Experimental study on long-range blur of radiation imaging system by ring-aperture method

Wang Dongming; You Wenhao; Yang Gaozhao; Zhang Chengjun; Jia Qinggang; Huang Zhanchang; Chen Jinchuan; Ye Fan; Zhang Faqiang; You Haibo

doi:10.11884/HPLPB202537.250211

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Wang Dongming, You Wenhao, Yang Gaozhao, et al. Experimental study on long-range blur of radiation imaging system by ring-aperture method[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250211

Citation:

Wang Dongming, You Wenhao, Yang Gaozhao, et al. Experimental study on long-range blur of radiation imaging system by ring-aperture method[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250211

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Experimental study on long-range blur of radiation imaging system by ring-aperture method

doi: 10.11884/HPLPB202537.250211

1.
National Key Laboratory of Neutron Science and Technology, Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621999, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

Received Date: 2025-07-14
Accepted Date: 2025-09-01
Rev Recd Date: 2025-09-01

Available Online: 2025-09-10

Abstract

Abstract

Background
The radiation imaging technology, as an important diagnostic, has been widely used in scientific devices such as inertial confinement fusion and flash photography. It has been found that unexpected low-frequency components usually exit in the point spread function (PSF) of radiation imaging system, leading to the so-called low-frequency blur or long-range blur. Because of long-range blur, the image grayscale varies nonlinearly with the ray flux, which in turn interferes with the analysis of the object density or the source intensity. An experimental measurement of the low-frequency components is challenging because of the extremely low intensity. The specific sources of low-frequency components are not very clear currently.
Purpose
This study aims to address these challenges by proposing a new experimental method for the low-frequency components. The goal is to ensure the reliability of the measurement data on low-frequency components and to identify the main sources of low-frequency components.
Methods
A series of experiments were conducted on different components of the imaging system. A collimator called ring-aperture is used to modulate the x-ray or optical photons into a circular pattern, which led to a significant increase in the signal strength from low-frequency components by orders of magnitude.
Results
A direct measurement result of the low-frequency components was obtained for the first time, and the measurement lower limit was extended to 10⁻⁶ orders below the peak of PSF. Experiments shown that the surface state of scintillators can have a significant impact on low-frequency components. By blackening the non-light-emitting surface, the low-frequency components caused by scintillator can be reduced by 22%～62%.
Conclusions
The ring- aperture method provides a reliable experimental approach for measuring low-frequency components of PSF. The research results indicate that optical photon transport is an important factor leading to long-range blur. By surface treatment of scintillators, such as blackening and polishing, long-range blur can be effectively suppressed.
- radiation imaging,
- image degradation,
- long-range blur,
- PSF,
- scintillator

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References(19)

References

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