Synchrotron and Neutron Tomography of Paleontological Objects on the Facilities of the Kurchatov Institute

Pakhnevich, A. V.; Kurkin, Andrey; Лавров, А. В.; Тарасенко, К. К.; Kovalenko, E. S.; Kaloyan, A. A.; Подурец, К. М.

doi:10.3390/jimaging4080103

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Taking into account the advantage of the nondestructive research method, in recent years a large number of experiments in biology [4][5][6][7], geophysics [8][9][10], engineering [11][12][13], paleontology [14][15][16][17], archeology [18][19][20][21][22], etc. In [23,24], the possibilities of neutron radiography and tomography for visualizing the presence of organic substances inside metals are presented.…”

Section: Introductionmentioning

confidence: 99%

Studies of the internal structure of electrical devices and the archaeological heritage by the method of neutron radiography and tomography

Tashmetov

Yuldashev

Adizov

et al. 2021

УФЖ

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The paper presents the results of the study of a series of objects of electrical devices and archaeological heritage by the method of neutron radiography and tomography (VL-10 diode, spark plug, bell, ancient ring, stone). It is shown that the method of neutron radiography and tomography reliably works on samples made of various materials. Neutron radiographic and tomographic studies of the VL-10 diode gave an idea of the internal structure of the diode. Experiments with spark plugs have revealed the causes of its faulty function. According to the tomographic results of the bell, ring and stone, the heterogeneous areas in the internal volume of these objects were revealed. The results obtained are the basis for further research in the field of archaeological heritage and technical devices for special purposes.

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Section: Introductionmentioning

confidence: 99%

Studies of the internal structure of electrical devices and the archaeological heritage by the method of neutron radiography and tomography

Tashmetov

Yuldashev

Adizov

et al. 2021

УФЖ

View full text Add to dashboard Cite

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“…Analysis of a three-dimensional internal structure of objects is required for the study of multimaterial components [5], for characterization of object's properties [6], or to analyze nanostructures [7], [8]. More problem-specific applications include archaeology, where computed tomography is used for the analysis of precious artifacts [9], or to read historical manuscripts which could not be manually handled [10]. Increased international trade requires automatization of cargo inspection, which could be performed using tomographic analysis [11], and there are studies of CT application for airport luggage inspection systems [12].…”

Section: Introduction a Computed Tomography And Its Applicationsmentioning

confidence: 99%

Monitored Reconstruction: Computed Tomography as an Anytime Algorithm

et al. 2020

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Computed tomography is an important technique for non-destructive analysis of an object's internal structure, relevant for scientific studies, medical applications, and industry. Pressing challenges emerging in the field of tomographic imaging include speeding up reconstruction, reducing the time required to obtain the X-ray projections, and reducing the radiation dose imparted to the object. In this paper, we introduce a model of a monitored reconstruction process, in which the acquiring of projections is interspersed with image reconstruction. This model allows to examine the tomographic reconstruction process as an anytime algorithm and consider a problem of finding the optimal stopping point, corresponding to the required number of X-ray projections for the currently scanned object. We outline the theoretical framework for the monitored reconstruction, propose ways of constructing stopping rules for various reconstruction quality metrics and provide their experimental evaluation. Due to stopping at different times for different objects, the proposed approach allows to achieve a higher mean reconstruction quality for a given mean number of X-ray projections. Conversely, fewer projections on average are used to achieve the same mean reconstruction quality. INDEX TERMS Anytime algorithms, computed tomography, dose reduction, monitored reconstruction, optimal stopping, x-ray tomography.

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“…With its increasing accessibility, high-resolution 3D imaging—such as CT scanning—has become a useful, non-destructive tool for the study of small, complex, and delicate internal structures like the loop and cardinalia (e.g. [65–72]). CT, in particular, ensures that shell characters crucial for identification of genera and species of articulate brachiopods (e.g.…”

Section: Introductionmentioning

confidence: 99%

Testing Species Assignments in Extant Terebratulide Brachiopods: A Three-dimensional Geometric Morphometric Analysis of Long-Looped Brachidia

Carranza

Carlson

2019

PLoS ONE

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Species of terebratulide brachiopods have been largely characterized qualitatively on the basis of morphology. Furthermore, species-level morphological variability has rarely been analyzed within a quantitative framework. The objective of our research is to quantify morphological variation to test the validity of extant named species of terebratulide brachiopods, focusing on the lophophore-supporting structures—the “long loops.” Long loops are the most distinctive and complex morphological feature in terebratellidine brachiopods and are considered to be phylogenetically and taxonomically informative. We studied eight species with problematic species identities in three genera distributed in the North Pacific: Laqueus, Terebratalia, and Dallinella. Given how geometrically complex long loops are, we generated 3D models from computed tomography (CT) scans of specimens of these eight species and analyzed them using 3D geometric morphometrics. Our goal was to determine ranges of variation and to test whether species are clearly distinguishable from one another in morphospace and statistically. Previous studies have suggested that some species might be overly split and are indistinguishable. Our results show that these extant species of terebratellidines can be reliably distinguished on the basis of quantitative loop morphometrics. Using 3D geometric morphometric methods, we demonstrate the utility of CT beyond purely descriptive imaging purposes in testing the morphometric validity of named species. It is crucial to treat species described and named from qualitative morphology as working hypotheses to be tested; many macroevolutionary studies depend upon the accurate assessment of species in order to identify and seek to explain macroevolutionary patterns. Our results provide quantitative documentation of the distinction of these species and thus engender greater confidence in their use to characterize macroevolutionary patterns among extant terebratellidine brachiopods. These methods, however, require further testing in extinct terebratellidines, which only rarely preserve the delicate long loop in three dimensions. In addition, molecular analyses of extant terebratellidines will test the species delimitations supported by the morphometric analyses presented in this study. [Species determination; morphological variability; 3D geometric morphometrics; terebratulide brachiopods; long loops.]

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Synchrotron and Neutron Tomography of Paleontological Objects on the Facilities of the Kurchatov Institute

Cited by 5 publications

References 9 publications

Studies of the internal structure of electrical devices and the archaeological heritage by the method of neutron radiography and tomography

Studies of the internal structure of electrical devices and the archaeological heritage by the method of neutron radiography and tomography

Monitored Reconstruction: Computed Tomography as an Anytime Algorithm

Testing Species Assignments in Extant Terebratulide Brachiopods: A Three-dimensional Geometric Morphometric Analysis of Long-Looped Brachidia

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