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It is shown that ferromagnetic pole pieces can effectively improve the field uniformity of an MRI (magnetic resonance imaging) device. First, the specially designed ferromagnetic pole pieces are placed onto the surfaces of the main permanent-magnet poles to improve the field uniformity preliminarily. Then, the necessary field uniformity is obtained by using the magneto-dipoles which are suitably placed in the field domain. The specially designed pole pieces can increase the field-uniformity by two orders of magnitude.>
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Feng et al. (1992) studied this question.
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