Modelling And Vibration Analysis Of Alveolar Resonance Mechanism Of Ultrasound-Induced Lung Haemorrhage
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Date
2013-10
Authors
Devadason, John Jabaraj
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The most widely studied biological adverse effect of the diagnostic ultrasound is the
ultrasound-induced lung haemorrhage. The ultrasound-induced lung haemorrhage
has been observed in various experimental studies on animals. Nevertheless, the
actual mechanism by which the ultrasound-induced lung haemorrhage occurs still
remains undetermined and unproven. One of the proposed but unexplored
mechanisms is the alveolar resonance mechanism. The hypothetical alveolar
resonance mechanism is proposed as the forced vibration and resonance of the
alveolar structure by the external ultrasound waves. This modelling and vibration
analysis study, theoretically investigates the alveolar resonance mechanism and its
capability for producing the ultrasound-induced lung haemorrhage. Firstly, the facet
of the alveolar wall was modelled as square and circular membranes with fixedboundary.
Then, the application of the linear theory of vibration together with the
laws of linear elasticity, unto the membrane models, produced the equations of
fundamental frequency and threshold pressure. The fundamental frequency of each
membrane model represents the natural frequency of the alveolar structure at which
the alveolar resonance mechanism may occur.
Description
Keywords
Alveolar Resonance Mechanism , Ultrasound-Induced Lung Haemorrhage