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New method to analyze resolution acquisition for intraoral scanners

Alban Desoutter Gérard Subsol Eric Fargier Alexandre Sorgius Hervé Tassery Michel Fages Frédéric Cuisinier
Metrology and Measurement Systems | 2022 | vol. 29 | No 2 | 391-404 | DOI: 10.24425/mms.2022.140032
Keywords resolution intra oral scanner mesh MicroCT
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Abstract

In dentistry, 3D intraoral scanners (IOSs) are gaining increasing popularity in the production of dental prostheses. However, the quality of an IOS in terms of resolution remains the determining factor of choice for the practitioner; a high resolution is a quality parameter that can reduce error in the production chain. To the best of our knowledge, the evaluation of IOS resolution is not clearly established in the literature. This study provides a simple assessment of resolution of an IOS by measuring a reference sample and highlights various factors that may influence the resolution. A ceramic tip was prepared to create a very thin object with an edge smaller than the current resolution stated by the company. The sample was scanned with microCT (micro-computed tomography) and an IOS. The resulting meshes were compared. In the mesh obtained with the IOS, the distance between two planes on the edge was approximately 100 micrometers, and that obtained with microtomography was 25 micrometers. The curvature values were 27.46 (standard deviation – SD) 14.71) μm -1 and 5.18 (SD 1.16) μm -1 for microCT and IOS, respectively. These results show a clear loss of information for objects that are smaller than 100 μm. As there is no normalized procedure to evaluate resolution of IOSs, the method that we have developed can provide a positive parameter for control of IOSs performance by practitioners.
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Authors and Affiliations

Alban Desoutter
1
Gérard Subsol
2
Eric Fargier
3
Alexandre Sorgius
3
Hervé Tassery
1
Michel Fages
1
Frédéric Cuisinier
1
  1. Univ. Montpellier, 163 rue Auguste Broussonnet, 34090 Montpellier, France
  2. Laboratory of Computer Science, Robotics and Microelectronics of Montpellier, 161 Rue Ada, 34095 Montpellier, France
  3. Laboratoire National de Métrologie et d’Essais, 1 Rue Gaston Boissier, 75724 Paris Cedex 15, France

Microtomography in morphological studies of small invertebrates

Teresa Nesteruk Łukasz Wiśniewski
Teka Komisji Ochrony I Kształtowania Środowiska Przyrodniczego | 2015 | Vol XII
Keywords micro-CT invertebrate X-ray morphology volumetric imaging
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Abstract

Despite great technological progress scientists still are not capable of ascertaining how many species are there on Earth. Systematic studies are not only time-consuming, but sometimes also significantly impeded by constraints of available equipment. One of the methods for morphology evaluation, which is gradually more often used for taxonomical research is microcomputed tomography. It’s great spatial resolution and ability to gather volumetric data during single acquisition without sectioning specimen are properties especially useful in evaluation of small invertebrates. Nondestructive nature of micro-CT gives possibility to combine it with other imaging techniques even for single specimen. Moreover, in case of rare organisms studies it allows to collect full structural data without fracturing their bodies. Application of proper staining, exposure parameters or specific sample preparation significantly improves quality of performed studies. The following article presents summary of current trends and possibilities of microtomography in morphology studies of small invertebrates.
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Authors and Affiliations

Teresa Nesteruk
Łukasz Wiśniewski

Evaluation of Properties of Cast Metal Foams with Irregular Inner Structure

I. Kroupová P. Lichý L. Ličev J. Hendrych K. Souček
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 4 | 1847-1851 | DOI: 10.24425/amm.2018.125114
Keywords metal foams irregular structure precursor porosity micro-CT
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Abstract

Internal structure of metal foams is one of the most important factors that determine its mechanical properties. There exists a number of methods for studying the nature of the inner porous structure. Unfortunately most of these processes is destructive and therefore it is not possible to reuse the sample. From this point of view, as a suitable method seems to be the ability of using the so-called X-ray microtomography (also micro-CT). This is a non-destructive methodology used in a number of fields (industry, science, archaeology, medicine) for a description of the material distribution in the space (e.g. pores, fillers, defects, etc.). In principle, this technology works on different absorption of X-ray radiation by materials with changing proton number. The contribution was worked out in collaboration with experts from the Faculty of Electrical Engineering and Computer Science of the VŠB-Technical University of Ostrava and it is focused on the analysis of internal structure of the metal foam casting with irregular arrangement of internal pores by using micro-CT. The obtained data were evaluated in the commercial software VGStudio MAX 2.2 and in the FOTOMNG system. For the evaluation of these data a new specialized module was introduced in this system. Several methods of pre-processing the image was prepared for the measurement. This preliminary processing consists, for example, from a binary image thresholding for better diversity between the internal porosity and the material itself or functions for colour inversion.

