Objective To investigate the difference in imaging quality and X ray dose for plain film of lumbar vertebrae and abdomen when using blue screen or green screen.

目的探讨感蓝、感绿不同的屏片体系，在腰椎和腹部平片上形成影像质量及入射剂量的差异。

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VCT obtained isotropic high resolution while reducing patient doses through the improvement of X ray detection efficiency to truly realize the goal of balancing high quality images and low X ray dose.

VCT在实现各向同性高分辨率的同时努力提高X射线的有效利用率，降低病人剂量，真正实现了高图像质量和低剂量的和谐。

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They found spots where radiation levels exceeded 100 microsieverts per hour, about the same dose as a chest X-ray.

他们发现辐射量已经超过了每小时100微西弗，这和做一次胸透所承受的辐射量相当。

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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.

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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.

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"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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