Systems and techniques for acquiring a medical image of a region of interest are described. A plurality of electromagnetic excitation pulses are applied to the region of interest according to predetermined parameters, and a predetermined delay period is introduced after which the longitudinal magnetization of a first species generated within the region of interest reaches zero and a longitudinal magnetization of a second species generated within the region of interest is in steady-state.

 
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> Split type NMR superconductive magnet device and NMR apparatus for solution analysis with different current directions and a permanent current switch

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