Theoretical Calculation of Resonant Frequencies of the Human Alveolar Wall and Its Implications in Ultrasound Induced Lung Hemorrhage

The human alveolar wall was modeled here asmembranes and its resonant frequency was determined in orderto analyze the mechanism of alveolar resonance of theultrasound induced lung hemorrhage. The resonant frequencyof the membrane models of the human alveolar wall wasdetermined to be within the range of the frequency of diagnosticultrasound used in the thoracic and abdominal regions; whichis > 2.5 MHz. Thus, the alveolar resonance is proved to occurduring the diagnostic ultrasound imaging of humans. Howeverthe possibility of alveolar wall damage at resonance was notanalyzed here. Nevertheless according to the resonant frequencyequations derived here, the resonance of the alveolar wall bydiagnostic ultrasound waves can be eliminated from occurringwhen total lung capacity is ~ 20% (at maximal expiration)