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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Acad Radiol. 2010 Jul 1;17(9):1186–1189. doi: 10.1016/j.acra.2010.04.016

Figure 1.

Figure 1

Comparison of cross-sectional area measurements and percentage collapse at year 1 (Yr1) and year 2 (Yr2) for end-inspiration (I) and dynamic expiration (E) in a 50 year-old man. Percentage expiratory collapse was 12% at Yr1 compared to 10% at Yr2.