Q15. Why do I have to use a mouthpiece? Why can’t I use a mask?
A15. Sound waves travel best when they are directed in a straight line. When the sound waves get into the lungs, they have to make many turns to travel through the tracheobronchial tree. Each of those turns, especially into progressively smaller airways, may result in a dampening of the sound. We can’t do anything about what happens inside the lung. However, we want the sound waves to be at their maximum amplitude when they enter the airway. Consequently, the straight mouthpiece and Y-adapter is designed to assure that the sound waves are not dampened before they enter the airways through the mouth.
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