Volume 8, Issue 2, March 2020, Page: 19-24
Reciprocity Calibration of Hydrophones in High Intensity Focused Ultrasound Field
Longyang Jia, Department of Ultrasound in Medicine, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China; Shanghai Institute of Ultrasound in Medicine, Shanghai, China
Wende Shou, Shanghai Institute of Ultrasound in Medicine, Shanghai, China
Bing Hu, Department of Ultrasound in Medicine, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China; Shanghai Institute of Ultrasound in Medicine, Shanghai, China
Received: Mar. 26, 2020;       Accepted: Apr. 22, 2020;       Published: May 11, 2020
DOI: 10.11648/j.ajpa.20200802.11      View  277      Downloads  120
Abstract
The primary problem of safety and efficiency for the high intensity therapeutic ultrasound (HITU) is the acoustic measure and dose control. The key technique is the pressure and intensity in the acoustic field especial in the focal region using the small calibrated hydrophone. The calibration accuracy of the used hydrophone is very important for HITU. Although the small hydrophone calibration has realized but there was no report of the hydrophone calibration in high pressure field. In this paper, our objective is to develop an absolute calibration method for the measurement of free field voltage sensitivity of hydrophone for high intensity focused ultrasound. First the acoustic pressure at the focal point by the self-reciprocity method of spherically curved auxiliary transducer is calibrated, then the free field voltage sensitivity of hydrophone at the geometric focal point of the calibrated pressure is obtained. The spatial average effect of acoustic pressure on hydrophone surface at the focal point is theoretically modified, and the expression and value table of correction coefficient of spatial average effect of hydrophone are given. The maximum acoustic pressure measured at the focal point was up to 5.58MPa (1.02kW/cm2) and used to calibrate a hydrophone from 0.95 MHz to 1.10 MHz with maximum local distortion parameter 0.72. The results show the rationality and feasibility of the measurement principle and method.
Keywords
High Intensity Focused Ultrasound (HIFU), Self-reciprocity Method, Hydrophone Calibration
To cite this article
Longyang Jia, Wende Shou, Bing Hu, Reciprocity Calibration of Hydrophones in High Intensity Focused Ultrasound Field, American Journal of Physics and Applications. Vol. 8, No. 2, 2020, pp. 19-24. doi: 10.11648/j.ajpa.20200802.11
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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