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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  So, today we're going to continue talking about imaging.
  好的 今天我们继续讲影像学
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  Last Tuesday--on Tuesday
  在上周四
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  I talked mainly about imaging using X-rays
  我主要讲的是利用X线成像
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  and the conventional sorts of X-ray which a chest X-ray
  较简便的一种X线成像方式是胸片
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  which leads to a projected image.
  这是一种投影
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  So, you understand the limitations of projected images,
  你们已经明白这种成像方式的局限性
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  and from X-rays something about the physics of
  X线之所以能够成像
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  how an X-ray image is formed based on
  其物理原理是基于
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  X-rays passing through your body.
  X线会穿过你的身体的特性
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  Depending on what tissues,
  这个过程取决于组织的类型