Time-resolved undersampled projection reconstruction magnetic resonance imaging of the peripheral vessels using multi-echo acquisition

2005 ◽  
Vol 53 (3) ◽  
pp. 730-734 ◽  
Author(s):  
Jiang Du ◽  
Aiming Lu ◽  
Walter F. Block ◽  
Francis J. Thornton ◽  
Thomas M. Grist ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Projection Reconstruction ◽  
Time Resolved

Manganese transport in the rat optic nerve evaluated with spatial- and time-resolved magnetic resonance imaging

2010 ◽  
Vol 32 (3) ◽  
pp. 551-560 ◽  
Author(s):  
Øystein Olsen ◽  
Anders Kristoffersen ◽  
Marte Thuen ◽  
Axel Sandvig ◽  
Christian Brekken ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Optic Nerve ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Time Resolved ◽  
Manganese Transport

scholarly journals Numerical simulation of time-resolved 3D phase-contrast magnetic resonance imaging

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248816
Author(s):  
Thomas Puiseux ◽  
Anou Sewonu ◽  
Ramiro Moreno ◽  
Simon Mendez ◽  
Franck Nicoud
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Phase Contrast ◽  
Navier Stokes ◽  
Resonance Imaging ◽  
4D Flow Mri ◽  
4D Flow ◽  
Time Resolved ◽  
Contrast Magnetic Resonance ◽  
Flow Mri

A numerical approach is presented to efficiently simulate time-resolved 3D phase-contrast Magnetic resonance Imaging (or 4D Flow MRI) acquisitions under realistic flow conditions. The Navier-Stokes and Bloch equations are simultaneously solved with an Eulerian-Lagrangian formalism. A semi-analytic solution for the Bloch equations as well as a periodic particle seeding strategy are developed to reduce the computational cost. The velocity reconstruction pipeline is first validated by considering a Poiseuille flow configuration. The 4D Flow MRI simulation procedure is then applied to the flow within an in vitro flow phantom typical of the cardiovascular system. The simulated MR velocity images compare favorably to both the flow computed by solving the Navier-Stokes equations and experimental 4D Flow MRI measurements. A practical application is finally presented in which the MRI simulation framework is used to identify the origins of the MRI measurement errors.

scholarly journals Operando magnetic resonance imaging for mapping of temperature and redox species in thermo-electrochemical cells

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Isuru E. Gunathilaka ◽  
Jennifer M. Pringle ◽  
Luke A. O’Dell
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Waste Heat ◽  
Cost Effective ◽  
Low Grade ◽  
Electrochemical Cells ◽  
Resonance Imaging ◽  
Redox Species ◽  
Time Resolved ◽  
Mass Transfer Processes

AbstractLow-grade waste heat is an abundant and underutilised energy source. In this context, thermo-electrochemical cells (i.e., systems able to harvest heat to generate electricity) are being intensively studied to deliver the promises of efficient and cost-effective energy harvesting and electricity generation. However, despite the advances in performance disclosed in recent years, understanding the internal processes occurring within these devices is challenging. In order to shed light on these mechanisms, here we report an operando magnetic resonance imaging approach that can provide quantitative spatial maps of the electrolyte temperature and redox ion concentrations in functioning thermo-electrochemical cells. Time-resolved images are obtained from liquid and gel electrolytes, allowing the observation of the effects of redox reactions and competing mass transfer processes such as thermophoresis and diffusion. We also correlate the physicochemical properties of the system with the device performance via simultaneous electrochemical measurements.

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