A novel approach to correctthe coded aperture misalignment for fast neutron imaging
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- A novel approach to correctthe coded aperture misalignment for fast neutron imaging
- 发表刊物：
- Review of Scientific Instruments
- 摘要：
- Aperture alignment is crucial for the diagnosis of neutron imaging because it has significant impact
on the coding imaging and the understanding of the neutron source. In our previous studies on
the neutron imaging system with coded aperture for large field of view, “residual watermark,”
certain extra information that overlies reconstructed image and has nothing to do with the source
is discovered if the peak normalization is employed in genetic algorithms (GA) to reconstruct the
source image. Some studies on basic properties of residual watermark indicate that the residual
watermark can characterize coded aperture and can thus be used to determine the location of coded
aperture relative to the system axis. In this paper, we have further analyzed the essential conditions
for the existence of residual watermark and the requirements of the reconstruction algorithm for
the emergence of residual watermark. A gamma coded imaging experiment has been performed to
verify the existence of residual watermark. Based on the residual watermark, a correction method
for the aperture misalignment has been studied. A multiple linear regression model of the position
of coded aperture axis, the position of residual watermark center, and the gray barycenter of neutron
source with twenty training samples has been set up. Using the regression model and verification
samples, we have found the position of the coded aperture axis relative to the system axis with
an accuracy of approximately 20 μm. Conclusively, a novel approach has been established to
correct the coded aperture misalignment for fast neutron coded imaging.
C 2015 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4939034]
- 合写作者：
- Zhang F N, Hu H S(*)，Zhang T K, et al
- 卷号：
- 58（7）：
- 页面范围：
- 123515-1~123515-12
- 是否译文：
- 否
- 发表时间：
- 2015-01-01