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Nonuniform Bessel-Based Radiation Distributions on A Spherically Curved Boundary for Modeling the Acoustic Field of Focused Ultrasound Transducers

AuthorsGutierrez, Mario Ibrahin; Ramos, Antonio; Gutierrez, Josefina; Vera, Arturo; Leija, Lorenzo
KeywordsFocused transducer
Acoustic field
Nonuniform radiation distribution
Bessel radiation distribution
Spherically curved uniform radiator
Rim radiation
Lamb waves
Finite element modeling
Issue Date4-Mar-2019
PublisherMultidisciplinary Digital Publishing Institute
CitationApplied Sciences 9(5): 911 (2019)
AbstractTherapeutic focused ultrasound is a technique that can be used with different intensities depending on the application. For instance, low intensities are required in nonthermal therapies, such as drug delivering, gene therapy, etc.; high intensity ultrasound is used for either thermal therapy or instantaneous tissue destruction, for example, in oncologic therapy with hyperthermia and tumor ablation. When an adequate therapy planning is desired, the acoustic field models of curve radiators should be improved in terms of simplicity and congruence at the prefocal zone. Traditional ideal models using uniform vibration distributions usually do not produce adequate results for clamped unbacked curved radiators. In this paper, it is proposed the use of a Bessel-based nonuniform radiation distribution at the surface of a curved radiator to model the field produced by real focused transducers. This proposal is based on the observed complex vibration of curved transducers modified by Lamb waves, which have a non-negligible effect in the acoustic field. The use of Bessel-based functions to approximate the measured vibration instead of using plain measurements simplifies the rationale and expands the applicability of this modeling approach, for example, when the determination of the effects of ultrasound in tissues is required.
Publisher version (URL)http://dx.doi.org/10.3390/app9050911
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