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