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Authors and Affiliations

I. Kroupová
P. Lichý
L. Ličev
J. Hendrych
K. Souček

Visual perception of the osseous labyrinth rendered from micro-CT scans of the petrous bone

Janusz Skrzat Jacek Tarasiuk Sebastian Wroński Magdalena Kozerska
Folia Medica Cracoviensia | 2017 | vol. 57 | No 4 | DOI: 10.24425/118111
Keywords visual perception image analysis inner ear micro-CT
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Authors and Affiliations

Janusz Skrzat
Jacek Tarasiuk
Sebastian Wroński
Magdalena Kozerska

A 3D model of the renal vasculature — a joined result of the corrosion casting technique, micro-CT imaging and rapid prototyping technology

Janusz Skrzat Katarzyna Heryan Jacek Tarasiuk Sebastian Wroński Klaudia Proniewska Piotr Walecki Michał Zarzecki Grzegorz Goncerz Jerzy Walocha
Folia Medica Cracoviensia | 2021 | Vol. 61 | No 4 | 45-54 | DOI: 10.24425/fmc.2021.140003
Keywords renal vasculature corrosion cast micro-CT rapid prototyping
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Abstract

Three-dimensional (3D) printed model of the renal vasculature shows a high level of accuracy of subsequent divisions of both the arterial and the venous tree. However, minor artifacts appeared in the form of oval endings to the terminal branches of the vascular tree, contrary to the anticipated sharply pointed segments. Unfortunately, selective laser sintering process does not currently permit to present the arterial, venous and urinary systems in distinct colors, hence topographic relationship between the vas-cular and the pelvicalyceal systems is difficult to attain. Nonetheless, the 3D printed model can be used for educational purposes to demonstrate the vast renal vasculature and may also serve as a reference model whilst evaluating morphological anomalies of the intrarenal vasculature in a surgical setting.
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Bibliography

