来自《耶鲁大学开放课程：生物医学工程探索 第20集 第20集》

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  and that change the way we can see inside the body.
  一改我们检视身体的方式
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  I'm going to talk about sort of a snap shot of what's available now,
  我们会简要地讲一讲现有的技术
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  and as I said, illustrate or talk about what some
  并且如我之前所说 还要阐明
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  of the problems are or challenges with each,
  每种技术各自的问题与挑战所在
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  what are the limitations in particular.
  特别是有什么局限性
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  An image is a visual representation of some measurable property
  影像是一种对某些可量度属性的视觉呈现
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  of a person, an object, or a phenomenon.
  可以是对一个人 一个物或一种现象
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  We're going to be thinking about medical imaging,
  我们主要考虑的是医学造影
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  so we're going to be thinking mainly about images of people.
  所以我们重点在人体的成像
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  Images can be formed and displayed in different ways
  图像可以通过不同的方式来拍摄和呈现
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  depending on properties of the object and properties of the imaging system
  选用的方式取决于你拍摄的什么物体
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  that you're using to create the image.
  以及成像系统的属性