Extending subsurface imaging beyond ocean-bottom node coverage using multiples: A case study in deepwater Nigeria

2021 ◽  
Vol 9 (4) ◽  
pp. SH67-SH74
Author(s):  
Rasaki Salami ◽  
Abderrahim Lafram ◽  
Didier Lecerf ◽  
Amir Asnaashari
Keyword(s):  
Wave Equation ◽  
Image Quality ◽  
Acquisition Cost ◽  
Imaging Technique ◽  
Turnaround Time ◽  
Ocean Bottom ◽  
Subsurface Imaging

We have evaluated the results of a receiver decimation study in a deepwater context using separated wavefield imaging (SWIM) algorithms to provide extended illumination for imaging without ocean-bottom node (OBN) positioning constraints. We carried out subsurface imaging using the SWIM imaging technique with a reduced OBN layout, and we compared the results with those from conventional one-way wave-equation migration. We found from the results that the SWIM algorithm makes it possible to reduce the OBN layout while obtaining a similar subsurface image with the same shot geometry, which allows a reduced receiver acquisition effort, offers more geometry flexibility without affecting the image quality, with a potentially significant reduction of acquisition cost and 4D processing turnaround time.

scholarly journals Impact of 5D regularization and interpolation on subsurface imaging: A case study of Stratton field, South Texas, United States of America

2020 ◽  
Vol 32 (6) ◽  
pp. 2733-2740
Author(s):  
Maan Al-Gain ◽  
Kamal Abdelrahman ◽  
Ali Kahal ◽  
Saleh Al-Zahrani ◽  
Elkhedr Ibrahim ◽  
...  
Keyword(s):  
United States ◽  
United States Of America ◽  
South Texas ◽  
Subsurface Imaging

MR image quality improvement by zero-filling Fresnel transform imaging technique

2005 ◽  
Author(s):  
Bin Rong Wu ◽  
Satoshi Ito ◽  
Yoshitsugu Kamimura ◽  
Yoshifumi Yamada
Keyword(s):  
Quality Improvement ◽  
Image Quality ◽  
Imaging Technique ◽  
Mr Image ◽  
Image Quality Improvement ◽  
Fresnel Transform

scholarly journals Ocean-Bottom Seismographs Based on Broadband MET Sensors: Architecture and Deployment Case Study in the Arctic

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 3979
Author(s):  
Artem A. Krylov ◽  
Ivan V. Egorov ◽  
Sergey A. Kovachev ◽  
Dmitry A. Ilinskiy ◽  
Oleg Yu. Ganzha ◽  
...  
Keyword(s):  
Site Response ◽  
The Arctic ◽  
Laptev Sea ◽  
Ocean Bottom ◽  
Arctic Seas ◽  
Shirshov Institute ◽  
Study Results ◽  
Ocean Bottom Seismographs ◽  
The Laptev Sea

The Arctic seas are now of particular interest due to their prospects in terms of hydrocarbon extraction, development of marine transport routes, etc. Thus, various geohazards, including those related to seismicity, require detailed studies, especially by instrumental methods. This paper is devoted to the ocean-bottom seismographs (OBS) based on broadband molecular–electronic transfer (MET) sensors and a deployment case study in the Laptev Sea. The purpose of the study is to introduce the architecture of several modifications of OBS and to demonstrate their applicability in solving different tasks in the framework of seismic hazard assessment for the Arctic seas. To do this, we used the first results of several pilot deployments of the OBS developed by Shirshov Institute of Oceanology of the Russian Academy of Sciences (IO RAS) and IP Ilyinskiy A.D. in the Laptev Sea that took place in 2018–2020. We highlighted various seismological applications of OBS based on broadband MET sensors CME-4311 (60 s) and CME-4111 (120 s), including the analysis of ambient seismic noise, registering the signals of large remote earthquakes and weak local microearthquakes, and the instrumental approach of the site response assessment. The main characteristics of the broadband MET sensors and OBS architectures turned out to be suitable for obtaining high-quality OBS records under the Arctic conditions to solve seismological problems. In addition, the obtained case study results showed the prospects in a broader context, such as the possible influence of the seismotectonic factor on the bottom-up thawing of subsea permafrost and massive methane release, probably from decaying hydrates and deep geological sources. The described OBS will be actively used in further Arctic expeditions.

