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.

 
  • 比方說(shuō),當一個(gè)表面線(xiàn)圈向均勻的水介質(zhì)發(fā)射矩形射頻脈沖的時(shí)候,B1 場(chǎng)的振幅有可能在成像物體的不同部位發(fā)生很大的差異。
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