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Article Dans Une Revue Ultrasonics Année : 2004

Noninvasive microbubble-based pressure measurements: a simulation study

Résumé

This paper describes a noninvasive method to measure local hydrostatic pressures in fluid filled cavities. The method is based on the disappearance time of a gas bubble, as the disappearance time is related to the hydrostatic pressure. When a bubble shrinks, its response to ultrasound changes. From this response, the disappearance time, and with it the hydrostatic pressure, can be determined. We investigated the applicability of the gases Ar, C3F8, Kr, N2, Ne, and SF6, based on their diffusive properties. For pressure measurements with a limited duration, e.g. 150 ms, Kr and Ar bubbles are most suitable, since they are most sensitive to pressure change. If there is also a limitation to bubble size, e.g. a maximum diameter of 6 $\mu$m, SF6 is most suitable. We present improvements of a method that correlates the duration of the decay of the fundamental ultrasound response to the hydrostatic overpressure. We propose to correlate the duration until subharmonic occurrence in combination with its decay, to hydrostatic overpressure, since the subharmonic decays more rapidly than the fundamental response. For a dissolving Ar gas bubble with an initial diameter of 14 $\mu$m, the overpressure can be determined 4 times as precise from the decay of the subharmonic response as from the decay of the fundamental response. Overpressures as small as 11 mmHg may be discriminated with this method.
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Dates et versions

hal-03193398 , version 1 (13-04-2021)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Michiel Postema, Ayache Bouakaz, Nico de Jong. Noninvasive microbubble-based pressure measurements: a simulation study. Ultrasonics, 2004, Proceedings of Ultrasonics International 2003 (UI03) 30 June-3 July 2003, Granada, 42 (1-9), pp.759-762. ⟨10.1016/j.ultras.2003.12.007⟩. ⟨hal-03193398⟩
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