they're emitting radio frequency radiation which you can detect.

会释放出电磁辐射你能够检测到
Now, this involves magnetic fields, strong magnetic fields.

这项技术涉及到磁场很强的磁场
It involves radio frequency radiation, the kind of radiation

还涉及到电磁波辐射这种辐射就是
that radio stations use to broadcast signals

广播电台就用这种辐射来传播信号
that are picked up by antennas.

天线能够接受这种辐射信号
These are generally presumed to be safe for biological tissues.

通常情况下这种辐射对生物很安全
There's no ill effects that we know of, of exposure to magnetic fields

据我们所知暴露在磁场中
or radio frequency radiation at these wavelengths.

或者这种波长的电磁辐射下并不会致病
So, it doesn't have the same concerns

所以我们不用担心会有
that X-ray radiation or other kinds of radiation,

像X线或者其它类似的辐射
which I'll talk about in a few minutes, have.

我待会要讲这几种辐射
This is some examples of MR images.

这些是磁共振成像的例子