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Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography

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Monochromatic-beam-based dynamic X-ray microtomography based on OSEM-TV algorithm.

Liang Xu^1,2, Rongchang Chen¹, Yiming Yang^1,2

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.

Journal of X-Ray Science and Technology

|August 5, 2017

Summary

This summary is machine-generated.

Reducing X-ray microtomography (CT) projections improves data collection efficiency. An ordered subset expectation maximization-total variation (OSEM-TV) algorithm enhances image quality, enabling practical microstructure analysis.

Keywords:

Image reconstruction techniques X-ray imaging dynamic microtomography limited projections quantitative analysis

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Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions

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Area of Science:

Materials Science
Physics
Imaging Technology

Background:

Dynamic X-ray computed microtomography (CT) enables microstructure evolution observation.
Low flux density limits data collection efficiency in monochromatic-beam CT.
Reducing projection count is key for efficiency but degrades image quality with traditional methods.

Purpose of the Study:

To enhance the efficiency and image quality of monochromatic-beam dynamic X-ray microtomography.
To address the limitations of traditional filtered back projection (FBP) algorithms with reduced projection data.
To enable quantitative and non-destructive analysis of microstructure evolution.

Main Methods:

Development of monochromatic-beam-based dynamic X-ray computed microtomography.
Implementation of an iterative reconstruction method: ordered subset expectation maximization-total variation (OSEM-TV) algorithm.
Comparison of OSEM-TV with the traditional filtered back projection (FBP) algorithm using simulated and experimental data.

Main Results:

Simulated results showed OSEM-TV achieved approximately 1/4 the normalized mean square error compared to FBP.
Experimental results confirmed OSEM-TV's high density resolution, resolving different materials with fewer than 100 projections.
The OSEM-TV algorithm significantly improved image reconstruction quality with reduced projection data.

Conclusions:

The OSEM-TV algorithm effectively overcomes the image quality limitations of reduced projection counts in X-ray microtomography.
Monochromatic-beam dynamic X-ray microtomography combined with OSEM-TV is a practical approach for efficient microstructure analysis.
This method facilitates quantitative, non-destructive analysis of microstructural evolution with improved data collection efficiency and image quality.