kniha

Florian Peters

Stephan Christian Mohlhenrich

Evgeny Goloborodko

Frank Holzle

Ali Modabber

Affiliations

Soon will be listed here.

Abstract

Objectives: Obstructive sleep apnea syndrome (OSAS) becomes increasingly important. For diagnosis and surgery, computed tomography (CT), and cone beam computed tomography (CB-CT) are used equally, although in most of cases, patient positioning differs between supine positioning (CT) and upright seating positioning (CB-CT). We measured volumetric and anatomical changes in the posterior airway space (PAS) between upright and supine positioning in a three-dimensional set up.

Materials And Methods: Coherent CT and CB-CT scans of 55 patients were included in the study. Using Brainlab ENT 3.0, image data was superimposed, and three-dimensional models were segmented. PAS height, cross-sectional area, vertical and horizontal position of the mandible and hyoid, and volumetric analyses of the three-dimensional models were measured.

Results: PAS height and cross-sectional area were significantly higher in CB-CT compared to CT scans (p < 0.001). In the vertical dimension, the mandible and hyoid were localized more caudally in CB-CT in contrast to CT scans (p < 0.04; p < 0.001). Three-dimensional evaluation showed a greater volume of the PAS in CB-CT (p < 0.0001). Pearson correlation coefficient showed a correlation between vertical positioning of the mandible and hyoid compared to the positioning of the patient.

Conclusions: Patient positioning during CT and CB-CT has an effect on the location of anatomical structures like the mandible and hyoid and changes the dimensions and volume of the posterior airway space significantly.

Clinical Relevance: The radiological technique used and the positioning of the patient should be taken into account when considering further surgical therapy.

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