Temperature rise induced by an annular focused transducer with a wide aperture angle in multi-layer tissue

doi:10.1088/1674-1056/27/1/014301

Abstract In order to improve the operability and accuracy of high-intensity focused ultrasound (HIFU), an annular focused transducer, whereby a B-ultrasound probe is placed in its center, is used to realize the real time monitoring and control of the treatment. In this paper, the spheroidal beam equation (SBE) was used to calculate the sound field by an annular focused transducer with a wide aperture angle to first derive the heat deposition and the Pennes equation was used to calculate the temperature field in multi-layer tissue. We studied the effect of different parameters on the temperature of the tissues. The result shows that the focal length has a significant influence on both maximum liver temperature rise and skin temperature rise, and both increase with the increase in the focal length. When the frequency increases, the temperature rise first undergoes a rapid increase before gradually reaching a maximum, and then finally decreasing. The temperature rise increases while the inner radius decreases or the sound pressure increases. By choosing suitable parameters, the proper temperature rise both on the target tissue and skin via an annular focused transducer with a wide aperture angle can be obtained.

Keywords: spheroidal beam equation annular focused transducer multi-layer tissue temperature field

Received: 22 July 2017
Revised: 04 September 2017
Accepted manuscript online:

PACS:	43.25.+y	(Nonlinear acoustics)
	43.80.+p	(Bioacoustics)

Fund: Project supported by the National Key Research and Development Program, China (Grant No. 2016YFF0203000), the National Natural Science Foundation of China (Grant Nos. 11774167 and 61571222), the Fundamental Research Funds for the Central Universities, China (Grant No. 020414380001), the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLA201609), and AQSIQ Technology Research and Development Program, China (Grant No. 2017QK125).

Corresponding Authors: Xiaozhou Liu
E-mail: xzliu@nju.edu.cn

Cite this article:

Meng Qi(戚萌), Jiehui Liu(刘杰惠), Yiwei Mao(毛一葳), Xiaozhou Liu(刘晓宙) Temperature rise induced by an annular focused transducer with a wide aperture angle in multi-layer tissue 2018 Chin. Phys. B 27 014301

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Temperature rise induced by an annular focused transducer with a wide aperture angle in multi-layer tissue

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