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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  that's bringing the patient into the machine.
  可以把病人带到机器中
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  In the machine is this rotating array of X-ray sources and detectors.
  这个机器中有旋转的X射线源和探测器
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  This part spins around. So you bring the patient in, you spin it around,
  病人进入机器 这一部分开始旋转
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  you spin it around, you collect all the images,
  这一部分旋转 收集到所有的影像
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  you bring them in a little father, you spin it around.
  把病人向里送一点 再转一圈
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  Each time each increment that you move the patient in
  每次向前挪动一点
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  you're taking a picture of another slice,
  你就得到了另一个断层的影像
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  and so one could take a three dimensional image of the whole body.
  所以 你能得到整个身体的三维影像
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  Now, because you're just using line sources of radiation
  因为你现在在使用线辐射源
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  one can reduce the amount of radiation
  相比单一的X线片而言
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  that with each individual picture that you take compared to an X-ray.
  可以减少辐射量
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  But you've got to take a lot of these pictures,
  但由于你拍摄了许多张X光片