Compilation of empirical ultrasonic properties of mammalian tissues. II

Goss, S. A.; Johnston, Roy L.; Dunn, F.

doi:10.1121/1.384509

Cited by 373 publications

(134 citation statements)

References 19 publications

Supporting

Mentioning

128

Contrasting

Unclassified

Order By: Relevance

“…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 Tissuecontrasting

confidence: 39%

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

et al. 2011

View full text Add to dashboard Cite

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.

show abstract

Section: The Effect Of Tissuecontrasting

confidence: 39%

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

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The material constants used for bone were ρ b = 1850 kg/m 3 , λ b = 9306 MPa, μ b = 3127 MPa, η = 40 Pa · s and ξ = 0.1 Pa · s. This produced longitudinal and shear (phase) velocities at 1.5 MHz of 2901 m/s and 1307 m/s and differential specific attenuations of 6.09 dB cm −1 MHz −1 and 49.7 dB cm −1 MHz −1 , respectively. The value of shear attenuation in bone has the most degree of uncertainty as reported in the literature; for example Goss et al (1980) noted experimental values of 7.6 dB cm −1 MHz −1 while a more recent article by White et al (2006) reported (at 0.84 MHz) that shear attenuation was 17 dBMHz −1 , more than four times the value of longitudinal attenuation. Therefore, the higher value of shear attenuation used in this study is felt to be reasonable because of the higher center frequency (1.5 MHz) used.…”

Section: Ultrasound Simulations and Parametersmentioning

confidence: 99%

“…The material in the marrow spaces of the tissue was assumed to be fresh blood. (Goss et al 1968(Goss et al ,1980Selfridge 1985).…”

Section: Ultrasound Simulations and Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasound Simulation in the Distal Radius Using Clinical High-Resolution Peripheral-CT Images

Floch

McMahon

Luo

et al. 2008

Ultrasound in Medicine & Biology

View full text Add to dashboard Cite

The overall objective of this research is to develop an ultrasonic method for noninvasive assessment of the distal radius. The specific objective of this study was to examine the propagation of ultrasound through the distal radius and determine the relationships between bone mass and architecture and ultrasound parameters. Twenty-six high-resolution peripheral-CT clinical images were obtained from a set of subjects that were part of a larger study on secondary osteoporosis. A single midsection binary slice from each image was selected and used in the two-dimensional (2D) simulation of an ultrasound wave propagating from the anterior to the posterior surfaces of each radius. Mass and architectural parameters associated with each radius, including total (trabecular and cortical) bone mass, trabecular volume fraction, trabecular number and trabecular thickness were computed. Ultrasound parameters, including net time delay (NTD), broadband ultrasound attenuation (BUA) and ultrasound velocity (UV) were also evaluated. Significant correlations were found between NTD and total bone mass (R 2 = 0.92, p < 0.001), BUA and trabecular number (R 2 = 0.78, p < 0.01) and UV and trabecular bone volume fraction (R 2 = 0.82, p < 0.01). There was only weak, statistically insignificant correlation (R 2 < 0.14, p = 0.21) found between trabecular thickness and any of the ultrasound parameters. The study shows that ultrasound measurements are correlated with bone mass and architecture at the distal radius and, thus, ultrasound may prove useful as a method for noninvasive assessment of osteoporosis and fracture risk. KeywordsOsteoporosis; Ultrasound; Radius; Bone mass; Density; Net time delay; BUA; Peripheral-CT; Velocity Osteoporosis is a significant health problem affecting more than 20 million people in the United States and more than 200 million worldwide (Anonymous 2001). Osteoporosis is defined as the loss of bone mass with a concomitant disruption in microarchitecture, leading to an increased risk of fracture (Kanis 2002 The primary method for diagnosing osteoporosis and associated fracture risk relies on bone densitometry to measure bone mass (Kaufman and Siffert 2001). The use of bone mass is based on the well-established thesis that bone strength is strongly related to the amount of bone material present and that a stronger bone in a given individual is associated generally with a lower fracture risk (Johnell et al. 2005). Radiologic densitometry, which measures the (areal) bone mineral density (BMD) at a given site (e.g., hip, spine, forearm) is currently the accepted "gold standard" indicator of bone strength and fracture risk (Johnell et al. 2005;Blake and Fogelman 2003). Clinically, this is often done using dual energy X-ray absorptiometry (DXA), which measures the BMD in units of g/cm 2 (Blake and Fogelman 2003). Recently, high resolution peripheral-CT imaging has become available for clinical research studies and has led to renewed interest in the distal radius for a better understanding of the relationship betw...

show abstract

“…The software was developed with the use of LabVIEW 7.1 (National Instruments ), implementing these layers (according to tissue properties, as in Table 1 19,20 ), and simulating the passage of a flat wave according to the equations previously described. The software allows the user to define the following parameters of each layer: thickness (x), attenuation coefficient ( ), acoustic impedance (Z), density ( ), specific heat (c), and thermal conductivity (k).…”

Section: The Simulation Softwarementioning

confidence: 99%

Software didático para modelagem do padrão de aquecimento dos tecidos irradiados por ultra-som fisioterapêutico

Maggi¹,

Tp²,

Krüger³

et al. 2008

Rev. bras. fisioter.

View full text Add to dashboard Cite

Compilation of empirical ultrasonic properties of mammalian tissues. II

Abstract: The compilation of the literature on ultrasonic propagation properties of mammalian tissues [J. Acoust. Soc. Am. 64, 423 (1978)] is continued with the addition of 45 papers yielding over 700 lines of parametric data.

Cited by 373 publications

References 19 publications

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

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

Ultrasound Simulation in the Distal Radius Using Clinical High-Resolution Peripheral-CT Images

Software didático para modelagem do padrão de aquecimento dos tecidos irradiados por ultra-som fisioterapêutico

Contact Info

Product

Resources

About