MRI是将患者置于某一强磁场中，该磁场可让患者机体原子核（其运动类似于磁化的陀螺）顺着磁场方向排列。

In MRI, the patient is placed in a strong magnetic field that causes some of his body's atomic nuclei, which act like tiny magnetised spinning tops, to align themselves with the field.

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火成岩具有强磁化率，导致火成岩孔隙内部产生强磁场梯度，使火成岩的核磁测井T2谱发生前移、核磁孔隙度减小；

Igneous rock with strong magnetic susceptibility, leading to strong internal magnetic field gradient, and to T2 spectrum forward and NMR porosity decrease.

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