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Artykuły w czasopismach na temat „One-Shot inversion method”

Autor: Grafiati

Data publikacji: 10 sierpnia 2024

Data aktualizacji: 31 lipca 2025

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1

Zigunov, Fernando, and John Charonko. "One-Shot Omnidirectional Pressure Integration Through Matrix Inversion." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–14. http://dx.doi.org/10.55037/lxlaser.21st.41.

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In this work, we present a method to perform 2D and 3D omnidirectional pressure integration from velocity measurements with a single-iteration matrix inversion approach. This work builds upon our previous work, where the rotating parallel ray approach was extended to the limit of infinite rays by taking continuous projection integrals of the ray paths and recasting the problem as an iterative matrix inversion problem. This iterative matrix equation is now ``fast-forwarded'' to the ``infinity'' iteration, leading to a different matrix equation that can be solved in a single iteration, thereby p

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Weglein, Arthur B. "A direct inverse method for subsurface properties: The conceptual and practical benefit and added value in comparison with all current indirect methods, for example, amplitude-variation-with-offset and full-waveform inversion." Interpretation 5, no. 3 (2017): SL89—SL107. http://dx.doi.org/10.1190/int-2016-0198.1.

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Direct inverse methods solve the problem of interest; in addition, they communicate whether the problem of interest is the problem that we (the seismic industry) need to be interested in. When a direct solution does not result in an improved drill success rate, we know that the problem we have chosen to solve is not the right problem — because the solution is direct and cannot be the issue. On the other hand, with an indirect method, if the result is not an improved drill success rate, then the issue can be either the chosen problem, or the particular choice within the plethora of indirect sol

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3

Yang, Rui, Honghong Yang, Li Zhao, et al. "One-Shot Reference-based Structure-Aware Image to Sketch Synthesis." Proceedings of the AAAI Conference on Artificial Intelligence 39, no. 9 (2025): 9238–46. https://doi.org/10.1609/aaai.v39i9.33000.

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Generating sketches that accurately reflect the content of reference images presents numerous challenges. Current methods either require paired training data or fail to accommodate a wider range and diversity of sketch styles. While pre-trained diffusion models have shown strong text-based control capabilities for reference-based content sketch generation, state-of-the-art methods still struggle with reference-based sketch generation for given content. The main difficulties lie in (1) balancing content preservation with style enhancement, and (2) representing content image textures at varying

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4

Liu, Bin, Senlin Yang, Yuxiao Ren, Xinji Xu, Peng Jiang, and Yangkang Chen. "Deep-learning seismic full-waveform inversion for realistic structural models." GEOPHYSICS 86, no. 1 (2021): R31—R44. http://dx.doi.org/10.1190/geo2019-0435.1.

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Velocity model inversion is one of the most important tasks in seismic exploration. Full-waveform inversion (FWI) can obtain the highest resolution in traditional velocity inversion methods, but it heavily depends on initial models and is computationally expensive. In recent years, a large number of deep-learning (DL)-based velocity model inversion methods have been proposed. One critical component in those DL-based methods is a large training set containing different velocity models. We have developed a method to construct a realistic structural model for the DL network. Our compressional-wav

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5

Jones, Glyn M., and D. B. Jovanovich. "A ray inversion method for refraction analysis." GEOPHYSICS 50, no. 11 (1985): 1701–20. http://dx.doi.org/10.1190/1.1441861.

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A new technique is presented for the inversion of head‐wave traveltimes to infer near‐surface structure. Traveltimes computed along intersecting pairs of refracted rays are used to reconstruct the shape of the first refracting horizon beneath the surface and variations in refractor velocity along this boundary. The information derived can be used as the basis for further processing, such as the calculation of near‐surface static delays. One advantage of the method is that the shape of the refractor is determined independently of the refractor velocity. With multifold coverage, rapid lateral ch

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6

Zhang, Yu, Guanquan Zhang, and Norman Bleistein. "Theory of true-amplitude one-way wave equations and true-amplitude common-shot migration." GEOPHYSICS 70, no. 4 (2005): E1—E10. http://dx.doi.org/10.1190/1.1988182.

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One-way wave operators are powerful tools for forward modeling and migration. Here, we describe a recently developed true-amplitude implementation of modified one-way operators and present some numerical examples. By “true-amplitude” one-way forward modeling we mean that the solutions are dynamically correct as well as kinematically correct. That is, ray theory applied to these equations yields the upward- and downward-traveling eikonal equations of the full wave equation, and the amplitude satisfies the transport equation of the full wave equation. The solutions of these equations are used in

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7

Zheng, Qiqi, Meng Li, and Bangyu Wu. "Physics-Guided Self-Supervised Learning Full Waveform Inversion with Pretraining on Simultaneous Source." Journal of Marine Science and Engineering 13, no. 6 (2025): 1193. https://doi.org/10.3390/jmse13061193.

