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Gradient-induced eddy currents

Gradient-pulse-induced eddy currents can distort the line shapes of spectral peaks, particularly in short TE spectra. This problem can make spectra difficult to analyze because analytical fitting functions may not be appropriate. The use of high-performance gradient coils with very short rise and fall times can minimize eddy currents. However, postprocessing of spectra, using a phase-correction derived from an unsuppressed water peak, can improve the quality of spectra where eddy-current-induced distortion is apparent. [Pg.3426]

Jehenson, R, M. Westphal, and N. Schuff, 1990, Analytical Method for the Compensation of Eddy-Current Effects Induced by Pulsed Magnetic Field Gradients in NMR Systems, J. Magnetic Resonance, 90 264-278, 1990. [Pg.630]

The effect of eddy currents induced by preceding gradient pulses Gy, is included in eq. 1 replacing Gy,+ with... [Pg.82]

When the gradients are pulsed, residual fields called eddy currents are induced in the cryostat and other metallic structures. These fields decay with time constants typically in the order of tens of milliseconds, but for eddy currents in the cold cryostat vessel wall they may be hundreds of milliseconds long. Eddy currents can have a devastating effect upon image... [Pg.216]

See other pages where Gradient-induced eddy currents is mentioned: [Pg.160]    [Pg.622]    [Pg.622]    [Pg.160]    [Pg.622]    [Pg.622]    [Pg.283]    [Pg.53]    [Pg.56]    [Pg.205]    [Pg.317]    [Pg.63]    [Pg.145]    [Pg.162]    [Pg.212]    [Pg.183]    [Pg.256]    [Pg.245]    [Pg.620]    [Pg.622]    [Pg.83]    [Pg.174]    [Pg.284]    [Pg.796]   
See also in sourсe #XX -- [ Pg.7 , Pg.24 ]



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