Related Experiment Video
Updated: Mar 28, 2026
10:24
Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
2.9K
A novel approach to correct the coded aperture misalignment for fast neutron imaging
F N Zhang1, H S Hu1, T K Zhang2
1School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
The Review of Scientific Instruments
|January 3, 2016
Summary
Residual watermark in neutron imaging reveals coded aperture location. This finding enables a novel method to correct aperture misalignment, improving image quality and source analysis in fast neutron coded imaging.
Area of Science:
- Neutron imaging
- Coded aperture imaging
- Image reconstruction
Background:
- Aperture alignment is critical in neutron imaging for accurate source reconstruction.
- A "residual watermark" artifact, observed during reconstruction with genetic algorithms (GA), provides information about the coded aperture.
- Previous work suggests residual watermark can indicate coded aperture position relative to the system axis.
Purpose of the Study:
- To analyze the conditions for residual watermark formation.
- To develop a method for correcting aperture misalignment using the residual watermark.
- To establish a novel approach for fast neutron coded imaging aperture correction.
Main Methods:
- Analysis of residual watermark formation conditions.
- Gamma coded imaging experiment for verification.
- Development of a multiple linear regression model using training samples.
- Validation using regression model and verification samples.
Main Results:
- The existence of residual watermark was experimentally verified.
- A multiple linear regression model was established correlating aperture axis, watermark center, and source gray barycenter.
- Aperture misalignment was corrected with an accuracy of approximately 20 μm.
Conclusions:
- Residual watermark is a key characteristic for analyzing coded aperture properties.
- A novel, accurate method for correcting coded aperture misalignment in fast neutron imaging has been established.
- This technique enhances the reliability and precision of neutron imaging systems.
