Attenuation of porcine tissues in vivo after high-intensity ultrasound treatment

Zderic, Vesna; Keshavarzi, Amid; Andrew, Marilee A.; Vaezy, Shahram; Martin, Roy W.

doi:10.1016/j.ultrasmedbio.2003.09.003

Cited by 64 publications

(43 citation statements)

References 33 publications

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“…Similar changes were noted for degenerated bovine articular cartilage (Nieminen et al, 2004). The reported attenuation value increases over a hundred percent in case of porcine liver HIFU treatment in vivo (Zderic et al, 2004) or two hundred percent for porcine kidney thermal coagulation (Worthington, Sherar, 2001). It has been also reported that the attenuation coefficient differs for cancerous and healthy tissue (Saijo, Sasaki, 1996).…”

Section: Introductionsupporting

confidence: 65%

Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue

Klimonda¹,

Litniewski²,

Karwat³

et al. 2015

Archives of Acoustics

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The soft tissue attenuation is an interesting parameter from medical point of view, because the value of attenuation coefficient is often related to the state of the tissue. Thus, the imaging of the attenuation coefficient distribution within the tissue could be a useful tool for ultrasonic medical diagnosis. The method of attenuation estimation based on tracking of the mean frequency changes in a backscattered signal is presented in this paper. The attenuation estimates are characterized by high variance due to stochastic character of the backscattered ultrasonic signal and some special methods must be added to data processing to improve the resulting images. The following paper presents the application of Spatial Compounding (SC), Frequency Compounding (FC) and the combination of both. The resulting parametric images are compared by means of root-mean-square errors. The results show that combined SC and FC techniques significantly improve the quality and accuracy of parametric images of attenuation distribution.

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Section: Introductionsupporting

confidence: 65%

Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue

Klimonda¹,

Litniewski²,

Karwat³

et al. 2015

Archives of Acoustics

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“…Hence, in translating the nonlinearity propagation seen in water to that seen in tissue for the same beam, for most tissue types it is the change in absorption which is the overwhelming consideration, not the change in B/A (Duck 2010). The absorption coefficients for soft tissue in the literature are for lower signal amplitudes than the ∼1 GPa levels found in this paper, and vary considerably (Burley et al 1980;Goss, Johnston & Dunn 1980;Damianou, Sanghvi & Fry 1997;Bailey et al 2003;Zderic et al 2004;Liu et al 2006;Coussios & Roy 2008). To reduce the range of values available even for the restricted amplitude range of clinical diagnostic device output, it is a standard practice to 'derate' the field values measured in water by 0.3 dB cm −1 MHz −1 , and for the data specific to the tissues and amplitudes occurring in this paper, this is also applied to the predicted values here to estimate the signals that would be detected were the fields to propagate through soft tissue.…”

Section: The Effect Of Tissuementioning

confidence: 57%

The collapse of single bubbles and approximation of the far-field acoustic emissions for cavitation induced by shock wave lithotripsy

et al. 2011

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Recent clinical trials have shown the efficacy of a passive acoustic device used during shock wave lithotripsy (SWL) treatment. The device uses the far-field acoustic emissions resulting from the interaction of the therapeutic shock waves with the tissue and kidney stone to diagnose the effectiveness of each shock in contributing to stone fragmentation. This paper details simulations that supported the development of that device by extending computational fluid dynamics (CFD) simulations of the flow and near-field pressures associated with shock-induced bubble collapse to allow estimation of those far-field acoustic emissions. This is a required stage in the development of the device, because current computational resources are not sufficient to simulate the far-field emissions to ranges of O(10 cm) using CFD. Similarly, they are insufficient to cover the duration of the entire cavitation event, and here simulate only the first part of the interaction of the bubble with the lithotripter shock wave in order to demonstrate the methods by which the far-field acoustic emissions resulting from the interaction can be estimated. A free-Lagrange method (FLM) is used to simulate the collapse of initially stable air bubbles in water as a result of their interaction with a planar lithotripter shock. To estimate the far-field acoustic emissions from the interaction, this paper developed two numerical codes using the Kirchhoff and Ffowcs William-Hawkings (FW-H) formulations. When coupled to the FLM code, they can be used to estimate the far-field acoustic emissions of cavitation events. The limitation of the technique is that it assumes that no significant nonlinear acoustic propagation occurs outside the control surface. Methods are outlined for ameliorating this problem if, as here, computational resources cannot compute the flow field to sufficient distance, although for the clinical situation discussed, this limitation is tempered by the effect of tissue absorption, which here is incorporated through the standard derating procedure. This approach allowed identification of the sources of, and explanation of trends seen in, the characteristics of the far-field emissions observed in clinic, to an extent that was sufficient for the development of this clinical device.

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“…6,[14][15][16][17] The bovine fat results from Ref. 6 show a strong sensitivity to temperature, illustrating one of the difficulties in projecting in vitro results to in vivo situations.…”

Section: Attenuationmentioning

confidence: 99%

In vivo ultrasonic attenuation in cetacean soft tissues

Gray

Rogers

2017

The Journal of the Acoustical Society of America

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In vivo ultrasonic attenuation was estimated for extracranial soft tissues of two Tursiops truncatus and one Delphinapterus leucas. Backscatter data was non-invasively collected as part of routine health-based ultrasound examinations using a transducer operating in the 1.6–3.7 MHz frequency range. Data collected over the proximal mandible and temporal regions was processed to yield attenuation estimates using a reference tissue phantom whose properties had been independently determined. The estimated attenuations were at the low end of the range of literature-reported values for mammalian fatty and connective tissues. A companion model-based analysis quantified errors arising from tissue composition and sound speed uncertainties.

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Attenuation of porcine tissues in vivo after high-intensity ultrasound treatment

Cited by 64 publications

References 33 publications

Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue

Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue

The collapse of single bubbles and approximation of the far-field acoustic emissions for cavitation induced by shock wave lithotripsy

In vivo ultrasonic attenuation in cetacean soft tissues

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