dephasing


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de·phas·ing

(dē-fāz'ing),
In magnetic resonance imaging, following alignment by a radiofrequency pulse, the gradual loss of orientation of the magnetic atomic nuclei due to random molecular energy transfer or relaxation.

dephasing

An MRI term of art referring to the fanning out or loss of phase coherence of signals within the transverse plane.

de·phas·ing

(dē-fāz'ing)
magnetic resonance The gradual loss of orientation of the magnetic atomic nuclei due to random molecular energy transfer or relaxation following alignment by a radiofrequency pulse.
References in periodicals archive ?
Studies on quantum devices are usually performed at low temperatures to enable the use of superconducting materials and to reduce dephasing processes.
The 2D sequence can be obtained with ECG synchronization to provide cine images depicting aortic blood flow, as well as generating dark signal in the setting of dephasing caused by nonlaminar flow associated with valve stenosis or coarctation.
The slow dephasing of the transverse spins will facilitate other quantitative studies of selectively excited metabolites (such as [T.
Hatcher PG, Schnitzer M, Vassallo AM, Wilson MA (1989) The chemical structure of highly aromatic humic acids in three volcanic ash soils as determined by dipolar dephasing NMR studies.
173) and (174)) or when the accumulated dephasing in the x-y plane approaches 2 [pi] The approximations in Eqs.
Their article, titled “Prolonged Spontaneous Emission and Dephasing of Quantum Dot Excitons in Air-Bridged Carbon Nanotubes,” describes an improved fabrication process for carbon nanotubes, potentially leading to brighter light sources and more effective solar cells.
DW-MRI essentially involves T2-weighted MRI sequences during which a dephasing gradient is applied, followed a short while later by a rephasing gradient.
11) Second, I intend to prove that the Hungarian revolution and the 'Polish October can be understood as a dephasing between the post-revolutionary Leninism of Soviet satellites and the emerging Soviet Europeanized Leninism.
However, BOLD-contrast fMRI measures that frequency shift indirectly as signal dephasing and BOSS measures the shift directly.
2]-weighted MRI does not use a refocusing pulse, "so the dephasing caused by the paramagnetic iron is accentuated by the [T*.
International contributors offer short communications and review and research papers on widely-ranging topics in this rapidly-changing or field, covering radio frequency waves dissipated by electron damping in tokamaks (machines producing a toroidal magnetic field for confining a plasma) with elliptic and circular magnetic surfaces, analytical treatments of barrier-type problems and plasma theory, interactions of ion beams with plasmas in terms of energy loss and equipartition sum rules, dephasing in Rydberg plasmas, and quasilinear properties of the Einstein Gauss-Bonnet field equations.
Hatcher PG (1989) The chemical structure of highly aromatic humic acids in three volcanic ash soils as determined by dipolar dephasing NMR studies.