1990
DOI: 10.1016/0730-725x(90)90209-k
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Concomitant magnetic field gradients and their effects on imaging at low magnetic field strengths

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Cited by 115 publications
(153 citation statements)
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“…We estimate ε > 6.5 (residual fields add to the applied static field). As expected, in this regime of strong concomitant gradients, Fourier encoding breaks down and the image bears no resemblance to the phantom [5][6][7] . We can generalize our zero-field technique to the case of a uniform ambient field B a , which imposes conditions on both the gradient and π pulses.…”
supporting
confidence: 68%
See 1 more Smart Citation
“…We estimate ε > 6.5 (residual fields add to the applied static field). As expected, in this regime of strong concomitant gradients, Fourier encoding breaks down and the image bears no resemblance to the phantom [5][6][7] . We can generalize our zero-field technique to the case of a uniform ambient field B a , which imposes conditions on both the gradient and π pulses.…”
supporting
confidence: 68%
“…1b. At very low static fields the undesired gradient components perpendicular to B 0 induce severe, essentially intractable image distortions [5][6][7] . The degree of distortion is characterized by a parameter ε = GL/B 0 , where G is the magnitude of the field gradient and L is the image field of view (FOV) 7 .…”
mentioning
confidence: 99%
“…The influence of the concomitant components in low field MRI has been previously described mainly in terms of induced image distortions [36,37]. Here, two specific issues must be considered, firstly -the z dependence of the local value of B (Eq.…”
Section: Simplified 3d Simulationsmentioning
confidence: 99%
“…In Eq. [4], the z-direction is defined as the direction of the main field B 0 . The 1/B 0 and higher-order terms are called concomitant gradient terms and comprise the concomitant magnetic field.…”
Section: Concomitant Magnetic Fieldmentioning
confidence: 99%