Cavities of irregular geometry can be modeled as Helmholtz resonators, provided they adhere to specific dimensional limits. If the characteristics of the entrance region or "neck" of a cavity are held fixed, the cavity's resonant frequency will be a function only of its volume. Using an electronic feedback technique and hand-held adapter, the Helmholtz resonator model has been applied to determine the volume of both simple and complex cavities, including castings of human nasal passages. Clinical application of this technique using live subjects is planned.
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