来自《耶鲁大学开放课程：生物医学工程探索 第21集 第21集》

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  is the relaxation of these
  那些这些处于激发态的分子
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  excited molecules back to their aligned state.
  回到有序排列的状态时所释放出的能量
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  You can measure that because as these molecules are processing
  你们能够检测它是因为这些分子在过程中
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  they're emitting radio frequency radiation which you can detect.
  会释放出电磁辐射 你能够检测到
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  Now, this involves magnetic fields, strong magnetic fields.
  这项技术涉及到磁场 很强的磁场
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  It involves radio frequency radiation, the kind of radiation
  还涉及到电磁波辐射 这种辐射就是
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  that radio stations use to broadcast signals
  广播电台就用这种辐射来传播信号
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  that are picked up by antennas.
  天线能够接受这种辐射信号
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  These are generally presumed to be safe for biological tissues.
  通常情况下 这种辐射对生物很安全
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  There's no ill effects that we know of, of exposure to magnetic fields
  据我们所知 暴露在磁场中
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  or radio frequency radiation at these wavelengths.
  或者这种波长的电磁辐射下并不会致病
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  So, it doesn't have the same concerns
  所以 我们不用担心会有