Current computed tomography (CT) scanners rotate fast to reduce motion artifact. X-ray tube must work in a high power to make\nthe image clear under short exposure time. However, the life span of such a tube may be shortened. In this paper, we propose a\nnovel double sources CT imaging system, which puts two of the same X-ray sources closely with each other.The system is different\nfrom current dual source CT with orthogonal X-ray sources. In our system, each projection is taken twice by these two sources to\nenhance the exposure value and then recovered to a single source projection for image reconstruction. The proposed system can\nwork like normal single source CT system, while halving down the working power for each tube
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