Mild Case of Tracheal Stenosis
by Susanne Shamsolkottabi, Geoffrey McLennan, M.D. and Scott Graham, M.D.
One can see from a 3-dimensional reconstruction of the trachea that the superior part of the trachea is slightly more anterior than the posterior part of the trachea. Because of this the 2-dimensional images from the original scan show the trachea as an oval shape; whereas, the reconstructed oblique planes perpendicular to the centerline of the trachea show the trachea as a more circular shape. Measurements from the oblique planes are more accurate measurements of the trachea's dimensions because the oblique are perpendicular to the trachea. The Tube Geometry program automatically computes a three dimensional center line of the trachea using an iterative bisection algorithm. Then, double oblique planes perpendicular to the trachea's center line are displayed.
MPEG Movies
- The original trans axial section Electron Beam CT data set of a patient with mild tracheal stenosis distal to the vocal cords. The images are 3 mm thick.
- Movie of the trachea rotating
- Movie of TGA oblique reconstructions perpendicular to the centerline of the trachea.
- At its narrowest point this mildly stenotic trachea measures 33
mm2 in area. The anterior-posterior and lateral
dimensions at the stenosis are 6.0 mm and 6.3 mm respectively.
©1994-99 Division of Physiologic Imaging, Dept.
of Radiology, Univ. of Iowa
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