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Finite element analysis for acoustic and temperature characteristics of a piezoelectric HIFU transducer at 10 MH

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2023, 33(3), pp.116-123
  • DOI : 10.6111/JKCGCT.2023.33.3.116
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : May 3, 2023
  • Accepted : May 22, 2023
  • Published : June 30, 2023

Jong-Ho Kim 1,  Il-Gok Hong 2,  Ho-Yong Shin 3,  Hyo-Jun Ahn 4,  Jong In Im ORD ID 1

1한국세라믹기술원
2한국세라믹기술원 디지털소재혁신센터
3한국세라믹기술원 기업지원본부 시뮬레이션
4경상대학교

Accredited

ABSTRACT

A high intensity focuses ultrasound (HIFU) is one of the emerging technologies in the biomedical field. The piezoelectric HIFU transducer is a device that utilizes the thermal energy generated by high ultrasound energy. Recently an operating frequency of the HIFU transducer is to expand above a 7 MHz. In this study, the acoustic pressures and temperature distributions in the tissue that generated by the HIFU transducer at 10 MHz were calculated with the finite element method. In addition, the pressure focusing characteristics of the device were analyzed. The geometrical variables are the piezo-material thickness, lens shape, water height, and film thickness. The results shown that the acoustic pressure increased and saturated gradually when the height/radius (HL/RL) ratio of the lens increased. Moreover, the focal area was gradually decreases with HL/RL ratio of the lens. In case of the optimized HIFU transducer, the maximum pressure and temperature were analyzed about 19 MPa and 65°C respectively. And the -3 dB focused distances in the axial and lateral direction are around 2.3 mm and 0.23 mm respectively.

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