Magnetic resonance described in the excitation dependent rotating frame of reference

2008 ◽  
Author(s):  
Bahman Tahayori ◽  
Leigh A. Johnston ◽  
Iven M.Y. Mareels ◽  
Peter M. Farrell
Keyword(s):  
Magnetic Resonance ◽  
Frame Of Reference ◽  
Rotating Frame

scholarly journals Early gene therapy–induced apoptotic response in BT4C gliomas by magnetic resonance relaxation contrast T1 in the rotating frame

2002 ◽  
Vol 9 (4) ◽  
pp. 338-345 ◽  
Author(s):  
Juhana M Hakumäki ◽  
Olli H J Gröhn ◽  
Kristiina Tyynelä ◽  
Piia Valonen ◽  
Seppo Ylä-Herttuala ◽  
...  
Keyword(s):  
Gene Therapy ◽  
Magnetic Resonance ◽  
Early Gene ◽  
Rotating Frame ◽  
Apoptotic Response ◽  
Resonance Relaxation

scholarly journals Turbulent structures in cylindrical density currents in a rotating frame of reference

2018 ◽  
Vol 19 (6) ◽  
pp. 463-492 ◽  
Author(s):  
Jorge S. Salinas ◽  
Mariano I. Cantero ◽  
Enzo A. Dari ◽  
Thomas Bonometti
Keyword(s):  
Frame Of Reference ◽  
Rotating Frame ◽  
Density Currents ◽  
Turbulent Structures

Spatially Localized Magnetic Resonance Spectroscopy of the Brains of Normal and Asphyxiated Newborns

PEDIATRICS ◽  
1991 ◽  
Vol 87 (3) ◽  
pp. 273-282
Author(s):  
J. Moorcraft ◽  
N. M. Bolas ◽  
N. K. Ives ◽  
P. Sutton ◽  
M. J. Blackledge ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Brain Tissue ◽  
Neurodevelopmental Outcome ◽  
Birth Asphyxia ◽  
Resonance Spectroscopy ◽  
Rotating Frame ◽  
Metabolic Derangement ◽  
Brain Surface ◽  
The Brain

Phase-modulated rotating frame imaging is a modification of magnetic resonance spectroscopy, which uses a linear radiofrequency field gradient to obtain spatially localized biochemical information. Phase-modulated rotating frame imaging was used to study regional cerebral energy metabolism in the brains of 9 normal newborns and 25 newborns after birth asphyxia. Relative concentrations of phosphorus-containing metabolites and intracellular pH were determined for brain tissue at three specified depths below the brain surface for all neonates. Wide variations in metabolite ratios were seen among normal neonates, and considerable metabolic heterogeneity was demonstrated in individual neonates by depth-resolved spectroscopy. Asphyxiated neonates with severe hypoxic-ischemic encephalopathy and a poor neurodevelopmental outcome showed the expected rise in inorganic orthophosphate and fall in phosphocreatine concentrations in both global and spatially localized spectra. Phase-modulated rotating frame imaging showed that metabolic derangement was less in superficial than in deeper brain tissue. The inorganic orthophosphateadenosine triphosphate ratio from 1 to 2 cm below the brain surface was more accurate than any global metabolite ratio for the identification of neonates with a poor short-term outcome. These data are consistent with the known vulnerability of subcortical brain tissue to hypoxic-ischemic injury in the full-term neonate.

scholarly journals Stability of Periodic Planetary-Type Orbits of the General Planar N-Body Problem

1979 ◽  
Vol 81 ◽  
pp. 23-28
Author(s):  
John D. Hadjidemetriou
Keyword(s):  
Periodic Orbits ◽  
Body Problem ◽  
Frame Of Reference ◽  
Rotating Frame ◽  
N Body Problem ◽  
Families Of Periodic Orbits ◽  
Special Case

It is known that families of periodic orbits in the general N-body problem (N≥3) exist, in a rotating frame of reference (Hadjidemetriou 1975, 1977). A special case of the above families of periodic orbits are the periodic orbits of the planetary type. In this latter case only one body, which we shall call sun, is the more massive one and the rest N-1 bodies, which we shall call planets, have small but not negligible masses. The aim of this paper is to study the properties of the families of periodic planetary-type orbits, with particular attention to stability. To make the presentation clearer, we shall start first with the case N=3 and we shall extend the results to N>3. We shall discuss planar orbits only.

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