Jimenez, N.; Redondo, J.; Sánchez Morcillo, VJ.; Iglesias, PC.; Camarena Femenia, F. (2015). On the nonlinear effects in focused ultrasound beams with frequency power law attenuation. Physics Procedia. 63:47-53. https://doi.org/10.1016/j.phpro.2015.03.008
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/56787
Title:
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On the nonlinear effects in focused ultrasound beams with frequency power law attenuation
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Author:
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Jimenez, Noe
Redondo, Javier
Sánchez Morcillo, Víctor José
Iglesias, Pablo C.
Camarena Femenia, Francisco
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UPV Unit:
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Universitat Politècnica de València. Instituto de Investigación para la Gestión Integral de Zonas Costeras - Institut d'Investigació per a la Gestió Integral de Zones Costaneres
Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada
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Issued date:
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Abstract:
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[EN] When finite amplitude ultrasound propagation is considered, changes in spatial features of focused ultrasound beams can be
observed. These nonlinear effects typically appear in thermoviscous fluids as focal displacements, ...[+]
[EN] When finite amplitude ultrasound propagation is considered, changes in spatial features of focused ultrasound beams can be
observed. These nonlinear effects typically appear in thermoviscous fluids as focal displacements, beam-width variations or gain
changes. However, in soft-tissue media, the frequency dependence of the attenuation doesn t obey a squared law. In this way,
these complex media response leads to weak dispersion that prevents the cumulative processes of energy transfer to higher
harmonics. In this work we explore the influence of different frequency power law attenuation responses and its influence on the
self-defocusing effects in focused ultrasound beams. Thus, we numerically explore the spatial field distributions produced by
low-Fresnel number devices and High Intensity Focused Ultrasound (HIFU) radiating trough different soft-tissue media.
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Subjects:
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Nonlinear acoustics
,
Relaxation
,
Attenuation
,
Dispersion
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Frequency power-law
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Soft-tissue
,
FDTD
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Copyrigths:
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Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
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Source:
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Physics Procedia. (issn:
1875-3892
)
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DOI:
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10.1016/j.phpro.2015.03.008
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Publisher:
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Elsevier
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Publisher version:
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http://dx.doi.org/10.1016/j.phpro.2015.03.008
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Conference name:
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43rd Annual Symposium of the Ultrasonic Industry Association
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Conference place:
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Madrid, Spain
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Conference date:
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April 23-25, 2014
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Project ID:
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info:eu-repo/grantAgreement/MICINN//FIS2011-29734-C02-01/ES/CONTROL DE LA DIFRACCION DE LA LUZ EN MEDIOS MODULADOS/
info:eu-repo/grantAgreement/UPV//FPI-2011
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Description:
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This article belongs to a special issue:
43rd Annual UIA Symposium 23—25 April 2014 CSIC Madrid, Spain
Edited By Margaret Lucas and Enrique Riera
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Thanks:
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The work was supported by Spanish Ministry of Science and Innovation through project FIS2011-29731-C02-01. N. Jiménez acknowledges financial support from the Universitat Politècnica de València (Spain) through the FPI2011 ...[+]
The work was supported by Spanish Ministry of Science and Innovation through project FIS2011-29731-C02-01. N. Jiménez acknowledges financial support from the Universitat Politècnica de València (Spain) through the FPI2011 PhD grant.
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Type:
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Artículo
Comunicación en congreso
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