Pulmonary airway area by the two-microphone acoustic reflection method

Area of Science:

• Respiratory Physiology
• Medical Acoustics
• Biomedical Engineering

Background:

• Noninvasive assessment of airway dimensions is crucial for diagnosing respiratory conditions.
• Previous acoustic reflection methods for nasal airways have been established.
• Current techniques for subglottic airway geometry often rely on helium-oxygen gas mixtures.

Purpose of the Study:

• To apply a two-transducer acoustic reflection system to measure upper airway and tracheal dimensions.
• To investigate the theoretical effects of breathing on acoustic reflection measurements.
• To propose a new procedure for subglottic airway geometry inference that does not require helium-oxygen.

Main Methods:

• Utilized a two-transducer acoustic reflection system.
• Measured acoustic reflection data at the mouth.
• Analyzed theoretical implications of breathing on measurements.
• Developed a novel procedure for airway geometry inference.

Main Results:

• Successfully applied the two-transducer system to the upper airway and trachea.
• Identified theoretical considerations regarding breathing effects.
• Proposed a new method for subglottic airway geometry assessment.

Conclusions:

• The two-transducer acoustic reflection method is applicable to upper airway and tracheal measurements.
• The proposed new procedure offers a noninvasive alternative for subglottic airway geometry inference.
• This advancement may simplify and improve the noninvasive assessment of airway dimensions.