Ray-casting method to assess the quality of segmented surfaces from 3D images

2017 ◽  
Author(s):  
J. P. D'Amato ◽  
M. Del Fresno ◽  
C. Garcia Bauza ◽  
M. Vénere
Keyword(s):  
Ray Casting ◽  
Casting Method ◽  
3D Images

scholarly journals ON THE ROLE OF HISTOMORPHOMETRIC (STEREOLOGICAL) MICROSTRUCTURE PARAMETERS IN THE PREDICTION OF VERTEBRAE COMPRESSION STRENGTH

2019 ◽  
Vol 38 (1) ◽  
pp. 63 ◽  
Author(s):  
Leszek Karol Wojnar ◽  
Aneta Gądek-Moszczak ◽  
Jacek Pietraszek
Keyword(s):  
Compression Strength ◽  
Correlation Coefficients ◽  
Diagnostic Techniques ◽  
Micro Ct ◽  
Compression Tests ◽  
Mineral Density ◽  
3D Images ◽  
Microstructure Parameters

The well-documented relation between bone mineral density (BMD) and bone compression strength constitutes the basis for osteoporosis diagnostics and the assessment of fracture risk. Simultaneously, this relation demonstrates a considerable scatter of results as bones of identical mineral density may have significantly different properties. The experimentally confirmed theorem that two materials or tissues of identical microstructure have identical properties leads to the evaluation of various quantitative stereological parameters (also referred to in biomedicine as histomorphology). These parameters, obtained from analysis of 2D or 3D images, have been used in numerous attempts to explain changes in bone strength. Although numerous correlation dependencies, often with high correlation coefficients, were evaluated, we do not know which parameters are worth evaluating, and there is no physical interpretation of these relations. An extended statistical analysis was accomplished on the basis of analysis of 3D images from 23 lumbar (L3) vertebrae scanned with micro-CT and the results of subsequent compression tests. A new parameter called SDF (structure destruction factor) was proposed in order to characterise the quality of 3D trabecular structures, and its significance was demonstrated. The final correlation function, which uses only three stereological parameters, made it possible to predict compression strength with considerable precision. The estimated values correlated very well with the apparent values (correlation coefficient r=0.96). Finally, the stereological parameters most suitable for characterisation of bone compression strength were chosen and a mechanism responsible for the changes in mechanical properties was proposed. The results obtained defined the necessary improvements in diagnostic techniques that would allow for more efficient quantitative microstructure evaluation and guidelines on how to improve treatment of patients with weakened bones.

Effect of Different Gating Systems and Sand Mold Binder on the Cast-Quality of Bicycle Frame Produced through Sand Casting Method

2020 ◽  
Vol 402 ◽  
pp. 100-107
Author(s):  
Akhyar ◽  
Husaini ◽  
Masri Ali ◽  
Nurdin Ali ◽  
Farhan Ahmad
Keyword(s):  
Water Glass ◽  
Casting Process ◽  
Sand Mold ◽  
Casting Defects ◽  
Casting Method ◽  
Mold Casting ◽  
Furan Resin ◽  
Bicycle Frame ◽  
The Impact

The bicycle frame produced through the metal casting process by recycling aluminum alloys can be an environmentally friendly alternative solution. Mold types and gating systems used generally affects the quality of the casting product. In this experiment, the effect of gating number and riser type variations (for sand binder) observed on casting defects, hardness, and impact value. Subsequently, chemical composition and microstructure of recycled aluminum metal from bicycle frames produced through sand mold casting are also evaluated. Three types of risers are bentonite, water glass, and furan resin. The results indicate that mold with two gating system has a low porosity as casting defects. The cast-bike frame produced using furan resin reaches the highest hardness value of 46 HRB compared to water glass and bentonite as the binder of sand-molds. The impact test observes 3.9 J carried out by the ASTM E23 sample at room temperature.

