Optimization study of some neutron imaging parameters in a reactor based neutron radiography facility

Rezazadeh, Marzieh; Jafari, Hamid; Feghhi, S.A.H.; Omidi, Zohre; Gholamzadeh, Zohreh

doi:10.1016/j.pnucene.2015.11.004

Cited by 10 publications

(2 citation statements)

References 10 publications

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“…Improvement of spatial resolution requires optimization of collimator length (𝐿) and aperture diameter (𝐷). The neutron imaging resolution can be improved by increasing the distances of the detector and sample position from the neutron source [5]. Calculation of the 𝐿/𝐷 ratio through geometrical configuration is not accurate enough, while the 𝐿/𝐷 ratio can be evaluated from the imaging result.…”

Section: Introductionmentioning

confidence: 99%

Determination of neutron image quality of compact collimator facility for non-destructive testing

Chulapakorn¹,

Wonglee²,

Pornroongruengchok³

et al. 2021

J. Inst.

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Neutron imaging, based on a digital-based detector system, was developed for non-destructive internal inspection at the Thai Research Reactor-1/Modification 1 (TRR-1/M1). Neutron activation analysis was employed to determine thermal-neutron flux at the imaging position. The facility provided flux of thermal neutrons at 2.5× 105 cm−2s−1. Several standard samples were used to evaluate the collimation ratio (L/D), resolution, and unsharpness for the current setup of neutron imaging. An analytical method was employed to determine image quality parameters to moderate neutron flux. The L/D ratio depends on the aperture size of the divergent collimator and can be amended by using appropriate sample shape, resulting in more accurate estimate of collimation parameters. Resolution and unsharpness for neutron tomography were 0.5 mm and 1 mm, respectively. Results suggested the possibility of evaluating image quality using samples with non-complex structure.

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Section: Introductionmentioning

confidence: 99%

Determination of neutron image quality of compact collimator facility for non-destructive testing

Chulapakorn¹,

Wonglee²,

Pornroongruengchok³

et al. 2021

J. Inst.

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“…Neutron radiography has been widely used in various fields of research and Non-Destructive Testing (NDT) [1][2][3]. At the GA Siwabessy…”

Section: Introduction mentioning

confidence: 99%

A Novel Technique for Removal of High Density White Spot Noise from Digital Neutron Radiographic Images

2018

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This paper proposes a novel technique of adaptive switching alternative median (ASAM) filter for high-density white spot noise removal. The ASAM filter is composed of two blocks filtering, namely main and secondary block filtering, respectively. The proposed secondary block filtering is a new technique in highdensity impulse noise removal and the main contribution of this research. The ASAM algorithm was tested on the standard 8-bit gray-scale, 512×512 pixel Lena image and a real neutron radiographic image. The results showed significant reduction of white spot noise in both types of images through visual inspection. To measure the performance of noise removal in simulation test we measured the peak signal-to-noise ratio (PSNR), structural similarity (SSIM) index, and denoising time, and in real application tests we measured signal-to-noise ratio (SNR). From the experiments of simulation test, at the highest level noise of 95 % the obtained PSNR and SSIM are 23.584 dB and 0.696 respectively. These are higher than the results of other algorithms that are 16.697 dB and 0.475, respectively, for DBA, 16.696 dB and 0.408 for NAFSM, and 18.860 dB and 0.568 for NASNLM. The denoising times for DBA, NAFSM, NASNLM, and ASAM were obtained as 6.469 s, 5.186 s, 36.735 s, and 5.197 s respectively. From the experiments of real application test we obtained the SNR for DBA, NAFSM, NASNLM, and ASAM as 32.42 dB, 6.01 dB, 18.77 dB, and 32.96 dB, respectively. In general, these results show that ASAM filter is superior to the existing filtering methods. The ASAM filter improved the image restoration quality, especially in removing the highdensity white spot noise, and was able to yield good filtering result which exhibits better PSNR, SSIM, denoising time, and qualitative visual inspection.

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Investigation of geometric effects on fast neutron radiography using IECF

Mehrabi

Vosoughi²,

Salek³

et al. 2023

Annals of Nuclear Energy

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Optimization study of some neutron imaging parameters in a reactor based neutron radiography facility

Cited by 10 publications

References 10 publications

Determination of neutron image quality of compact collimator facility for non-destructive testing

Determination of neutron image quality of compact collimator facility for non-destructive testing

A Novel Technique for Removal of High Density White Spot Noise from Digital Neutron Radiographic Images

Investigation of geometric effects on fast neutron radiography using IECF

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