Objective: to establish a curve of dosage gradient liver signal intensity of superparamagnetic iron oxide (SPIO) in normal rats and to find an appropriate dose for enhancement.

目的：研究正常大鼠肝脏磁共振的超顺磁性氧化铁(SPIO)剂量梯度-肝脏信号曲线，寻找合适的增强剂量。

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Objective To evaluate the value of superparamagnetic iron oxide (SPIO) -enhanced magnetic resonance (MR) imaging in the diagnoses of focal liver lesions.

目的评价超顺磁氧化铁(SPIO)增强MR成像对肝脏占位性病变的诊断价值。

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