An efficient approach to converting three-dimensional image data into highly accurate computational models

Young, Paul A.; Beresford-West, T.; Coward, Sam; Notarberardino, Bruno; Walker, B. S.; Abdul-Aziz, Ali

doi:10.1098/rsta.2008.0090

Cited by 189 publications

(127 citation statements)

References 33 publications

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“…6 The assignment of inhomogeneous material properties to the FE mesh relied on algorithms patented by Simpleware. 7 The Omega3 Compression Hip Screw, a typical sliding hip screw currently manufactured by Stryker Osteosynthesis (Schoenkirchen, Germany), was used to stabilize our trochanteric fracture model. It was considered to be made of stainless steel characterized by a Young's modulus of 195 GPa and a Poisson's ratio of 0.3.…”

Section: Methodsmentioning

confidence: 99%

The importance of lag screw position for the stabilization of trochanteric fractures with a sliding hip screw: A subject‐specific finite element study

Goffin

Pankaj

Simpson

2012

Journal Orthopaedic Research

110

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Using finite element analysis, we compared the biomechanical performance of a CT scan-based three-part trochanteric fracture model (31-A2 in the AO classification) stabilized with a sliding hip screw for nine different positions of the lag screw (3 Â 3 arrangement, from anterior to posterior and from inferior to superior). Our results showed that the volume of bone susceptible to yielding in the head and neck region is the lowest for inferior positions and increases as the lag screw is moved superiorly. Overall, for this specific subject, the models less likely to lead to cut-out are the ones corresponding to inferior middle and inferior posterior positions of the lag screw. In our study, the tip-apex distance (TAD) was anti-correlated with the risk of cut-out, as quantified by the volume of bone susceptible to yielding, which suggests that a TAD >25 mm cannot be considered to be an accurate predictor of lag screw cut-out. Further clinical studies investigating lag screw cut-out should attempt to find more reliable predictors of cut-out that should better reflect the biomechanics and subject-specificity of the femoral head. ß

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Section: Methodsmentioning

confidence: 99%

The importance of lag screw position for the stabilization of trochanteric fractures with a sliding hip screw: A subject‐specific finite element study

Goffin

Pankaj

Simpson

2012

Journal Orthopaedic Research

110

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“…This also affects voxels which include an interface between structures, giving these voxels an intermediate grey value. This can be beneficial for visualisation and conversion to computer models for monomaterials (Young et al, 2008), but it is generally an imaging arefact reducing the accuracy of the data analysis (Ketcham and Carlson, 2001). More specifically this effect may result in a large error when analysing small structures and pores with a large ratio of surface to volume (Kerckhofs et al, 2008).…”

Section: Discretization Effectsmentioning

confidence: 99%

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

Cnudde

Boone

2013

Earth-Science Reviews

1,232

700

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Please cite this article as: Cnudde, V., Boone, M.N., "High-resolution X-ray computed tomography in geosciences: a review of the current technology and applications", Earth Science Reviews (2013Reviews ( ), doi: 10.1016Reviews ( /j.earscirev.2013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T AbstractHigh-resolution X-ray Computed Tomography (HRXCT) or micro-CT (µCT) is a frequently used non-destructive 3D imaging and analysis technique for the investigation of internal structures of a large variety of objects, including geomaterials. Although the possibilities of X-ray micro-CT are becoming better appreciated in earth science research, the demands on this technique are also approaching certain physical limitations. As such, there remains a lot of research to be done in order to solve all the technical problems that occur when higher demands are put on the technique. In this paper, a review of the principle, the advantages and limitations of X-ray CT itself are presented, together with an overview of some current applications of micro-CT in geosciences. One of the main advantages of this technique is the fact that it is a non-destructive characterization technique which allows 4D monitoring of internal structural changes at resolutions down to a few hundred nanometers. Limitations of this technique are the operator dependency for the 3D image analysis from the reconstructed data, the discretations effects and possible imaging artefacts. Driven by the technological and computational progress, the technique is continuously growing as an analysis tool in geosciences and is becoming one of the standard techniques, as is shown by the large and still increasing number of publications in this research area. It is foreseen that this number will continue to rise, and micro-CT will become an indispensable technique in the field of geosciences.

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“…The FE discretisation of the foam sample was carried out by using ScanIP (Simpleware Ltd, UK), which is a commercial software for directly converting CT images into high quality 3D meshes [15]. The 3D profile of the foam sample after meshing is shown in Fig.…”

Section: Geometrical Characterisation and Meshingmentioning

confidence: 99%

Strain-rate sensitivity of foam materials: A numerical study using 3D image-based finite element model

Sun

Withers

2015

EPJ Web of Conferences

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Abstract. Realistic simulations are increasingly demanded to clarify the dynamic behaviour of foam materials, because, on one hand, the significant variability (e.g. 20% scatter band) of foam properties and the lack of reliable dynamic test methods for foams bring particular difficulty to accurately evaluate the strain-rate sensitivity in experiments; while on the other hand numerical models based on idealised cell structures (e.g. Kelvin and Voronoi) may not be sufficiently representative to capture the actual structural effect. To overcome these limitations, the strain-rate sensitivity of the compressive and tensile properties of closed-cell aluminium Alporas foam is investigated in this study by means of meso-scale realistic finite element (FE) simulations. The FE modelling method based on X-ray computed tomography (CT) image is introduced first, as well as its applications to foam materials. Then the compression and tension of Alporas foam at a wide variety of applied nominal strain-rates are simulated using FE model constructed from the actual cell geometry obtained from the CT image. The stain-rate sensitivity of compressive strength (collapse stress) and tensile strength (0.2% offset yield point) are evaluated when considering different cell-wall material properties. The numerical results show that the rate dependence of cell-wall material is the main cause of the strain-rate hardening of the compressive and tensile strengths at low and intermediate strain-rates. When the strain-rate is sufficiently high, shock compression is initiated, which significantly enhances the stress at the loading end and has complicated effect on the stress at the supporting end. The plastic tensile wave effect is evident at high strain-rates, but shock tension cannot develop in Alporas foam due to the softening associated with single fracture process zone occurring in tensile response. In all cases the micro inertia of individual cell walls subjected to localised deformation is found to have negligible effect on the macro strain-rate sensitivity of Alporas foam.

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An efficient approach to converting three-dimensional image data into highly accurate computational models

Cited by 189 publications

References 33 publications

The importance of lag screw position for the stabilization of trochanteric fractures with a sliding hip screw: A subject‐specific finite element study

The importance of lag screw position for the stabilization of trochanteric fractures with a sliding hip screw: A subject‐specific finite element study

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

Strain-rate sensitivity of foam materials: A numerical study using 3D image-based finite element model

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