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Solutions of manganese chloride were force-fed to Sprague-Dawley rats. Magnetic resonance (MR) imaging was performed on (a) syringes containing different concentrations of manganese chloride, (b) rats after force feeding and (c) livers excised after sacrifice of the force-fed rats. Imaging was done with a 0.15-T resistive magnet. Multiple pulse sequences were used and T1 values were calculated. The signal intensity and T1 value obtained from a solution depended on the manganese concentration and the pulse sequence employed. At higher concentrations, no signal was produced due to extreme T2 shortening. Absorbed manganese affected the signal intensities and T1 values of the rats' livers. By appropriate selection of manganese concentration and pulse sequence, ingested manganese can serve as a combined gastrointestinal and hepatic MR contrast agent.
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Zhonghua yi xue za zhi,