A Method for Achieving the Maximum Quality of 3D Images

2019 ◽  
Author(s):  
Evgeniya I. Tumanova ◽  
Gleb G. Rogozinsky ◽  
Dmitry A. Tatarenkov ◽  
Marpha A. Dalk
Keyword(s):  
3D Images

scholarly journals Fabrication of U-10 wt.%Zr Metallic Fuel Rodlets for Irradiation Test in BOR-60 Fast Reactor

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Ki-Hwan Kim ◽  
Jong-Hwan Kim ◽  
Seok-Jin Oh ◽  
Jung-Won Lee ◽  
Ho-Jin Lee ◽  
...  
Keyword(s):  
Fast Reactor ◽  
Casting Defects ◽  
Qualification Test ◽  
Fabrication Technology ◽  
Metallic Fuel ◽  
Casting Method ◽  
Casting Technology ◽  
Irradiation Test ◽  
Injection Casting

The fabrication technology for metallic fuel has been developed to produce the driver fuel in a PGSFR in Korea since 2007. In order to evaluate the irradiation integrity and validate the in-reactor of the starting metallic fuel with FMS cladding for the loading of the metallic fuel, U-10 wt.%Zr fuel rodlets were fabricated and evaluated for a verification of the starting driver fuel through an irradiation test in the BOR-60 fast reactor. The injection casting method was applied to U-10 wt.%Zr fuel slugs with a diameter of 5.5 mm. Consequently, fuel slugs per melting batch without casting defects were fabricated through the development of advanced casting technology and evaluation tests. The optimal GTAW welding conditions were also established through a number of experiments. In addition, a qualification test was carried out to prove the weld quality of the end plug welding of the metallic fuel rodlets. The wire wrapping of metallic fuel rodlets was successfully accomplished for the irradiation test. Thus, PGSFR fuel rodlets have been soundly fabricated for the irradiation test in a BOR-60 fast reactor.

Automated Weld Integrity Analysis Using 3D Point Data

2010 ◽  
Author(s):  
Matthew Swanson ◽  
Eric Johnson ◽  
Alexander Stoytchev
Keyword(s):  
Camera System ◽  
Inspection Method ◽  
Control Applications ◽  
3D Images ◽  
Weld Toe ◽  
Point Data ◽  
Integrity Analysis ◽  
Manufacturing Environments ◽  
Non Destructive

This paper describes a method for non-destructive evaluation of the quality of welds from 3D point data. The method uses a stereo camera system to capture high-resolution 3D images of deposited welds, which are then processed in order to extract key parameters of the welds. These parameters (the weld angle and the radius of the weld at the weld toe) can in turn be used to estimate the stress concentration factor of the weld and thus to infer its quality. The method is intended for quality control applications in manufacturing environments and aims to supplement, and even eliminate, the manual inspections which are currently the predominant inspection method. Experimental results for T-fillet welds are reported.

Filtering Algorithms for 3D Range Image Analysis

2013 ◽  
Vol 199 ◽  
pp. 235-240 ◽  
Author(s):  
Andrzej Sioma
Keyword(s):  
Image Analysis ◽  
Vision System ◽  
Three Dimensional ◽  
Range Image ◽  
Construction Technique ◽  
3D Images ◽  
Image Construction ◽  
Dimensional Image ◽  
Three Dimensional Vision

This article is devoted to the methods of image analysis used in three-dimensional vision systems. Based on a sample set of 3D images, their defects resulting from the adopted three-dimensional image construction technique are discussed. Those defects are discussed in relation to the following parameters: speed of the vision system, power of the laser, laser mode, laser arrangement relative to the vision system sensor and relative to the tested surface. To illustrate the cases discussed, images showing the effects of selected parameters on the quality of mapping of the tested object onto a three-dimensional image were presented. The next part of the article discusses methods of range image filtering that removes or reduces the importance of defects of the adopted method in any control and measuring tasks. Particular attention is given to methods of removing data described as missing data.

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