Study On The Measurement Of Laryngotracheal Stenosis By Three Dimensional Reconstruction Based On CT

Objective: To demonstrate a CT image post-processing techniques, and three-dimensional assessment of our department more than 10 years of laryngotracheal stenosis, stenosis degree and length related position.Method: retrospective collected 35 patients in our department treatment of laryngotracheal stenosis and 20 cases of normal laryngeal CT data from March 2004 to March 2016. Using MIMICS software to three-dimensionally reconstruct laryngotracheal model and extract the centerline.Afterward obtaining cross-sectional area measured perpendicularly to the centerline,which are plotted as a line graph. Each patient made individual airway cross-sectional area curve to contraste between the standard airway cross-sectional area curve. Select normal thyroid cartilage notch, glottis, thyroid cartilage, the cricoid cartilage and sternal notch plane area and thyroid cartilage edge to the suprasternal notch length to compare the Mimics software centerline measurement method and our hospital CT workstation adventage workstation with three-dimensional reconstruction measurement differences 2, measuring the centerline airway stenosis length and area were compare with CT results. The lower edge of the thyroid cartilage, the center of curvature of the curve on the sternal notch distance, narrow segment, curve and the horizontal plane, the angle between the vertical plane and other 15 relevant factor were in multivariate analysis of afore-mentioned difference. 3,Comparing wearing tracheal tube in patients with non-wearing patients trachea tracheal tube’s forward angle and skew angle whether these difference were significant or not. 3.Forward-looking measuring the result of laryngotracheal stenosis’ the actual measured specimen length with the center of the curve, comparing with CT results in surgery from March 2015 to March 2016.Results: Paired test analysis of normal thyroid cartilage notch, glottis,thyroid cartilage margin, cricoid cartilage, margin, suprasternal notch plane area and the thyroid cartilage edge to the suprasternal notch length of centerline measurement and adventage workstation results had significant difference (P <0.05).The paired t-test analysis of centerline measurement (simple airway stenosis’ the minimum area、length and the tracheotomies’ length between simple CT reconstruction’ results show: the difference was statistically significant (P<0.001、P=0.02、P=0.012); multi-factor linear regression model showed that: the centerline and CT measurement of the length difference relate the centerline ’stenosis length ,CT measurement length (P <0.001), CT slice thickness (P = 0.003).Centerline and CT measurement of minimum area difference related the centrerline and the CT minimum stenosis area (P = 0.004),trachea forward angle(P = 0.001). Comparison of specimens measuring,centerline is accurate and less than the difference between the length of the specimen 1MM.The tracheal anteversion angle’s differences in patients with wearing tracheal tube and no-wearing tracheal tube in patients was statistically significant (p = 0. 01)Conclusion: The three-dimensional reconstruction of the trachea centerline can accurately measure the extent of laryngeal and tracheal stenosis and lesions and helps precise resection. Male and female laryngeal tracheal airway area and morphology are different. Trachea tracheal tube wear can lean forward to reduce the angle between the horizontal plane.