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Research Article

Important Queries for the Airway Analysis in CBCT Scans: Threshold Tool and Voxel Size Protocol

Luize Severo Martins, Gabriela Salatino Liedke, Heraldo Luis Dias da Siveira, Priscila Fernanda da Silveira, Nadia Assein Arus, Edwin M. Ongkosuwito, Mariana Boessio Vizzotto

Correspondence Address :

Luize Severo Martins
Mariana Boessio Vizzotto
School of Dentistry - Federal University of Rio Grande do Sul
Oral Radiology Section
Ramiro Barcelos Street, 2492 - 5th floor, Porto Alegre, CEP 90035-003
RS - Brazil
Email: luize.severomartins@gmail.com/ mari_vizzotto@yahoo.com.br

Received on: August 14, 2017, Accepted on: August 30, 2017, Published on: September 04, 2017

Citation: Luize Severo Martins, Gabriela Salatino Liedke, Heraldo Luis Dias da Siveira, et al. (2017). Important Queries for the Airway Analysis in CBCT Scans: Threshold Tool and Voxel Size Protocol

Copyright: 2017 Luize Severo Martins, Mariana Boessio Vizzotto, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

  • Abstract

Abstract
Introduction: The purpose of this study was to analyze the threshold tool presented in post-processing software for airway volume estimation and the influence of voxel size in these measurements. 316-selected CBCT scans (0.2, 0, 25 and 0.4 voxel sizes) were retrospectively analyzed. A trained and calibrated examiner performed the volume measurements in specific sites in upper airway at 25 and chosen threshold tool using the Dolphin Software. ANOVA was used to compare the thresholds values for each voxel group and the differences of means between the preset and the chosen thresholds, while paired samples t-Test to compare differences between the chosen thresholds for voxel size groups.
Results & Discussions: The threshold values range from 26 to 43. The mean of the threshold tool value selected for voxel 0.4 was significantly lower than the mean thresholds of voxel 0.2mm to 0.25mm. As expected, small volumes were obtained with the preset threshold tool for all voxel sizes groups when compared with the chosen threshold. The mean of differences in volumes between preset and chosen threshold decreased with the increase of voxel size. The voxel size protocol influenced the threshold value choice for volume measurements in upper airway analysis. Using Dolphin Software, the thresholds near to 30 seems better filling the airway space. Thus, more studies must be performed to define scan protocols and thresholds parameters for airway evaluation.

Keywords: Dentistry, 3 d imaging, Software tool, Cone beam ct, Upper airway