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1. In these nonuniform fields the coil voltage caused by the excitation of an RF pulse rapidly decays to zero, but it can be recovered some time later by applying a second pulse.
   在不均匀磁场内，射频脉冲导致的电波很快会消失，但如果隔一段时间后再提供第二次脉冲，又会重新出现。