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Ultrasonic CO2 measurements during quiet breathing with a portable spirometer may potentially diagnose airway obstructio

Ultrasound Transit Time Flow Measurement. Transit time differencesbetween upstream and downstream ultrasound pulses are used to measure gas flow velocityThe bigger the difference in transit times, the faster the velocity (cm/sec)Velocity (cm/sec) x cross-sectional area (cm2) gives flow (cm3/sec) or (ml/sec).

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Ultrasonic CO2 measurements during quiet breathing with a portable spirometer may potentially diagnose airway obstructio

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