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Full waveform inversion (FWI) is an established precise velocity estimation tool for seismic exploration. Machine learning-based FWI could plausibly circumvent the long-standing cycle-skipping problem of traditional model-driven methods. The physics-guided self-supervised FWI is appealing in that it avoids having to make tedious efforts in terms of label generation for supervised methods. One way is to employ an inversion network to convert the seismic shot gathers into a velocity model. The objective function is to minimize the difference between the recorded seismic data and the synthetic da

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8

Zhang, Yu, Sheng Xu, Norman Bleistein, and Guanquan Zhang. "True-amplitude, angle-domain, common-image gathers from one-way wave-equation migrations." GEOPHYSICS 72, no. 1 (2007): S49—S58. http://dx.doi.org/10.1190/1.2399371.

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True-amplitude wave-equation migration provides a quality migrated image of the earth’s interior. In addition, the amplitude of the output provides an estimate of the angular-dependent reflection coefficient, similar to the output of Kirchhoff inversion. Recently, true-amplitude wave-equation migration for common-shot data has been proposed to generate amplitude-reliable, shot-domain, common-image gathers in heterogeneous media. We present a method to directly produce angle-domain common-image gathers from both common-shot and shot-receiver wave-equation migration. Generating true-amplitude, s

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9

Dong, Wenjie, Mark Jeffrey Emanuel, Phillip Bording, and Norman Bleistein. "A computer implementation of 2.5-D common‐shot inversion." GEOPHYSICS 56, no. 9 (1991): 1384–94. http://dx.doi.org/10.1190/1.1443158.

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The computer implementation of a two‐and‐one‐half dimensional (2.5-D) constant density prestack inversion formalism with laterally and depth‐dependent background propagation speed is a Kirchhoff‐type inversion, summing data from a line of receivers over traveltime curves in the depth‐dependent background medium with weights determined from Born/Kirchhoff inversion theory. This theory predicts that the output will be a reflector map with peak amplitudes on each reflector being in known proportion to the angularly dependent geometrical optics reflection coefficient. The 2.5-D feature provides fo

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10

Vigh, Denes, and E. William Starr. "3D prestack plane-wave, full-waveform inversion." GEOPHYSICS 73, no. 5 (2008): VE135—VE144. http://dx.doi.org/10.1190/1.2952623.

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Prestack depth migration has been used for decades to derive velocity distributions in depth. Numerous tools and methodologies have been developed to reach this goal. Exploration in geologically more complex areas exceeds the abilities of existing methods. New data-acquisition and data-processing methods are required to answer these new challenges effectively. The recently introduced wide-azimuth data acquisition method offers better illumination and noise attenuation as well as an opportunity to more accurately determine velocities for imaging. One of the most advanced tools for depth imaging

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11

Pan, Yudi, and Lingli Gao. "Random objective waveform inversion of surface waves." GEOPHYSICS 85, no. 4 (2020): EN49—EN61. http://dx.doi.org/10.1190/geo2019-0613.1.

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Full-waveform inversion (FWI) of surface waves is becoming increasingly popular among shallow-seismic methods. Due to a huge amount of data and the high nonlinearity of the objective function, FWI usually requires heavy computational costs and may converge toward a local minimum. To mitigate these problems, we have reformulated FWI under a multiobjective framework and adopted a random objective waveform inversion (ROWI) method for surface-wave characterization. Three different measure functions were used, whereas the combination of one measure function with one shot independently provided one

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12

Behura, Jyoti, and Roel Snieder. "Virtual Real Source: Source signature estimation using seismic interferometry." GEOPHYSICS 78, no. 5 (2013): Q57—Q68. http://dx.doi.org/10.1190/geo2013-0069.1.

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Knowledge of the seismic source signature is crucial in numerousproblems in exploration seismology, especially in full-waveform inversion. However, existing methods of source signature estimation like statistical methods and well-log-based methods suffer from several drawbacks arising from assumptions such as whiteness of the reflectivity series and the minimum-phase character of the wavelet. Also, estimation of the source signature using wave-theoretical methods requires the recording of the wavefield and its normal derivative or additional recordings above the receiver surface which are not

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13

Gras, Clàudia, Daniel Dagnino, Clara Estela Jiménez-Tejero, Adrià Meléndez, Valentí Sallarès, and César R. Ranero. "Full-waveform inversion of short-offset, band-limited seismic data in the Alboran Basin (SE Iberia)." Solid Earth 10, no. 6 (2019): 1833–55. http://dx.doi.org/10.5194/se-10-1833-2019.

