Seismic Methods

Schuck, Andreas; Lange, Gerhard

doi:10.1007/978-3-540-74671-3_11

Cited by 6 publications

(5 citation statements)

References 77 publications

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“…Although it can be a major drawback in seismology where propagation speeds may vary by a factor of 5 (typically from 1000 to 5000 m/s, [31]), this constraint is generally less critical in most situations for medical ultrasound where the speed of sound remains around 1500 m/s in soft tissues (typically from 1480 to 1670 m/s, [32]). The f-k migration was developed from the linear wave equation using Fourier transforms.…”

Section: Stolt's F-k Migrationmentioning

confidence: 99%

Stolt's f-k migration for plane wave ultrasound imaging

Garcia¹,

Tarnec²,

Muth³

et al. 2013

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

225

165

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Ultrafast ultrasound is an emerging modality that offers new perspectives and opportunities in medical imaging. Plane wave imaging (PWI) allows one to attain very high frame rates by transmission of planar ultrasound wavefronts. As a plane wave reaches a given scatterer, the latter becomes a secondary source emitting upward spherical waves and creating a diffraction hyperbola in the received RF (radio-frequency) signals. To produce an image of the scatterers, all the hyperbolas must be migrated back to their apexes. In order to perform beamforming of plane wave echo RFs and return high-quality images at high frame rates, we propose a new migration method carried out in the frequency-wavenumber (f-k) domain.The f-k migration for PWI has been adapted from the Stolt migration for seismic imaging. This migration technique is based on the exploding reflector model (ERM), which consists in assuming that all the scatterers explode in concert and become acoustic sources. The classical ERM model, however, is not appropriate for PWI. We showed that the ERM can be made suitable for PWI by a spatial transformation of the hyperbolic traces present in the RF data. In vitro experiments were performed to sketch the advantages of PWI with Stolt's f-k migration over the conventional delayand-sum (DAS) approach. The Stolt's f-k migration was also compared with the Fourier-based method developed by J-Y Lu.Our findings show that multi-angle compounded f-k migrated images are of quality similar to those obtained with a state-of-the-art dynamic focusing mode. This remained true even with a very small number of steering angles thus ensuring a highly competitive frame rate. In addition, the new FFT-based f-k migration provides comparable or better contrast-to-noise ratio and lateral resolution than the Lu's and DAS migration schemes. Matlab codes of the Stolt's f-k migration for PWI are provided.

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Section: Stolt's F-k Migrationmentioning

confidence: 99%

Stolt's f-k migration for plane wave ultrasound imaging

Garcia¹,

Tarnec²,

Muth³

et al. 2013

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

225

165

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“…The use of sedimentation velocity analytical ultracentrifugation (SV) has significantly expanded in the last decade (Howlett et al 2006;Scott and Schuck 2006;Cole et al 2008), and new computational methods for SV analysis are being actively developed by several groups (Balbo et al 2005;Philo 2006;Brown et al 2007Brown et al , 2009; Behlke and Ristau 2009;Brookes et al 2009;Correia and Stafford 2009). In particular, diffusion-deconvoluted sedimentation coefficient distributions calculated from direct boundary modeling of experimental data (Schuck 2000;Schuck et al 2002) have proven to be very useful tools in many biophysical applications (for a list of references see Schuck 2007). They can achieve relatively high hydrodynamic resolution of pauci-and polydisperse macromolecular mixtures, exhibit exquisite sensitivity for trace components (Berkowitz 2006;Liu et al 2006;Brown et al 2008a, b;Gabrielson et al 2009), and can be related to sedimentation coefficient isotherms and Gilbert-Jenkins theory for the analysis of slowly or rapidly interacting systems (Dam and Schuck 2005;.…”

Section: Introductionmentioning

confidence: 99%

On computational approaches for size-and-shape distributions from sedimentation velocity analytical ultracentrifugation

Schuck

2009

Eur Biophys J

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Sedimentation velocity analytical ultracentrifugation has become a very popular technique to study size distributions and interactions of macromolecules. Recently, a method termed two-dimensional spectrum analysis (2DSA) for the determination of size-and-shape distributions was described by Demeler and colleagues (Eur Biophys J 2009). It is based on novel ideas conceived for fitting the integral equations of the size-and-shape distribution to experimental data, illustrated with an example but provided without proof of the principle of the algorithm. In the present work, we examine the 2DSA algorithm by comparison with the mathematical reference frame and simple well-known numerical concepts for solving Fredholm integral equations, and test the key assumptions underlying the 2DSA method in an example application. While the 2DSA appears computationally excessively wasteful, key elements also appear to be in conflict with mathematical results. This raises doubts about the correctness of the results from 2DSA analysis.

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“…Seismic methods generate elastic waves that propagate in the physical environment (Schuck and Lange, 2007). Elastic waves are driven by strain energy pulses and have distinct speeds and propagation modes in solid and fluid media (Carcione et al, 2018).…”

Section: Bedrock Fracture Strikes and The Results Of Seismic Refracti...mentioning

confidence: 99%

“…Other factors such as the degree of alteration and fracturing of the rock also influence the propagation of seismic waves (Berryman, 2007;Lei, 2022). The result from seismic data is an image of the subsurface, which can include geological layers and stratigraphic variations, top of bedrock, and the water level, for example, (Schuck and Lange, 2007;Stark, 2008).…”

Section: Bedrock Fracture Strikes and The Results Of Seismic Refracti...mentioning

confidence: 99%

Investigation of fractured rock beneath a uranium-tailing storage dam through UAV digital photogrammetry and seismic refraction tomography

Guireli Netto,

Singha,

Moreira

et al. 2023

Front. Earth Sci.

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Failure events in dams can be associated with processes in the dam body and in the foundation of the structure. If they are properly identified in early stages, corrective actions can take place, leading to a reduction in the risk of collapse and/or rupture of the dam. Most studies on dams are carried out on the body of the dam; however, problems associated with the foundation of the structure can also lead to loss of stability and subsequent ruptures. This study presents an analysis of the advantages and limitations of the use of seismic refraction in hydrogeological studies of fractured aquifers under pressure from large loads, specifically a dam in this case. Seismic refraction data were collected on an outcrop of fractured rock near a uranium storage dam foundation in southeastern Brazil. The results and interpretations were supported by a structural analysis performed through manual strike measurements collected with a Clark compass and an uncrewed aerial vehicle digital photogrammetry survey in an outcrop. The digital photogrammetric survey mapped the spatial distribution and orientation of the geological structures of the rock mass. Although the structural measurements performed through digital photogrammetry presented greater variability than the measurements collected from the compass, the maximum density of the fracture measurements obtained from both methods were similar and were corroborated by the regional and local fracture patterning. The integration of seismic refraction data with geotechnical and geological investigations allowed us to identify the positioning of structural lineaments in the rock mass and zones with a higher degree of rock alteration. The identification of highly fractured zones in the rock mass from such non-invasive investigations could be used to assist in decision making for structural reinforcements in the foundation of the dam to avoid the loss of stability at the foot of the dam from possible leaks or water flows from the reservoir.

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Seismic Methods

Cited by 6 publications

References 77 publications

Stolt's f-k migration for plane wave ultrasound imaging

Stolt's f-k migration for plane wave ultrasound imaging

On computational approaches for size-and-shape distributions from sedimentation velocity analytical ultracentrifugation

Investigation of fractured rock beneath a uranium-tailing storage dam through UAV digital photogrammetry and seismic refraction tomography

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