Phase-inverted multifrequency HIFU transducer for lesion expansion: A simulation study

Da Sol Kwon, Jin Ho Sung, Chan Yuk Park, Jong Seob Jeong

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

It has been well known that the treatment time of high-intensity focused ultrasound (HIFU) surgery can be reduced by expanding the focal area per sonication. Previously, a dual-concentric transducer using phase-inverted signals was proposed to axially extend the focal area, but it has suffered from the deep notch point between two focal lobes. In this paper, we propose the improved HIFU transducer with dual-concentric aperture driven by phase-inverted multifrequency signals based on an inversion layer technique. The proposed transducer can generate the expanded focal zone with a significantly reduced level of the notch point between two focal lobes in the axial direction. The performance of the proposed transducer was investigated using finite element analysis simulation. The electrical impedance, one-way impulse response, and acoustic field of the transducer were simulated. Subsequently, the lesion volume was investigated by heat transfer simulation. In the proposed method, the level of the notch point was increased above -6 dB due to various phase interactions between the fundamental and harmonic frequency combinations and the inverted and noninverted frequency combinations. The -6-dB depth of field related to the necrotic lesion size was increased by 141% compared with the conventional single element transducer. Thus, the proposed transducer can be a potential way to enlarge coagulated lesion size resulting in a reduced overall treatment time of HIFU surgery.

Original languageEnglish
Pages (from-to)1125-1132
Number of pages8
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume65
Issue number7
DOIs
StatePublished - Jul 2018

Keywords

  • Dual-concentric aperture
  • finite element analysis (FEA)
  • heat transfer equation
  • high-intensity focused ultrasound (HIFU)
  • inversion layer technique
  • multifrequency
  • phase inverted

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