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Abstract. We present a high-resolution P-wave velocity model of the sedimentary cover and the uppermost basement to ∼3 km depth obtained by full-waveform inversion of multichannel seismic data acquired with a 6 km long streamer in the Alboran Sea (SE Iberia). The inherent non-linearity of the method, especially for short-offset, band-limited seismic data as this one, is circumvented by applying a data processing or modelling sequence consisting of three steps: (1) data re-datuming by back-propagation of the recorded seismograms to the seafloor; (2) joint refraction and reflection travel-time t

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14

Da Silva, Curt, Yiming Zhang, Rajiv Kumar, and Felix J. Herrmann. "Applications of low-rank compressed seismic data to full-waveform inversion and extended image volumes." GEOPHYSICS 84, no. 3 (2019): R371—R383. http://dx.doi.org/10.1190/geo2018-0116.1.

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Conventional oil and gas fields are increasingly difficult to explore and image, resulting in the call for more complex wave-equation-based inversion algorithms that require dense long-offset samplings. Consequently, there is an exponential growth in the size of data volumes and prohibitive demands on computational resources. We have developed a method to compress and process seismic data directly in a low-rank tensor format, which drastically reduces the amount of storage required to represent the data. Seismic data exhibit a low-rank structure in a particular transform domain, which can be e

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15

Wang, Yilin, Liangguo Dong, Chao Huang, Jianming Zhang, and Jianhua Wang. "Wave-equation reflection traveltime inversion constrained by selected reflection time windows." GEOPHYSICS 90, no. 3 (2025): U15—U30. https://doi.org/10.1190/geo2024-0082.1.

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Wave-equation reflection traveltime inversion is a powerful tool for reconstructing the low wavenumber components of the velocity model. One of the main challenges in reflection traveltime inversion is precisely estimating the reflection traveltime shifts between synthetic and observed data. Crosscorrelation is widely used for estimating reflection traveltime shifts. However, prestack seismic data usually contain multiple primary reflection events, and the reflection traveltime shifts are nonstationary. Because the global crosscorrelation result is generally dominated by strong reflections in

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16

Faucher, Florian, Giovanni Alessandrini, Hélène Barucq, Maarten V. de Hoop, Romina Gaburro, and Eva Sincich. "Full reciprocity-gap waveform inversion enabling sparse-source acquisition." GEOPHYSICS 85, no. 6 (2020): R461—R476. http://dx.doi.org/10.1190/geo2019-0527.1.

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The quantitative reconstruction of subsurface earth properties from the propagation of waves follows an iterative minimization of a misfit functional. In marine seismic exploration, the observed data usually consist of measurements of the pressure field, but dual-sensor devices also provide the normal velocity. Consequently, a reciprocity-based misfit functional is specifically designed, and it defines the full reciprocity-gap waveform inversion (FRgWI) method. This misfit functional provides additional features compared to the more traditional least-squares approaches, in particular, in that

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17

Ben-Hadj-Ali, Hafedh, Stéphane Operto, and Jean Virieux. "An efficient frequency-domain full waveform inversion method using simultaneous encoded sources." GEOPHYSICS 76, no. 4 (2011): R109—R124. http://dx.doi.org/10.1190/1.3581357.

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Three-dimensional full waveform inversion (FWI) still suffers from prohibitively high computational costs that arise because of the seismic modeling for multiple sources that is performed at each nonlinear iteration of FWI. Building supershots by assembling several sources allows mitigation of the number of simulations per FWI iteration, although it adds crosstalk artifacts because of interference between the individual sources of the supershots. These artifacts themselves can be reduced by encoding each individual source with a random phase shift during assembling of the sources. The source e

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18

Wellington, Paul, Romain Brossier, and Jean Virieux. "Preconditioning full-waveform inversion with efficient local correlation operators." GEOPHYSICS 84, no. 3 (2019): R321—R332. http://dx.doi.org/10.1190/geo2018-0584.1.

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Full-waveform inversion (FWI) is an iterative locally linearized data-fitting technique. The FWI method attempts to move from an initial low-wavenumber representation of earth parameters to a broader representation of the medium. An issue with the method is that FWI is an ill-posed problem, oversampled for the numerical forward discretization. The success of the model parameter reconstruction can often be greatly affected by external factors such as the presence of noise in the input field data or other artifacts arising from the imaging condition present in the FWI gradient computation. We ha

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19

Syamsuddin, Erfan, Sabrianto Aswad, Muhammad Alimuddin Hamzah Assegaf, et al. "Seismic Site Classification Using the Multichannel Analysis of Surface Waves Method." POSITRON 12, no. 2 (2022): 149. http://dx.doi.org/10.26418/positron.v12i2.53869.

