Mr. Bing Li Profile

Bing Li

at Beijing Univ of Aeronautics and Astronautics

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Proceedings Article | 22 February 2008 Paper

Reconstruction algorithm improving the spatial resolution of Micro-CT

Jian Fu, Dongbo Wei, Bing Li, Lei Zhang

Proceedings Volume 6622, 66221N (2008) https://doi.org/10.1117/12.790906

KEYWORDS: Reconstruction algorithms, Spatial resolution, X-ray computed tomography, Nondestructive evaluation, Computer simulations, Detection and tracking algorithms, Sensors, X-ray imaging, X-rays, Bone

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X-ray Micro computed tomography (Micro-CT) enables nondestructive visualization of the internal structure of objects with high-resolution images and plays an important role for industrial nondestructive testing, material evaluation and medical researches. Because the micro focus is much smaller than the ordinary focus, the geometry un-sharpness of Micro-CT projection is several decuples less than that of ordinary CT systems. So the scan conditions with high geometry magnification can be adopted to acquire the projection data with high sampling frequency. Based on this feature, a new filter back projection reconstruction algorithm is researched to improve the spatial resolution of Micro-CT. This algorithm permits the reconstruction center at any point on the line connecting the focus and the rotation center. It can reconstruct CT images with different geometry magnification by adjusting the position of the reconstruction center. So it can make the best of the above feature to improve the spatial resolution of Micro-CT. The computer simulation and the CT experiment of a special spatial resolution phantom are executed to check the validity of this method. The results demonstrate the effect of the new algorithm. Analysis shows that the spatial resolution can be improved 50%.

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