Now the existing direct volume CT methods face two difficulties:first, how to get the projection data to reconstruct the 3D image exactly, including whether the scanning structure is practical;

目前直接体积CT主要存在两大困难：一是如何获得三维图像精确重建所需的投影数据，包括扫描方式的可实现性；

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This invention is related to an image forming device including an optical scanning device which is able to adjust the irradiation from a beam to a vibrating mirror in a simpler means.

本发明涉及一种包含能够以更简单的方式调整光束对振动镜照射的光扫描装置的图像形成装置。

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Efforts are under way in the U.S. to curb overuse of CT scanning in children, including the Image Gently initiative, launched in August 2009 and spearheaded by a coalition of health-care organizations dedicated to changing medical practice.

WSJ: Childhood CT Scans Pose Cancer Risk