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The soil has a variety of qualities that affect its ability to support the weight of a structure. One of these features is soil stiffness, which can be determined using the surface wave method to prevent soil collapse. Multichannel Analysis of Surface Waves (MASW) is one of the non-invasive methodologies used in this study to investigate subsurface structures in North Sumatra, Indonesia. This method utilizes the dispersion properties of Rayleigh waves, producing a dispersion curve to get the shear wave velocity (Vs) through inversion. The shear wave velocity can be used to examine the soil sti

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20

Trevithick, Alex, Matthew Chan, Michael Stengel, et al. "Real-Time Radiance Fields for Single-Image Portrait View Synthesis." ACM Transactions on Graphics 42, no. 4 (2023): 1–15. http://dx.doi.org/10.1145/3592460.

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We present a one-shot method to infer and render a photorealistic 3D representation from a single unposed image (e.g., face portrait) in real-time. Given a single RGB input, our image encoder directly predicts a canonical triplane representation of a neural radiance field for 3D-aware novel view synthesis via volume rendering. Our method is fast (24 fps) on consumer hardware, and produces higher quality results than strong GAN-inversion baselines that require test-time optimization. To train our triplane encoder pipeline, we use only synthetic data, showing how to distill the knowledge from a

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21

Aghayan, Afshin, Priyank Jaiswal, and Hamid Reza Siahkoohi. "Seismic denoising using the redundant lifting scheme." GEOPHYSICS 81, no. 3 (2016): V249—V260. http://dx.doi.org/10.1190/geo2015-0601.1.

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Separating linear coherent noise, such as ground roll from reflections, remains a key challenge in seismic processing. By adapting the redundant lifting scheme (RLS), a wavelet transform method, to seismic data, we have determined how the wavelet domain can be used to suppress coherent and random noise. The RLS operates on a trace-by-trace basis decomposing each time series into wavelet-coefficient (WC) time series and consequently a single gather (in a shot, receiver, or common depth point domain) into a series of WC subgathers (SGs). The decomposition changes the relative magnitude of WCs of

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22

Zhang, Jie, and M. Nafi Toksöz. "Nonlinear refraction traveltime tomography." GEOPHYSICS 63, no. 5 (1998): 1726–37. http://dx.doi.org/10.1190/1.1444468.

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A few important issues for performing nonlinear refraction traveltime tomography have been identified. They include the accuracy of the traveltime and raypath calculations for refraction, the physical information in the refraction traveltime curves, and the characteristics of the refraction traveltime errors. Consequently, we develop a shortest path ray‐tracing method with an optimized node distribution that can calculate refraction traveltimes and raypaths accurately in any velocity model. We find that structure ambiguity caused by short and long rays in the seismic refraction method may infl

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23

Endo, Yuto, Jun Tanida, Makoto Naruse, and Ryoichi Horisaki. "Extrapolated Speckle-Correlation Imaging." Intelligent Computing 2022 (September 30, 2022): 1–8. http://dx.doi.org/10.34133/2022/9787098.

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Imaging through scattering media is a longstanding issue in a wide range of applications, including biomedicine, security, and astronomy. Speckle-correlation imaging is promising for noninvasively seeing through scattering media by assuming shift invariance of the scattering process called the memory effect. However, the memory effect is known to be severely limited when the medium is thick. Under such a scattering condition, speckle-correlation imaging is not practical because the correlation of the speckle decays, reducing the field of view. To address this problem, we present a method for e

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Billette, Frederic, Soazig Le Bégat, Pascal Podvin, and Gilles Lambaré. "Practical aspects and applications of 2D stereotomography." GEOPHYSICS 68, no. 3 (2003): 1008–21. http://dx.doi.org/10.1190/1.1581072.

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Stereotomography is a new velocity estimation method. This tomographic approach aims at retrieving subsurface velocities from prestack seismic data. In addition to traveltimes, the slope of locally coherent events are picked simultaneously in common offset, common source, common receiver, and common midpoint gathers. As the picking is realized on locally coherent events, they do not need to be interpreted in terms of reflection on given interfaces, but may represent diffractions or reflections from anywhere in the image. In the high‐frequency approximation, each one of these events corresponds

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Yu, Cuihong, Cheng Han, and Chao Zhang. "INR Smooth: Interframe noise relation-based smooth video synthesis on diffusion models." PLOS One 20, no. 4 (2025): e0321193. https://doi.org/10.1371/journal.pone.0321193.

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The text-to-video generation task can provide people with rich and diverse video content, but it also has some typical issues, such as content inconsistency between video frames or text alignment failure, which degrade the smoothness of video. And in the process of improving the video smoothing problems, the background texture and artistic expression are often lost because of the excessive smoothing. Based on the above problems, this paper proposes INR Smooth, a type of video smoothing strategy based on the relationship between interframe noise, which can improve the smoothness of most T2V gen

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26

Deng, Zhuofu, Binbin Wang, Heng Guo, Chengwei Chai, Yanze Wang, and Zhiliang Zhu. "Unified Quantile Regression Deep Neural Network with Time-Cognition for Probabilistic Residential Load Forecasting." Complexity 2020 (January 22, 2020): 1–18. http://dx.doi.org/10.1155/2020/9147545.

