Pulmonary airway area by the two-microphone acoustic reflection method.
We noninvasively assessed airway dimensions from acoustic reflection data measured at the mouth. We recently described a two-transducer system for measurement of the nasal airway. Here we apply this approach to the measurement of the upper airway and trachea. We describe the theoretical implications of breathing on this kind of measurement and propose a new procedure that, unlike single- and dual-transducer systems used currently, does not require the use of He-O2 for inference of geometry of subglottic airways.
Louis
B
B
Biomechanics Institute, Boston 02215.
Glass
G M
GM
Fredberg
J J
JJ
D000465:Algorithms; D006371:Helium; D006801:Humans; D007830:Larynx / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D008168:Lung / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D008170:Lung Compliance / Q000502:physiology; D008954:Models, Biological; D010100:Oxygen; D010614:Pharynx / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D012123:Pulmonary Ventilation; D012137:Respiratory System / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D012815:Signal Processing, Computer-Assisted; D014132:Trachea / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D014159:Transducers; D014463:Ultrasonography
D006371:Helium; D010100:Oxygen