Airway area by acoustic reflection: the two-microphone method.
This report deals with noninvasive imaging of airway geometry based upon information contained in acoustic reflections measured at the mouth. Here we describe a new theoretical approach that enables development of a new miniaturized apparatus. Unlike the single-transducer systems used currently, this new strategy is based upon a two-transducer system that is a variant of that suggested originally by Shroeder (1967). We have developed, implemented, and tested computational algorithms necessary to reconstruct airway dimensions from acoustic reflection data using this two-transducer strategy.
Louis
B
B
Harvard School of Public Health, Department of Environmental Health, Boston, MA 02115.
Glass
G
G
Kresen
B
B
Fredberg
J
J
D000162:Acoustics / Q000295:instrumentation*; D000465:Algorithms; D015982:Bias; D002138:Calibration; D006801:Humans; D008904:Miniaturization; D009055:Mouth; D009666:Nose; D009716:Numerical Analysis, Computer-Assisted; D012137:Respiratory System / Q000033:anatomy & histology*; D012815:Signal Processing, Computer-Assisted; D014159:Transducers