Effect of the diameter of central opening on nonlinear acoustic field characteristics of high-intensity focused ultrasound transducers
- Authors: Nartov F.A.1, Karzova M.M.1, Khokhlova V.A.1
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Affiliations:
- Lomonosov Moscow State University, Faculty of Physics,
- Issue: Vol 71, No 3 (2025)
- Pages: 360-371
- Section: НЕЛИНЕЙНАЯ АКУСТИКА
- URL: https://bakhtiniada.ru/0320-7919/article/view/306582
- DOI: https://doi.org/10.31857/S0320791925030046
- EDN: https://elibrary.ru/jtuhdd
- ID: 306582
Cite item
Abstract
A number of novel non-invasive surgical technologies utilizing high-intensity focused ultrasound (HIFU) are based on the exploitation of nonlinear acoustic effects, leading to wave profile distortion and formation of shock fronts at the focus. Typically, these systems consist of multiple, nearly axially symmetric transducers creating a powerful ultrasound beam, with a central circular opening for accommodating a diagnostic probe for visualization purposes. For predicting focal field parameters for such transducer geometries, the equivalent source model of a spherical segment is convenient, as nonlinear effects in its field are well-studied. The equivalent source parameters (diameter, focal length, and amplitude) are optimized to closely approximate the axial focal region of the original transducer. This work investigates the influence of central opening size on nonlinear field characteristics and the applicability of the equivalent source model for a typical therapeutic ultrasound transducer with a frequency of 1 MHz and F# = 0.9. It is demonstrated that the central opening size significantly affects the manifestation of nonlinear effects in the focal region, and the equivalent source model can be applied only when the opening diameter is less than 20% of the transducer diameter.
Keywords
About the authors
F. A. Nartov
Lomonosov Moscow State University, Faculty of Physics,
Email: nartov.fyodor@gmail.com
Leninskie Gory 1, Moscow, 119991 Russia
M. M. Karzova
Lomonosov Moscow State University, Faculty of Physics,
Email: nartov.fyodor@gmail.com
Leninskie Gory 1, Moscow, 119991 Russia
V. A. Khokhlova
Lomonosov Moscow State University, Faculty of Physics,
Author for correspondence.
Email: nartov.fyodor@gmail.com
Leninskie Gory 1, Moscow, 119991 Russia
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