Magnetic-Resonance Imaging of High-Pressure Carbon Dioxide Displacement: Fluid/Surface Interaction and Fluid Behavior

SPE Journal ◽  
2018 ◽  
Vol 23 (03) ◽  
pp. 772-787 ◽  
Author(s):  
Armin Afrough ◽  
M.. Shakerian ◽  
M. S. Zamiri ◽  
Bryce MacMillan ◽  
Florea Marica ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Carbon Dioxide ◽  
Magnetic Resonance ◽  
Heavy Oil ◽  
Transverse Relaxation Time ◽  
Surface Interaction ◽  
Resonance Imaging ◽  
Fluid Saturation ◽  
Magnetic Resonance Imaging Mri ◽  
Carbon Dioxide Co2

Summary Magnetic-resonance imaging (MRI) provides a wealth of information on petroleum-flooding-displacement mechanisms and in-situ pore-level behavior. This study demonstrates MRI methods that have potential for studying the mechanisms of carbon dioxide (CO2) displacement processes in Berea core plugs during the recovery of decane and heavy oil. The correlation between fluid saturation and transverse relaxation time (T2) revealed the contrast in decane/pore-surface interaction between miscible and immiscible drainage of decane by CO2. T2 profiles demonstrated changes in the composition and viscosity of the heavy oil caused by the extraction of light components by CO2.

Lumbar Muscle Activity During Common Lifts: A Preliminary Study Using Magnetic Resonance Imaging

2013 ◽  
Vol 29 (2) ◽  
pp. 147-154 ◽  
Author(s):  
John M. Mayer ◽  
James E. Graves ◽  
Todd M. Manini ◽  
James L. Nuzzo ◽  
Lori L. Ploutz-Snyder
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Muscle Activity ◽  
Transverse Relaxation Time ◽  
Erector Spinae ◽  
Future Research ◽  
Resonance Imaging ◽  
Lumbar Muscle ◽  
Preliminary Study ◽  
Magnetic Resonance Imaging Mri

The purpose of this preliminary study was to assess lumbar multifidus, erector spinae, and quadratus lum-borum muscle activity during lifts as measured by changes in transverse relaxation time (T2) from magnetic resonance imaging (MRI). Thirteen healthy adults performed dynamic squat, stoop, and asymmetric stoop lifts at a standard load, with each lift followed by MRI. Increase in T2 for the multifidus and erector spinae was greater for the stoop than squat. No difference in T2 increase was noted between the multifidus and erector spinae for the squat or stoop. Increase in T2 for the contralateral multifidus was less for the asymmetric stoop than stoop. Future research using MRI and other biomechanical techniques is needed to fully characterize lumbar muscle activity during lifts for various populations, settings, postures, and loads.

scholarly journals A PREDICTIVE MODEL FOR THE ESTIMATION OF CARBON DIOXIDE EMISSIONS OF MAGNETIC RESONANCE IMAGING (MRI) UNITS AND COMPUTED TOMOGRAPHY (CT) SCANNERS

2019 ◽  
pp. 172-187
Author(s):  
Giorgos Kouropoulos
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Carbon Dioxide ◽  
Mathematical Model ◽  
Magnetic Resonance ◽  
Statistical Data ◽  
Statistical Prediction ◽  
Resonance Imaging ◽  
Ct Scanners ◽  
Magnetic Resonance Imaging Mri

The scope of the specific study is the statistical prediction of the annual carbon dioxide use emissions due to the operation of computed tomography (CT) scanners and magnetic resonance imaging (MRI) units in hospitals, health units and diagnostic centers, for the period between 2018 and 2030, in 120 countries across the world. The main sources of information for this study comprise statistical data from international organizations, scientific articles and measurements. The basic calculation tool of the study is a mathematical model, modified in such a way so that the calculations can be carried out using the available statistical data. In the final stage of the study, the functions that predict the carbon dioxide use emissions in relation to the years, will be extracted. Furthermore, all the errors and uncertainties of the mathematical model will be estimated. The conclusion, arising after implementation of the calculations, is that the carbon dioxide use emissions of CT scanners and MRI units are expected to grow by 30%, i.e., from 0.344 gigatonnes in 2018 to 0.497 gigatonnes in 2030.

Top-Ten Tips for Imaging the Brachial Plexus with Ultrasound and MRI

2019 ◽  
Vol 23 (04) ◽  
pp. 405-418 ◽  
Author(s):  
James F. Griffith ◽  
Radhesh Krishna Lalam
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Brachial Plexus ◽  
Muscle Denervation ◽  
Resonance Imaging ◽  
Neural Injury ◽  
Clinical Indications ◽  
Magnetic Resonance Imaging Mri ◽  
High Level ◽  
Extensive Involvement

AbstractWhen it comes to examining the brachial plexus, ultrasound (US) and magnetic resonance imaging (MRI) are complementary investigations. US is well placed for screening most extraforaminal pathologies, whereas MRI is more sensitive and accurate for specific clinical indications. For example, MRI is probably the preferred technique for assessment of trauma because it enables a thorough evaluation of both the intraspinal and extraspinal elements, although US can depict extraforaminal neural injury with a high level of accuracy. Conversely, US is probably the preferred technique for examination of neurologic amyotrophy because a more extensive involvement beyond the brachial plexus is the norm, although MRI is more sensitive than US for evaluating muscle denervation associated with this entity. With this synergy in mind, this review highlights the tips for examining the brachial plexus with US and MRI.

Use of Magnetic Resonance Imaging (MRI) to Determine the 3D Geometry in the Human Rectum

Endoscopy ◽  
2004 ◽  
Vol 36 (10) ◽  
Author(s):  
BP McMahon ◽  
JB Frøkjær ◽  
A Bergmann ◽  
DH Liao ◽  
E Steffensen ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
3D Geometry ◽  
Human Rectum ◽  
Magnetic Resonance Imaging Mri

Magnetic resonance imaging in study of lungs

2019 ◽  
pp. 10-23
Author(s):  
T. A. Akhadov ◽  
S. Yu. Guryakov ◽  
M. V. Ublinsky
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Medical Society ◽  
Resonance Imaging ◽  
Iodinated Contrast ◽  
Long Time ◽  
Women And Children ◽  
Magnetic Resonance Imaging Mri ◽  
A Current ◽  
Lung Mri

For a long time, there was a need to apply magnetic resonance imaging (MRI) technique for lung visualization in clinical practice. The development of this method is stimulated by necessity of the emergence of an alternative to computed tomography, especially when radiation and injection of iodine-containing contrast agents are contraindicated or undesirable, for example, in pregnant women and children, people with intolerance to iodinated contrast. One of the reasons why lung MRI is still rarely used is lack of elaborated standardized protocols that would be adapted to clinical needs of medical society. This publication is a current literature review on the use of MRI in lung studies.

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