Characterizing the Acoustic Output of an Ultrasonic Propulsion Device for Urinary Stones.
Characterizing the Acoustic Output of an Ultrasonic Propulsion Device for Urinary Stones.
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DOI：
10.1109/tuffc.2017.2758647
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发表时间：
2017-12
期刊：
影响因子：
--
通讯作者：
Bailey MR
中科院分区：
文献类型：
--
作者：
Cunitz BW;Dunmire B;Bailey MR
A non-invasive ultrasound system to facilitate the passage of small kidney stones has been developed. The device incorporates a software based ultrasound platform programmed with B-mode and Doppler for visualizing stones, plus long duration focused pulses for repositioning stones using the same transducer. This paper characterizes the acoustic outputs of the ultrasonic propulsion device. Though the application and outputs are unique, measurements were performed based on regulatory standards for both diagnostic ultrasound and extracorporeal lithotripters. The extended length of the pulse, time varying pressure output over the pulse, use of focused targeting, and the need to regulate the output at shallow depths, however, required modifications to the traditional acoustic measurement methods. Output parameters included: spatial peak intensities, mechanical index, thermal index, pulse energy, focal geometry, and target accuracy. The imaging and Doppler operating modes of the system meet the Food and Drug Administration (FDA) acoustic power and intensity limits for diagnostic ultrasound device. Push mode operates at a maximum mechanical index of 2.2, which is above the limit of 1.9 for diagnostic ultrasound, but well below any lithotripsy device and an ISPTA of 548 mW/cm2 which is below the 720 mW/cm2 limit for diagnostic ultrasound.
