Figure - PMC

Skip to main content

View full-text article in PMC

. Author manuscript; available in PMC: 2011 Dec 1.

Published in final edited form as: Acad Radiol. 2010 Oct 14;17(12):1525–1534. doi: 10.1016/j.acra.2010.08.005

Fig. 3 — Fig. 3a. Side view of an elliptical airway that is tilted with respect to the CT z-axis, which lies along the bore of the CT scanner.

Fig. 3b Top view of an elliptical airway that is tilted with respect to the CT z-axis. The solid inner and outer ellipses are the limits of the airway seen in the CT image (CT ellipses). The Center ellipse, half way between the inner and outer ellipses, is used in finding the airway walls. (a_i, b_i) are the major and minor axes of the inner edge of the airway. (a_o, b_o) are the major and minor axes of the outer edge of the airway. Since this airway is circular, the major and minor axes are equal.

Fig. 3 — Fig. 3a. Side view of an elliptical airway that is tilted with respect to the CT z-axis, which lies along the bore of the CT scanner.

Fig. 3b Top view of an elliptical airway that is tilted with respect to the CT z-axis. The solid inner and outer ellipses are the limits of the airway seen in the CT image (CT ellipses). The Center ellipse, half way between the inner and outer ellipses, is used in finding the airway walls. (a_i, b_i) are the major and minor axes of the inner edge of the airway. (a_o, b_o) are the major and minor axes of the outer edge of the airway. Since this airway is circular, the major and minor axes are equal.