Abstract
Due to its high spatial resolution, synchrotron radiation x-ray nano-scale computed tomography (nano-CT) is sensitive to misalignments in scanning geometry, which occurs quite frequently because of mechanical errors in manufacturing and assembly or from thermal expansion during the time-consuming scanning. Misalignments degrade the imaging results by imposing artifacts on the nano-CT slices. In this paper, the geometric misalignment of the synchrotron radiation nano-CT has been analyzed by partial derivatives on the CT reconstruction algorithm and a correction method, based on cross correlation and least-square sinusoidal fitting, has been reported. This work comprises a numerical study of the method and its experimental verification using a dataset measured with the full-field transmission x-ray microscope nano-CT at the beamline 4W1A of the Beijing Synchrotron Radiation Facility. The numerical and experimental results have demonstrated the validity of the proposed approach. It can be applied for dynamic geometric misalignment and needs neither phantom nor additional correction scanning. We expect that this method will simplify the experimental operation of synchrotron radiation nano-CT.
Highlights
X-ray computed tomography(X-CT) has enabled the non-destructive observation of internal structures and is a powerful analysis tool
We reported a geometric misalignment correction method for transmission x-ray microscope (TXM) nano-scale X-CT (nano-CT) at Beijing Synchrotron Radiation Facility (BSRF) and its experimental verification
We have analyzed the geometric misalignment in the TXM nano-CT at BSRF and established a correction method for this system
Summary
X-ray computed tomography(X-CT) has enabled the non-destructive observation of internal structures and is a powerful analysis tool. The last group needs neither correction phantom nor additional scanning [20, 21, 24,25,26, 29,30,31] It is based on the reconstructed CT slice images or the recorded original projections. Wang et al developed a LabVIEW-based iterative correction procedure that adjusts the alignment of a gold particle phantom manually by human-computer interaction [19] They are complicated, time-consuming and not convenient in nano-CT. The TXM nano-CT at BSRF operates continuously from 5 keV to 12 keV with fluorescence mapping capability and has a spatial resolution better than 30 nm [15] In this system, stepshoot scanning is used to obtain the projection data because the x-ray detector takes about two seconds to acquire a single image. It would be helpful to simplify the experimental operation of synchrotron radiation nano-CT and push its future applications
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