magnetic field gradient


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mag·net·ic field gra·di·ent

in magnetic resonance imaging, a magnetic field that varies with location, superimposed on the uniform field of the magnet, to alter the resonant frequency of nuclei and allow calculation of their spatial position.
Synonym(s): field gradient
References in periodicals archive ?
Caption: Figure 12: Evolution law of magnetic field gradient on surface of welded structure.
There are mainly two forces acting on the MNP of the ferrofluid under magnetic field: (1) the magnetic force, [[??].sub.m], which is generated by the applied magnetic field gradient, and (2) the fluidic force, [[??].sub.s], which is exerted by the suspending medium on a moving MNP.
It was reported that strength of used magnets and magnetic field gradient varies from 70 mT to 2.2 T and from 0.03 T/m to 100 T/m, respectively [3, 9, 12, 18].
The effect is based on transfer of paramagnetic oxygen towards the gradient caused by the magnetic field gradient. It provides fluctuations of local oxygen concentrations in the air and in volatile mixtures with the following changes in combustion of volatiles.
According to this proposal, a space periodic (but static) magnetic field gradient will be generated at the surface of the bottom mirror.
Partially parallel imaging (PPI) has been proposed as complementary function to Fourier preparation by magnetic field gradients [7-11].
This reduction in voxel size is greatly facilitated by using small magnetic field gradient coils that are capable of rapidly generating extremely steep magnetic field gradients (Mayer et al.
The levitation occurs due to the force which a ferrofluid, placed into a magnetic field gradient, exerts upon these bodies.
A recently completed work [19] and subsequent analysis [20] has called attention to the existence of a serious systematic effect produced by the combination of a magnetic field gradient and the well known v X E motional magnetic field acting on the UCN spins by the Bloch-Siegert effect.
Magnetic fie]d intensity and the magnetic field gradient are key variables that affect separation response.
The final step was to use the OPERA-2d magnetostatic analysis software to design a sextupole perturbation for the pole tip of the quadrupole magnet that produced the desired horizontal magnetic field gradient.
As pointed out by Eriez, in the design of a magnetic separator, the magnetic field intensity and the magnetic field gradient are two primary variables which influence separation response.