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2018 Volume 27 Issue 1
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Meng Qi, Jiehui Liu, Yiwei Mao, Xiaozhou Liu. 2018: Temperature rise induced by an annular focused transducer with a wide aperture angle in multi-layer tissue, Chinese Physics B, 27(1): 395-400. doi: 10.1088/1674-1056/27/1/014301
Citation: Meng Qi, Jiehui Liu, Yiwei Mao, Xiaozhou Liu. 2018: Temperature rise induced by an annular focused transducer with a wide aperture angle in multi-layer tissue, Chinese Physics B, 27(1): 395-400. doi: 10.1088/1674-1056/27/1/014301
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Temperature rise induced by an annular focused transducer with a wide aperture angle in multi-layer tissue

  • Key Laboratory of Modern Acoustics, Institute of Acoustics and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

  • Available Online: 01/01/2018
  • Fund Project: the National Key Research and Development Program, China(Grant 2016YFF0203000)%the National Natural Science Foundation of China(Grant . 11774167 and 61571222)%the Fundamental Research Funds for the Central Universities, China(Grant 020414380001)%the State Key Laboratory of Acoustics, Chinese Academy of Sciences(Grant SKLA201609)%AQSIQ Technology Research and Development Program, China(Grant 2017QK125)
  • 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.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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

  • Available Online: 01/01/2018

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.

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