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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  It can also tell the difference
  它也能够用来分辨
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  between saturated and desaturated blood.
  饱和血液和去饱和血液之间的不同
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  What's saturated blood?
  什么是饱和血液
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  Here, I mean blood that's saturated with oxygen,
  这里 我的意思是饱含氧气的血液
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  so it's loaded up with oxygen;
  这种血液中富含氧气
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  desaturated blood is blood that's had the oxygen removed.
  去饱和血液中的氧气已经被用掉了
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  Now, if you can measure blood flow
  现在 如果你能测量血液的流速
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  and you can measure differences
  并且能分辨出
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  between saturated and desaturated blood,
  饱和血液和去饱和血液之间的不同
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  that means that you can monitor within a small region of tissue
  你就可以监控 有多少血液
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  how much blood flow is going through,
  流过这一小片区域
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  how much oxygen is being consumed.
  消耗了多少氧气