For example, when a surface coil is used to transmit a rectangular RF pulse into a uniform water phantom, the amplitude of the B1field can vary by several-fold across the imaged object.

 
  • 比方说,当一个表面线圈向均匀的水介质发射矩形射频脉冲的时候,B1 场的振幅有可能在成像物体的不同部位发生很大的差异。
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