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Residential load forecasting is important for many entities in the electricity market, but the load profile of single residence shows more volatilities and uncertainties. Due to the difficulty in producing reliable point forecasts, probabilistic load forecasting becomes more popular as a result of catching the volatility and uncertainty by intervals, density, or quantiles. In this paper, we propose a unified quantile regression deep neural network with time-cognition for tackling this challenging issue. At first, a convolutional neural network with multiscale convolution is devised for extract

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27

Mi, Binbin, Jianghai Xia, Chao Shen, Limin Wang, Yue Hu, and Feng Cheng. "Horizontal resolution of multichannel analysis of surface waves." GEOPHYSICS 82, no. 3 (2017): EN51—EN66. http://dx.doi.org/10.1190/geo2016-0202.1.

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The multichannel analysis of surface wave (MASW) method has been effectively and widely used to determine near-surface shear-wave velocity. Horizontal resolution of the MASW method represents the minimum horizontal length of recognizable geologic anomalous bodies on a pseudo-2D S-wave velocity [Formula: see text] section. Accurately assessing the achievable lateral resolution is one of the main issues in lateral variation reconstruction using the MASW method. It is difficult to quantitatively estimate the horizontal resolution of the MASW method because of the many influencing factors, such as

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28

Zwartjes, P., and A. Gisolf. "Fourier reconstruction of marine-streamer data in four spatial coordinates." GEOPHYSICS 71, no. 6 (2006): V171—V186. http://dx.doi.org/10.1190/1.2348633.

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Many methods exist for interpolation of seismic data in one and two spatial dimensions, but few can interpolate properly in three or four spatial dimensions. Marine multi-streamer data typically are sampled relatively well in the midpoint and absolute offset coordinates but not in the azimuth because the crossline shot coordinate is significantly under sampled. We approach the problem of interpolation of marine-streamer data in four spatial dimensions by splitting the problem into a 1D interpolation along the densely sampled streamers and a 3D Fourier reconstruction for the remaining spatial c

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29

Bonazzoli, Marcella, Houssem Haddar, and Tuan-Anh Vu. "On the Convergence Analysis of One-Shot Inversion Methods." SIAM Journal on Applied Mathematics 84, no. 6 (2024): 2440–75. https://doi.org/10.1137/23m1585866.

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Li, Siwei, Alexander Vladimirsky, and Sergey Fomel. "First-break traveltime tomography with the double-square-root eikonal equation." GEOPHYSICS 78, no. 6 (2013): U89—U101. http://dx.doi.org/10.1190/geo2013-0058.1.

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First-break traveltime tomography is based on the eikonal equation. Because the eikonal equation is solved at fixed-shot positions and only receiver positions can move along the raypath, the adjoint-state tomography relies on inversion to resolve possible contradicting information between independent shots. The double-square-root (DSR) eikonal equation allows not only the receivers but also the shots to change position, and thus describes the prestack survey as a whole. Consequently, its linearized tomographic operator naturally handles all shots together, in contrast with the shotwise approac

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Frazer, L. Neil, and Xinhua Sun. "New objective functions for waveform inversion." GEOPHYSICS 63, no. 1 (1998): 213–22. http://dx.doi.org/10.1190/1.1444315.

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Inversion is an organized search for parameter values that maximize or minimize an objective function, referred to here as a processor. This note derives three new seismic processors that require neither prior deconvolution nor knowledge of the source‐receiver wavelet. The most powerful of these is the fourwise processor, as it is applicable to data sets from multiple shots and receivers even when each shot has a different unknown signature and each receiver has a different unknown impulse response. Somewhat less powerful than the fourwise processor is the pairwise processor, which is applicab

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Tura, M. Ali C., Robert J. Greaves, and Wafik B. Beydoun. "Crosswell seismic reflection/diffraction tomography: A reservoir characterization application." GEOPHYSICS 59, no. 3 (1994): 351–61. http://dx.doi.org/10.1190/1.1443597.

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A crosswell seismic experiment at the San Emidio oil field in Bakersfield, California, is carried out to evaluate crosswell reflection/diffraction tomography and image the interwell region to locate a possible pinchout zone. In this experiment, the two wells used are 2500 ft (762 m) apart, and the zone to be imaged is 11 000 ft (3350 m) to 13 000 ft (3960 m) deep. With the considered distances, this experiment forms the first large scale reservoir characterization application of crosswell reflection/diffraction tomography. A subset of the intended data, formed of two common receiver gathers an

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Krishna, Maya Sai Gopala. "LatentStyleGAN: One-Shot Face Face Stylization Using GAN Inversion." INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 09, no. 06 (2025): 1–9. https://doi.org/10.55041/ijsrem50374.

