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Gamma-ray CT from incomplete projections for two-phase pipe flow
1Beijing University of Civil Engineering and Architecture, Beijing, People's Republic of China.
The Review of Scientific Instruments
|March 3, 2017
Summary
A low-dose gamma-ray computed tomography (CT) system was developed for gas-liquid two-phase pipe flow measurement. The system successfully reconstructs images from incomplete projections, enabling effective flow monitoring.
Area of Science:
- Nuclear Engineering
- Imaging Science
- Fluid Dynamics
Background:
- Gas-liquid two-phase flow measurement is crucial for industrial processes.
- Traditional methods face limitations in accuracy and safety.
- Gamma-ray computed tomography (CT) offers a non-invasive alternative.
Purpose of the Study:
- To develop and evaluate a low-energy, low-dose gamma-ray CT system for two-phase pipe flow.
- To improve image reconstruction from incomplete projections.
- To optimize scanning parameters and reduce radiation dose.
Main Methods:
- Utilized a third-generation X-ray CT configuration with a 241Am source and CdZnTe detectors.
- Implemented an A-variable algebraic reconstruction technique (ART) for image reconstruction.
- Conducted static and dynamic experiments with full and partial scan data.
Main Results:
- Achieved a spatial image resolution of approximately 7 mm.
- Demonstrated successful image reconstruction from incomplete projections.
- Identified acceptable performance for flow rates < 0.04 m/s at imaging speeds < 33 frames/s.
Conclusions:
- The developed gamma-ray CT system is feasible for two-phase pipe flow measurement.
- Image reconstruction from incomplete projections is viable, reducing scanning time and dose.
- The system provides a promising tool for industrial flow monitoring and optimization.
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