Case Study: A Large 3D Wide-Azimuth Ocean-Bottom Survey in the Deepwater Gulf of Mexico

2007 ◽  
Author(s):  
Richard Clarke ◽  
Ganyuan Xia ◽  
Nurul Kabir ◽  
Laurent Sirgue ◽  
Scott Michell
Keyword(s):  
Gulf Of Mexico ◽  
Ocean Bottom

Evaluation of two point of care technologies for measuring monoclonal antibody therapeutic-A concentrations in blood

Bioanalysis ◽  
2020 ◽  
Vol 12 (20) ◽  
pp. 1449-1458
Author(s):  
Saloumeh K Fischer ◽  
Kathi Williams ◽  
Ian Harmon ◽  
Bryan Bothwell ◽  
Hua Xu ◽  
...  
Keyword(s):  
Monoclonal Antibody ◽  
Real Time ◽  
Point Of Care ◽  
Turnaround Time ◽  
Monitoring Methods ◽  
Sample Collection ◽  
Time Data ◽  
Serum Samples ◽  
Quick Turnaround Time

Aim: Current blood monitoring methods require sample collection and testing at a central lab, which can take days. Point of care (POC) devices with quick turnaround time can provide an alternative with faster results, allowing for real-time data leading to better treatment decisions for patients. Results/Methodology: An assay to measure monoclonal antibody therapeutic-A was developed on two POC devices. Data generated using 75 serum samples (65 clinical & ten spiked samples) show correlative results to the data generated using Gyrolab technology. Conclusion: This case study uses a monoclonal antibody therapeutic-A concentration assay as an example to demonstrate the potential of POC technologies as a viable alternative to central lab testing with quick results allowing for real-time decision-making.

Process Improvements to Decrease Pharmacy Turnaround Time

2001 ◽  
Vol 36 (7) ◽  
pp. 750-752
Author(s):  
Gary F. Kilsdonk ◽  
Lori W. Henke ◽  
Diana L. Perley
Keyword(s):  
Community Hospital ◽  
Turnaround Time ◽  
Order Entry ◽  
Pharmacy Staff ◽  
Staff Morale ◽  
Process Improvements ◽  
Working Through

This case study will describe the steps taken to improve pharmacy turnaround times at a 450-bed community hospital. Working through a pharmacy/nursing committee, the pharmacy implemented changes to streamline the order entry process and reorganize workflow. An upgrade of unit-based dispensing cabinets improved floorstock levels and pharmacy control over this stock. Gains were made by faxing medication orders to pharmacy and by decentralizing pharmacy staff during peak hours. Turnaround times ranged between 80 to 147 minutes before the changes and 26 minutes to 33 minutes following the changes. Pharmacist turnover decreased and staff morale improved.

scholarly journals Sonographic Findings in Adult Congenital Madelung Deformity: A Case Study

2019 ◽  
Vol 36 (1) ◽  
pp. 65-71
Author(s):  
Viviane Créteur ◽  
Afarine Madani ◽  
Stefano Bianchi
Keyword(s):  
Distal Radius ◽  
Imaging Technique ◽  
Distal Radioulnar Joint ◽  
Pronator Quadratus ◽  
Correlative Imaging ◽  
Madelung Deformity ◽  
Cortical Defect ◽  
Adult Congenital ◽  
Rare Malformation

This case study describes six sonographic findings, with correlative imaging, in an adult patient with congenital Madelung deformity. Two are typical of congenital Madelung deformity: a thick volar hyperechoic band extending from the ulnar side of the distal radius toward the lunate-triquetrum area, the so-called Vickers ligament, adjacent to the radiotriquetral ligament, and a cortical defect on the ulnar and volar side of the distal radius. Other findings may be also observed, such as a narrowed distance between the Lister tubercle and the distal radioulnar joint, a dorsal subluxation of the ulnar head, an extensor tendons entrapment and pronator quadratus modifications. Although the diagnosis of congenital Madelung deformity is based usually on clinical examination, this rare malformation may remain undiscovered until adulthood. When sonography is used as the first imaging technique, the sonographic findings of congenital Madelung deformity can facilitate diagnosis and the appropriate radiographs.

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