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Image stylization has become a prominent area in computer vision, enabling creative transformations of real-world photos into artistic formats like sketches and cartoons. This paper introduces StyleWeb, a web-based application that allows users to convert ordinary images into stylized outputs in real time. The system integrates two core approaches: sketch generation using traditional image processing techniques and cartoonization powered by a pre-trained AnimeGANv3 model converted into ONNX format for optimized performance. Developed using the Django framework, StyleWeb offers a secure and res

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Sjöberg, Lars E., and Majid Abrehdary. "The uncertainty of CRUST1.0." Journal of Applied Geodesy 15, no. 2 (2021): 143–52. http://dx.doi.org/10.1515/jag-2020-0049.

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Abstract As crustal structure models based on seismic and other data are frequently used as a-priori information for further geophysical and geological studies and interpretations (e. g., for gravity inversion), it is important to accurately document their qualities. For instance, the uncertainties in published crustal structures deeply affect the accuracies of produced Moho contour maps. The qualities in seismic crustal models arise from several factors such as the survey method, the spatial resolution of the survey (for example the spacing of the shot points and the recording stations), and

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Ibrahim, Amr, Paolo Terenghi, and Mauricio D. Sacchi. "Simultaneous reconstruction of seismic reflections and diffractions using a global hyperbolic Radon dictionary." GEOPHYSICS 83, no. 6 (2018): V315—V323. http://dx.doi.org/10.1190/geo2017-0655.1.

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We have developed a new transform with basis functions that closely resemble seismic reflections and diffractions. The new transform is an extension of the classic hyperbolic Radon transform and accounts for the apex shifts of the seismic reflection hyperbolas and the asymptote shifts of the seismic diffraction hyperbolas. The adjoint and forward operators of the proposed transform are computed using Stolt operators in the frequency domain to increase the computational efficiency of the transform. This new transform is used, in conjunction with a sparse inversion algorithm, to reconstruct comm

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Yan, Cui, Junjiao Hu, Yanyu Li, et al. "Motion-corrected free-breathing late gadolinium enhancement combined with a gadolinium contrast agent with a high relaxation rate: an optimized cardiovascular magnetic resonance examination protocol." Journal of International Medical Research 48, no. 10 (2020): 030006052096466. http://dx.doi.org/10.1177/0300060520964664.

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Objective This prospective study investigated the feasibility of an optimized cardiovascular magnetic resonance (CMR) examination protocol using the motion-corrected (MOCO), balanced steady-state free precession (bSSFP), phase-sensitive inversion recovery (PSIR) sequence combined with a gadolinium contrast agent with a high relaxation rate in patients who cannot hold their breath. Methods Fifty-one patients with heart disease underwent CMR examinations twice and these were performed with different late gadolinium enhancement (LGE) imaging sequences (fast low-angle shot [FLASH] sequence vs. MOC

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Langston, Charles A., and Mehari Melak Ayele. "Vertical seismic wave gradiometry: Application at the San Andreas Fault Observatory at Depth." GEOPHYSICS 81, no. 3 (2016): D233—D243. http://dx.doi.org/10.1190/geo2015-0404.1.

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We have developed vertical seismic wave gradiometry (VSWG) to estimate velocity, impedance, and attenuation structure in the vicinity of boreholes using borehole array waveforms of check-shot explosions near the borehole head. We have extended wave gradiometry (WG) theory from a purely local relation of the wavefield and wavefield spatial gradient to one that incorporated the ray ansatz over the length of the borehole for a traveling wave in a vertically inhomogeneous medium. We checked the ray assumption against acoustic full-wave synthetic seismograms, and it was found to yield robust measur

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Hao, Jinkun, Junshu Tang, Jiangning Zhang, et al. "ID-Sculpt: ID-aware 3D Head Generation from Single In-the-wild Portrait Image." Proceedings of the AAAI Conference on Artificial Intelligence 39, no. 3 (2025): 3383–91. https://doi.org/10.1609/aaai.v39i3.32350.

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While recent works have achieved great success on one-shot 3D common object generation, high quality and fidelity 3D head generation from a single image remains a great challenge. Previous text-based methods for generating 3D heads were limited by text descriptions and image-based methods struggled to produce high-quality head geometry. To handle this challenging problem, we propose a novel framework, ID-Sculpt, to generate high-quality 3D heads while preserving their identities. Our work incorporates the identity information of the portrait image into three parts: 1) geometry initialization,

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Hall, Walter A., Haiying Liu, Alastair J. Martin, Robert E. MAxwell, and Charles L. Truwit. "Brain biopsy sampling by using prospective stereotaxis and a trajectory guide." Journal of Neurosurgery 94, no. 1 (2001): 67–71. http://dx.doi.org/10.3171/jns.2001.94.1.0067.

