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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and the radio waves that are emitted by the ions in your--病人体内离子或原子释放出的电磁波 -
by the atoms in your body to be very close离检测器尽量近一些 -
to the detectors that are measuring it.这样才能检测到信号 -
Because of this, when you're inside,因此 当你处于仪器中时 -
many people--Wilma did you experience this?很多人都会 威尔玛 你有过吗 -
You feel claustrophobic when you're inside the machine当你在设备中时 会有幽闭恐惧症 -
because you're in a very confined space因为你在一个十分狭窄的空间里 -
and the images take some time to acquire.而要生成图像需要一定的时间 -
The quality of the image图像的质量 -
depends on the strength of the magnetic field取决于磁场的强度以及 -
and how long you acquire the image.成像的时间 -
If you have more time to wait you can get a better image,你在里面呆的时间越长 成像质量越高