1. Djonov V., Burri P.H.: Corrosion cast analysis of blood vessels. In Methods in Endothelial Cell Biology. Springer, Berlin, Heidelberg 2004; 357–369.
2. Mansur D.I., Karki S., Mehta D.K., Shrestha A., Dhungana A.: A Study on Variations of Branching Pattern of Renal Artery with its Clinical Significance. Kathmandu Univ Med J. 2019; 17 (66): 136–140. PMID: 32632062.
3. Wróbel G.: Visualization of blood vessels by corrosion technique. J Educ Health Sport. 2017; 7 (9): 283–291.
4. Rueda Esteban R.J., López McCormick J.S., Martínez Prieto D.R., Hernández Restrepo J.D.: Corrosion casting, a known technique for the study and teaching of vascular and duct structure in anatomy. Int J Morphol. 2017; 34 (3): 1147–1153. https://doi.org/10.4067/s0717-95022017000300053
5. Musiał A., Gryglewski R., Kielczewski S., Loukas M., Wajda J.: Formalin use in anatomical and histological science in the 19th and 20th centuries. Folia Med Cracov. 2016; 56 (3): 31–40. PMID: 28275269.
6. Bernhard J.C., Isotani S., Matsugasumi T., Duddalwar V., Hung A.J., Suer E., Baco E., Satkunasivam R., Djaladat H., Metcalfe C., Hu B., Wong K., Park D., Nguyen M., Hwang D., Bazargani S.T., de Castro Abreu A.L., Aron M., Ukimura O., Gill I.S.: Personalized 3D printed model of kidney and tumor anatomy: a useful tool for patient education. World J Urol. 2016; 34 (3): 337–345. doi: 10.1007/s00345-015-1632-2. PMID: 26162845.
7. Bücking T.M., Hill E.R., Robertson J.L., Maneas E., Plumb A.A., Nikitichev D.I.: From medical imaging data to 3D printed anatomical models. PLoS One. 2017; 12 (5): e0178540. doi: 10.1371/journal.pone.0178540. PMID: 28562693; PMCID: PMC5451060.
8. Marro A., Bandukwala T., Mak W.: Three-Dimensional Printing and Medical Imaging: A Review of the Methods and Applications. Curr Probl Diagn Radiol. 2016; 45 (1): 2–9. doi: 10.1067/j.cpradiol.2015.07.009. PMID: 26298798.
9. Holzem K.M., Jayarajan S., Zayed M.A.: Surgical planning with three-dimensional printing of a complex renal artery aneurysm. J Vasc Surg Cases Innov Tech. 2018; 4 (1): 19. doi: 10.1016/j.jvscit.2016.08.004. PMID: 29541692.
10. Lin J.C., Myers E.: Three-dimensional printing for preoperative planning of renal artery aneurysm surgery. J Vasc Surg. 2016; 64 (3): 810. doi: 10.1016/j.jvs.2015.12.061. PMID: 27565599.
11. Javan R., Herrin D., Tangestanipoor A.: Understanding Spatially Complex Segmental and Branch Anatomy Using 3D Printing: Liver, Lung, Prostate, Coronary Arteries, and Circle of Willis. Acad Radiol. 2016; 23 (9): 1183–1189. doi: 10.1016/j.acra.2016.04.010. PMID: 27283072.
12. McMenamin P.G., Quayle M.R., McHenry C.R., Adams J.W.: The production of anatomical teaching resources using three-dimensional (3D) printing technology. Anat Sci Educ. 2014; 7 (6): 479–486. doi: 10.1002/ase.1475. PMID: 24976019.
13. Skrzat J., Zdilla M.J., Brzegowy P., Hołda M.: 3D printed replica of the human temporal bone intended for teaching gross anatomy. Folia Med Cracov. 2019; 59 (3): 23–30. doi: 10.24425/fmc.2019.131133. PMID: 31891357.
14. Augustyn M.: Variation of the calicopelvic system of the human kidney in ontogenetic development. Folia Morphol (Warsz). 1978; 37 (2): 157–165. PMID: 308905.
15. Brödel M.: The intrinsic blood vessels of the kidney. Bull. Johns Hopkins Hosp. 1901; 12: 10–18.
16. Ajmani M.L., Ajmani K.: To study the intrarenal vascular segments of human kidney by corrosion cast technique. Anat Anz. 1983; 154 (4): 293–303. PMID: 6660543.
17. Garg A.K., Garg N., Kaushik R.K., Garg A.: A Review of Vascular Pattern of Human Kidney by Corrosion Cast Technique. Medico-Legal Update. 2012; 12 (2): 22–25.
18. Longia G.S., Kumar V., Gupta C.D.: Intrarenal arterial pattern of human kidney-corrosion cast study. Anat Anz. 1984; 155 (1–5): 183–194. PMID: 6721181.
19. Botsch M., Kobbelt L., Pauly M., Alliez P., Lévy B.: Polygon mesh processing. 2010; AK Natic Ltd, Massachusetts / CRC Press.
20. Cignoni P., Callieri M., Corsini M., Dellepiane M., Ganovelli F., Ranzuglia G.: Meshlab: an open- source mesh processing tool. In Eurographics Italian chapter conference. 2008; 29–136.
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Authors and Affiliations

Janusz Skrzat
1
Katarzyna Heryan
2
Jacek Tarasiuk
3
Sebastian Wroński
3
Klaudia Proniewska
4
Piotr Walecki
4
Michał Zarzecki
1
Grzegorz Goncerz
1
Jerzy Walocha
1
  1. Jagiellonian University Medical College, Department of Anatomy, Kraków, Poland
  2. AGH University of Science and Technology, Department of Measurement and Electronics, Kraków, Poland
  3. AGH University of Science and Technology, Department of Condensed Matter Physics, Kraków, Poland
  4. Jagiellonian University Medical College, Department of Bioinformatics and Telemedicine, Kraków, Poland

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