Reconstruction algorithm improving the spatial resolution of Micro-CT
2007
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%.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
0
References
0
Citations
NaN
KQI