The size of detector collimating aperture has great influence on the quality of CT(computer tomography) reconstruction images. The main effects are the fuzziness of the edge of the reconstruction images and low signal-to-noise ratio because of the drop-out of the high frequency information. In this article, the influencing factors above are quantitatively analyzed. Meanwhile, according to the practical ICT（industry computerized tomography）system, the method of inverse filtering are adopted to reduce the above influence in order to improve the quality of the reconstruction images.
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