He calculated backward to figure out how big an X-ray dose would be needed to get the kind of images the machines produce.

于是他反向推算了一下扫描仪生成符合机场安检要求的图像所需的X射线剂量。

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Objective:To investigate CT simulation scan in recurrent nasopharyngeal carcinoma to control x-ray dose in visual nervous.

目的：探讨CT模拟在鼻咽癌局部复发适形放疗中控制视神经剂量中的应用价值。

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Methods Using CT performance phantom, dose phantom and X-ray dose survey meter to test all specifications of CT performance that were demanded by the state regulations.

方法使用性能检测模型、剂量模型、剂量仪，按照卫生部规范对CT性能指标逐项检测分析。

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The company says its Single Pose Secure scanner uses an extremely low-dose X-ray, equivalent to spending two minutes on an aircraft.

FORBES: Airport Security

The radiation dose from an individual dental X-ray, Dr Claus points out, has gone down by about half over the past 30 years or so.

ECONOMIST: Confirmation that dental X-rays can be bad for you

"To put that into context, 20mSv is the same dose you get from three computed tomography (X-ray) scans of your chest, roughly, " she told reporters.

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