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Object. The authors describe their initial results obtained using a skull-mounted trajectory guide for intraoperative magnetic resonance (MR) imaging—guided brain biopsy sampling. The device was used in conjunction with a new methodology known as prospective stereotaxis for surgical trajectory alignment. Methods. Between January 1999 and March 2000, 38 patients underwent 40 brain biopsy procedures in which prospective stereotaxis was performed with the trajectory guide in a short-bore 1.5-tesla MR imager. In most cases, orthogonal T2-weighted half-Fourier acquisition single-shot turbo spin—ech

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de Bruin, C. G. M., C. P. A. Wapenaar, and A. J. Berkhout. "Angle‐dependent reflectivity by means of prestack migration." GEOPHYSICS 55, no. 9 (1990): 1223–34. http://dx.doi.org/10.1190/1.1442938.

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Most present day seismic migration schemes determine only the zero‐offset reflection coefficient for each grid point (depth point) in the subsurface. In matrix notation, the zero‐offset reflection coefficient is found on the diagonal of a reflectivity matrix operator that transforms the illuminating source‐wave field into a reflected‐wave field. However, angle dependent reflectivity information is contained in the full reflectivity matrix. Our objective is to obtain angle‐dependent reflection coefficients from seismic data by means of prestack migration (multisource, multioffset). After downwa

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Carpenter, Chris. "Sub-Basalt Imaging Reveals Deeper Plays Offshore India." Journal of Petroleum Technology 73, no. 02 (2021): 66–67. http://dx.doi.org/10.2118/0221-0066-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 30279, “Revealing Deeper Plays, Offshore Kutch, India: A Success Story of Sub-Basalt Imaging,” by S.K. Biswal, N.N.B. Naidu, and S. Basu, ONGC, et al., prepared for the 2020 Offshore Technology Conference Asia, originally scheduled to be held in Kuala Lumpur, 2-6 November. The paper has not been peer reviewed. Copyright 2020 Offshore Technology Conference. Reproduced by permission. The Deccan Traps volcanic province of India is considered one of the largest basalt-covered regions in the world but i

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Rusconi, Chiara, Erika Ravelli, Livio Gargantini, et al. "Skeletal Involvement in Advanced Stage Lymphomas: Role of Total Body Magnetic Resonance." Blood 110, no. 11 (2007): 4405. http://dx.doi.org/10.1182/blood.v110.11.4405.4405.

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Abstract Introduction: Skeletal localizations is reported in approximately 10–20% of cases of advanced stage malignant lymphomas. Detection of osseous involvement can change clinical stage and consequently determine the choice of treatment. Computed tomography (CT) is considered the gold standard for lymphoma staging and evaluation of treatment response; this technique, however, has a limited sensitivity in identifying extra-nodal disease, especially skeletal localizations. Positron emission tomography (PET) using fluorine-18 (FDG) has a higher sensitivity in recognizing bone involvement and i

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Zigunov, Fernando, and John Charonko. "One-shot omnidirectional pressure integration through matrix inversion." Measurement Science and Technology, August 28, 2024. http://dx.doi.org/10.1088/1361-6501/ad7486.

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Abstract In this work, we present a method to perform 2D and 3D omnidirectional pressure integration from velocity measurements with a single-iteration matrix inversion approach. This work builds upon our previous work, where the rotating parallel ray approach was extended to the limit of infinite rays by taking continuous projection integrals of the ray paths and recasting the problem as an iterative matrix inversion problem. This iterative matrix equation is now ``fast-forwarded'' to the ``infinity'' iteration, leading to a different matrix equation that can be solved in a single {\color{blu

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Wang, Kunxi, Tianyue Hu, and Shangxu Wang. "An unsupervised learning approach to deblend seismic data from denser shot coverage surveys." Geophysical Journal International, June 15, 2022. http://dx.doi.org/10.1093/gji/ggac222.

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Summary The simultaneous source data obtained by simultaneous source acquisition contain crosstalk noise and cannot be directly used in conventional data processing procedures. Therefore, it is necessary to deblend the blended wavefield to obtain the conventionally acquired single-shot recordings. In this study, we propose an iterative inversion method based on the unsupervised deep neural network (UDNN) to deblend the simultaneous source data from a denser shot coverage survey (DSCS). In the common receiver gather (CRG), the coherent effective signals in the blended data of the primary and se

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Huaroc Moquillaza, Elizabeth, Kilian Weiss, Jonathan Stelter, et al. "Accelerated liver water T₁ mapping using single‐shot continuous inversion‐recovery spiral imaging." NMR in Biomedicine, January 25, 2024. http://dx.doi.org/10.1002/nbm.5097.

