The pressure fields of two different high intensity focused ultrasound (HIFU) transducers operated in burst mode were measured at acoustical power levels of 25 and 50 W (continuous wave equiva- lent) with three different hydrophones: A fiber-optic displacement sensor, a commercial HIFU nee- dle hydrophone, and a prototype of a membrane hydrophone with a protective coating against cavitation effects. Additionally, the fields were modeled using a freely available simulations soft- ware package. The measured waveforms, the peak pressure profiles, as well as the spatial-peak tem- poral-average intensities from the different devices and from the modeling are compared and possible reasons for differences are discussed. The results clearly show that reliable pressure meas- urements in HIFU fields remain a difficult task concerning both the reliability of the measured val- ues and the robustness of the sensors used: Only the fiber-optic hydrophone survived all four exposure regimes and the measured spatial-peak temporal-average intensities varied by a factor of up to 1.5 between the measurements and the modeling and between the measurements among them- selves.

A comparative evaluation of three hydrophones and a numerical model in high intensity focused ultrasound fields / Haller, J; Durando, Giovanni; Shaw, A.. - In: THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA. - ISSN 0001-4966. - 131:2(2011), pp. 1121-1130. [10.1121/1.3675003]

A comparative evaluation of three hydrophones and a numerical model in high intensity focused ultrasound fields

DURANDO, GIOVANNI;
2011

Abstract

The pressure fields of two different high intensity focused ultrasound (HIFU) transducers operated in burst mode were measured at acoustical power levels of 25 and 50 W (continuous wave equiva- lent) with three different hydrophones: A fiber-optic displacement sensor, a commercial HIFU nee- dle hydrophone, and a prototype of a membrane hydrophone with a protective coating against cavitation effects. Additionally, the fields were modeled using a freely available simulations soft- ware package. The measured waveforms, the peak pressure profiles, as well as the spatial-peak tem- poral-average intensities from the different devices and from the modeling are compared and possible reasons for differences are discussed. The results clearly show that reliable pressure meas- urements in HIFU fields remain a difficult task concerning both the reliability of the measured val- ues and the robustness of the sensors used: Only the fiber-optic hydrophone survived all four exposure regimes and the measured spatial-peak temporal-average intensities varied by a factor of up to 1.5 between the measurements and the modeling and between the measurements among them- selves.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/32947
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