title: Artifacts in measuring airway areas by acoustic reflections.
authors: N
authors: N
authors: Molfino
authors: N
authors: N
authors: Zamel
authors: V
authors: V
authors: Hoffstein
authors: J
authors: J
authors: Fredberg
mesh_terms: D003550:Cystic Fibrosis / Q000000981:diagnostic imaging*; D006801:Humans; D014132:Trachea / Q000000981:diagnostic imaging*; D014463:Ultrasonography / Q000379:methods*