are fairly low dose X-rays without much apparent risk to you.

剂量相当低对你没什么危险
You also can limit where the X-rays hit the body

你也可以限制X射线照射的位置
and part of that's done by focusing;

身体的一部分接受照射
part of it's done by something called shielding.

另一部分通过一种叫屏蔽的方式免于照射
If you were getting a chest X-ray done

如果你要做一个胸片
they might put an apron on at your waist.

他们可能在你的腰上围一个围裙
That apron contains a very dense material,

围裙由高密度材料制成
and so the X-rays don't penetrate through below your waist.

所以X射线不能穿过你腰部以下的部分
These are all ways that radiologists use

这就是所有放射学者们
to reduce the radiation dose to patients.

来减少病人受到辐射剂量的方法
We talked about being able to see more by looking at different angles.

我们讨论了从不同角度成像获得更多信息
The technology called Computed Tomography or CT

这一技术叫做电脑断层扫描简称CT