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PurposeLiver T1 mapping techniques typically require long breath holds or long scan time in free‐breathing, need correction for inhomogeneities and process composite (water and fat) signals. The purpose of this work is to accelerate the multi‐slice acquisition of liver water selective T1 (wT1) mapping in a single breath hold, improving the k‐space sampling efficiency.MethodsThe proposed continuous inversion‐recovery (IR) Look‐Locker methodology combines a single‐shot gradient echo spiral readout, Dixon processing and a dictionary‐based analysis for liver wT1 mapping at 3 T. The sequence parame

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Wang, Kunxi, Tianyue Hu, and Shangxu Wang. "Iterative deblending using unsupervised learning with double deep neural networks." GEOPHYSICS, January 23, 2023, 1–76. http://dx.doi.org/10.1190/geo2022-0299.1.

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Simultaneous source acquisition technology can greatly improve seismic acquisition efficiency. However, due to continuous shooting and serious crosstalk noise of the adjacent sources in seismic data, simultaneous source data cannot be directly used in conventional data processing procedures. Therefore, simultaneous source data need to be deblended to obtain the conventional shot record. Under densely sampled sources (DSSs), we propose a novel unsupervised deep learning (UDL) method based on the double deep neural networks (DDNNs) for iterative inversion deblending of simultaneous source data.

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Zhao, Mingyue, Daming Shen, Lexiaozi Fan, et al. "Incorporation of view sharing and KWIC filtering into GRASP‐Pro improves spatial resolution of single‐shot, multi‐TI, late gadolinium enhancement MRI." NMR in Biomedicine, October 24, 2023. http://dx.doi.org/10.1002/nbm.5059.

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AbstractWhile single‐shot late gadolinium enhancement (LGE) is useful for imaging patients with arrhythmia and/or dyspnea, it produces low spatial resolution. One approach to improve spatial resolution is to accelerate data acquisition using compressed sensing (CS). Our previous work described a single‐shot, multi‐inversion time (TI) LGE pulse sequence using radial k‐space sampling and CS, but over‐regularization resulted in significant image blurring that muted the benefits of data acceleration. The purpose of the present study was to improve the spatial resolution of the single‐shot, multi‐T

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Avram, Alexandru V., Joelle E. Sarlls, and Peter J. Basser. "Whole-Brain Imaging of Subvoxel T1-Diffusion Correlation Spectra in Human Subjects." Frontiers in Neuroscience 15 (June 11, 2021). http://dx.doi.org/10.3389/fnins.2021.671465.

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T1 relaxation and water mobility generate eloquent MRI tissue contrasts with great diagnostic value in many neuroradiological applications. However, conventional methods do not adequately quantify the microscopic heterogeneity of these important biophysical properties within a voxel, and therefore have limited biological specificity. We describe a new correlation spectroscopic (CS) MRI method for measuring how T1 and mean diffusivity (MD) co-vary in microscopic tissue environments. We develop a clinical pulse sequence that combines inversion recovery (IR) with single-shot isotropic diffusion e

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Sun, Jiaxing, Jidong Yang, Zhenchun Li, Jianping Huang, Jie Xu, and Subin Zhuang. "Reflection and diffraction separation in the dip-angle common-image gathers using convolutional neural network." GEOPHYSICS, October 24, 2022, 1–76. http://dx.doi.org/10.1190/geo2022-0157.1.

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In exploration seismology, reflections have been extensively used for imaging and inversion to detect hydrocarbon and mine resources, which are generated from subsurface continuous impedance interfaces. When the interface is not continuous and its size reduces to less than half wavelength, reflected wave becomes diffraction. Both reflections and diffractions can be used to image subsurface targets, and the latter is helpful to resolve small-scale discontinuities, such as fault plane, pinch-out, Karst caves and salt edge. However, the amplitudes of diffractions are usually much weaker than that

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Hartl, S., N. Reinsch, A. Fueting, and K. Neven. "Cerebral safety of two different pulsed field ablation systems for pulmonary vein isolation: the TWOSOME MRI substudy." Europace 27, Supplement_1 (2025). https://doi.org/10.1093/europace/euaf085.478.

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Abstract Background The TWOSOME trial randomized paroxysmal atrial fibrillation (AF) patients to either single-tip or single shot pulsed field ablation (PFA) for pulmonary vein isolation (PVI). Only few data investigating silent cerebral lesions (SCL) after novel PFA technology exist. Purpose In this substudy, patients underwent cerebal magnetic resonance imaging (cMRI) to detect SCL after PFA using two different ablation systems. Methods In this single-center trial, AF patients were prospectively enrolled and 1:1 randomized in the single-tip or single-shot PFA group. Single-tip PVI was perfor

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