A Full-waveform Inversion Case Study from Offshore Gabon

Privitera, A.; Ratcliffe, Andrew; Kotova, N.

doi:10.3997/2214-4609.201600830

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…3 Both RTM and FWI methods are specifically designed to manage the high-velocity contrast challenges, particularly in hydrocarbon detection within salt basins. [4][5][6][7] This significant velocity contrast in geological contexts mirrors the challenges encountered in brain imaging beneath the skull bones. This scenario in brain imaging is analogous, with the skull bones, much like salt bodies, presenting a similar high-velocity barrier to the underlying tissues.…”

Section: Introductionmentioning

confidence: 91%

BrainPuzzle: a new data-driven method for ultrasound brain imaging

Chen,

Fang,

Luo

et al. 2024

Medical Imaging 2024: Ultrasonic Imaging and Tomography

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Current ultrasound imaging techniques face challenges in producing clear brain images, primarily due to the contrast in sound velocity between the skull and brain tissues, and the difficulty in effectively coupling large probes with skulls. The reverse time migration (RTM) technique, known for its effectiveness in the geophysics community, is utilized to address this coupling issue. In addition, we propose the use of smaller probes capable of generating limited ultrasound brain image fragments from various angles. Subsequently, we have developed a new brain imaging method, termed BrainPuzzle, to restore brain images from these limited fragments. Unlike traditional transformer-based image generation models, BrainPuzzle not only uses a transformer to recognize and rearrange the fragments into their correct positions but also integrates a graph convolutional network (GCN) to automatically capture the spatial relationships among the fragments, thereby enhancing the model's capabilities. Furthermore, we introduce the concept of using the RTM method to generate these ultrasound brain image fragments. The experimental results based on two distinct sets of generated datasets, demonstrate the exceptional performance of the proposed method in reconstructing the complete brain images from the fragments of ultrasound brain images.

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Section: Introductionmentioning

confidence: 91%

BrainPuzzle: a new data-driven method for ultrasound brain imaging

Chen,

Fang,

Luo

et al. 2024

Medical Imaging 2024: Ultrasonic Imaging and Tomography

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“…Combined with larger offsets, these low frequencies (LF) are a prerequisite to successful application of full‐waveform inversion that unravels the complex velocities of the sub‐surface (Privitera et al . ).…”

Section: Introductionmentioning

confidence: 97%

“…The contribution of the lowest frequencies does not relate only to a sharp imaging of the deeper levels, particularly those previously masked by high-impedance layers of complex shape (e.g., salt pillows or volcanic flows; Ziolkowski et al 2003). Combined with larger offsets, these low frequencies (LF) are a prerequisite to successful application of full-waveform inversion that unravels the complex velocities of the sub-surface (Privitera et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Marine, seabed, and land seismic equipment for broadband acquisition: a review

Mougenot¹

2017

Geophysical Prospecting

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The broadband capabilities of marine, seabed, and land seismic equipment are reviewed with respect to both the source and the receiver sides. In marine acquisition, the main issue at both ends of the spectrum relates to ghosts occurring at the sea surface. Broadband deghosting requires towing at variable depth to introduce notch diversity or using new equipment like multi‐component and/or low‐noise streamers. As a result, a doubling of the bandwidth from about three to six octaves (2.5–200 Hz) has been achieved. Such improvement is not yet observed for seabed surveys in spite of deghosting being a standard process on the receiver side. One issue may be related to the coupling of the particle motion sensor, particularly at high frequencies. For land acquisition, progress came from the vibrators. New shakers and control electronics using broadband sweeps made it possible to add two more octaves to the low‐frequency signal (from 8 to 2 Hz). Whereas conventional 10 Hz geophones are still able to record such low frequencies, 5 Hz high gain geophones or digital accelerometers enhance them to keep the signal above the noise floor. On the high end of the bandwidth, progress is not limited by equipment specifications. Here, the issue is related to a low signal‐to‐noise ratio due to the strong absorption that occurs during signal propagation. To succeed in enlarging the bandwidth, these improved equipment and sweeps must be complemented by a denser spatial sampling of the wavefield by point–source and point–receiver acquisition.

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A refraction/reflection full-waveform inversion case study from North West Shelf offshore Australia

Dickinson

Mancini

et al. 2017

SEG Technical Program Expanded Abstracts 2017

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A Full-waveform Inversion Case Study from Offshore Gabon

Cited by 4 publications

References 8 publications

BrainPuzzle: a new data-driven method for ultrasound brain imaging

BrainPuzzle: a new data-driven method for ultrasound brain imaging

Marine, seabed, and land seismic equipment for broadband acquisition: a review

A refraction/reflection full-waveform inversion case study from North West Shelf offshore Australia

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