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中文摘要：
介绍了窄角扇束工业CT的局部扫描方法,通过源与探测器的平移加旋转实现扫描;研究了CT多次扫描的局部重建算法,从粗略扫描重建的低分辨率图像中圈定感兴趣区域,再进行小步距扫描,重建出高分辨率的图像;提高了检测效率并且只需要更少的时间就可获取高质量的局部图像。
英文摘要：
Introduce local scan method of narrow fan-beam industrial CT which is implemented through translation and rotation of source-deteetor.CT muhi-sean local reconstruction algorithm is also provided.Firstly Region Of Interest （ROI） is determined from low-resolution image which is reconstructed by coarse scan,secondly scan the ROI by small step and reconstruct highresolution image;it improves efficiency of detection and acquires high quality local image,while requiring much less computation.
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