Theoretical study of a simplified implementation model of a dual-energy technique for computed tomography

Osipov, S. P.; Чахлов, С. В.; Batranin, A. V.; Osipov, O. S.; Trinh, V. B.; Kytmanov, Juriy

doi:10.1016/j.ndteint.2018.04.010

Cited by 9 publications

(9 citation statements)

References 34 publications

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“…Радиографические методы полезны в тех случаях, когда требуется выполнить неразрушающий контроль изделия или когда непосредственный доступ к объекту исследования затруднен или нежелателен. Количество научных публикаций на эту тему как российских, так и зарубежных исследователей остается достаточно высоким, среди них можно отметить [1][2][3][4]. При этом разные авторы используют различные подходы к решению рассматриваемой задачи, и эти подходы могут заметно отличаться в зависимости от конкретной ситуации.…”

Section: оценка эффективности метода гиперплоскостей в задаче частичн...unclassified

Evaluation of the effectiveness of the hyperplane method in the problem of partial identification of an unknown substances

Nazarov

2023

FEMJ

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The problem of partial identification of a homogeneous medium of unknown chemical composition is investigated. The medium is subjected to repeated transillumination by X-ray fluxes collimated in energy and direction. According to the results of measuring the flux density of radiation entering and leaving the medium, it is necessary to establish the difference in the chemical composition of the medium from some in advance given substances. It is assumed that the measurements of radiation fluxes contain errors for which their maximum relative values are known. As a mathematical basis for the study the method of hyperplanes proposed earlier by the author is taken. The results of numerical calculations performed for problems of various dimensions and for a number of groups of specific chemical elements. Numerical estimates have been obtained for several groups of organic substances, under which any two substances will be successfully distinguished from each other by the results one single measurement experiment on transillumination. Using the hyperplane method in the identification problem for groups of organic substances showed enough high efficiency. As a result of computer calculations, it is shown that that any of the 1287 considered pairs of organic substances is well distinguishable if the total relative measurement error of the probing radiation flux does not exceed 9.726 \%. The analysis of the dependence of the mass attenuation coefficients of radiation from the atomic number for all chemical elements of the periodic system has been carried out and conclusions about the behavior of the identification accuracy with an increase in the dimension of the problem were done. A justification is given that the hyperplane method will be effective in solving the problem of identification for other groups of chemical elements and identification accuracy does not get worse as the dimension of the problem increases.

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Section: оценка эффективности метода гиперплоскостей в задаче частичн...unclassified

Evaluation of the effectiveness of the hyperplane method in the problem of partial identification of an unknown substances

Nazarov

2023

FEMJ

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“…To eliminate the noted shift, the dual-energy methods (DEM) are used in computed tomography. The dual-energy methods in computed tomography are based on transillumination of the test object with gamma or X-rays with two energies [35,36] and the subsequent estimation of the EAN and density distributions. The maximum productivity is achieved by the implementation of the DEM [37], in which monoenergetic gamma radionuclides are used as radiation sources.…”

Section: Sections Of Objects With Fragments Differing Inmentioning

confidence: 99%

“…The LAC of radiation acts as an informative parameter in the reconstruction of cross section images, but the representation of the projections in the form (31) allows the necessary modification of the algorithm in order to simultaneously estimate the distributions of density -and EAN -. As a result of the reconstruction, the following distributions are estimated: (32) Estimation of the EAN distribution is carried out by a formula close to [36],…”

Section: Sections Of Objects With Fragments Differing Inmentioning

confidence: 99%

Calculation Model of X-Ray Computed Tomography with Density Assessment Function

Osipov

Yadrenkin

Чахлов

et al. 2021

Russ J Nondestruct Test

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Abstract— A calculation model of X-ray computed tomography with a density assessment function in the geometry of a parallel beam has been proposed. The model includes blocks for simulating and correcting sinograms and reconstructing section images. When generating sinograms, the parameters of the test object, source, and recorder of X-ray radiation have been taken into account. Modeling algorithms are implemented in the MathCad system and tested on virtual test objects.

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“…two acceleration voltages) X-ray CT method (e.g. Bourque, Carrier, and Bouchard 2014;Champley et al 2019;Krauss, Schmidt, and Flohr 2011;Nakashima and Nakano 2020;Osipov et al 2018;Paziresh et al 2016;Rogasik et al 1999;Zheng et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Use of Triple-Exposure X-ray Computed Tomography for Nondestructive Identification of Heavy Elements in Soil Samples

Nakashima

2021

Soil and Sediment Contamination: An International Journal

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For the purpose of the nondestructive measurements of hazardous heavy-element-containing substances in soil samples, the emerging technique, triple-exposure X-ray computed tomography (CT), is proposed. The use of triple exposure (i.e. three different acceleration voltages for the X-ray tube) improves the accuracy of the identification of the atomic number of a heavy element. With lead as the target element, virtual X-ray microtomography simulations utilizing a polychromatic X-ray source accelerated at 70, 100, and 140 kV were performed. CT images for the three voltages were reconstructed on a computer for clayey soil samples with heavy-element-containing natural minerals, namely galena (PbS), witherite (BaCO 3 ), stibnite (Sb 2 S 3 ), sphalerite (ZnS), and magnetite (Fe 3 O 4 ). Quantitative analysis of the reconstructed CT images was performed to obtain the following results. (i) Galena can be distinguished from other heavy minerals (i.e. witherite, stibnite, sphalerite, and magnetite). (ii) The lead content in the clayey soil can be estimated with reasonable accuracy. These successful results demonstrate that the triple-exposure CT technique is promising for the nondestructive characterization of soil samples contaminated with hazardous heavy elements such as lead.

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Theoretical study of a simplified implementation model of a dual-energy technique for computed tomography

Cited by 9 publications

References 34 publications

Evaluation of the effectiveness of the hyperplane method in the problem of partial identification of an unknown substances

Evaluation of the effectiveness of the hyperplane method in the problem of partial identification of an unknown substances

Calculation Model of X-Ray Computed Tomography with Density Assessment Function

Use of Triple-Exposure X-ray Computed Tomography for Nondestructive Identification of Heavy Elements in Soil Samples

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