通常情况下，你可能首先要坐上扫描检查床，放射科医生会给你一个安装在线缆一端的按钮，所以如果你有任何忧虑你可以及时地向工作人员发出警报。
You'll usually go on the scanner seat first, the radiographer give you a button on the end of a wire, so if you have any concerns you can immediately alert the staff.
CT扫描器包括一个不是特别窄的移动检测床，它可以将人慢慢地拖行至一个环形通道，其形状就像是一个巨大的甜甜圈。
The CT scanner consists of a moving couch, not particularly narrow, that slowly moves a person through a hoop that has a shape of a very large donut.
PET扫描诊断设备也包括可以移动的检测床，它可以慢慢地将人移入一段短短的隧道。
PET scanner also consists of a moving couch that slowly moves a person through a short tunnel.
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