Bio-CAD Reverse Engineering of Free-form Surfaces by Planar Contours

Ameddah, Hacene; Assas, Mekki

doi:10.3722/cadaps.2011.37-42

Cited by 8 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…N u parametric functions used to blend the influence of 1 n  control points CP i P in Eq. (1) are defined by the well known Cox-de Boor recursive formula:…”

Section: Planar and Closed B-spline Fitting By Control Polygon Deform...mentioning

confidence: 99%

Stress Analysis of Second Molar Tooth

Singh¹,

Kohli²

2013

Computer-Aided Design and Applications

View full text Add to dashboard Cite

Accurate determination of the flexion-extension axis of the elbow affects the outcome of implant replacement. The current study proposes an automated approach capable of determining the FE axis based on a stack of axial computer tomographic (CT) imaging slices of the distal humerus. The core of the algorithm consists of an original technique employing control polygon deformation used to approximate the segmented outer cortical bone points with closed B-Splines, followed by curvaturebased and least squares fitting methods for determination of the two relevant geometric centers. The new approach was validated against a conventional voxelbased FE axis determination procedure involving marching cubes algorithm.

show abstract

“…N u parametric functions used to blend the influence of 1 n  control points CP i P in Eq. (1) are defined by the well known Cox-de Boor recursive formula:…”

Section: Planar and Closed B-spline Fitting By Control Polygon Deform...mentioning

confidence: 99%

Stress Analysis of Second Molar Tooth

Singh¹,

Kohli²

2013

Computer-Aided Design and Applications

View full text Add to dashboard Cite

show abstract

“…In most studies, parametric models were generated through specialized reverse engineering operations performed on data acquired via CT or MRI scans. Very often, the reconstruction of the human anatomical features comes down to approximation of the planar segmented point datasets with parametric curves determined by means of custom-written routines [3,14] or commercial CAD software [1].…”

Section: Introductionmentioning

confidence: 99%

Embedded CFD Simulation for Blood Flow

Bartesaghi

Colombo

2013

Computer-Aided Design and Applications

View full text Add to dashboard Cite

The aim of the study is the analysis of strategies and parameters to automate CFD simulations. The idea is to perform an Embedded CFD simulation for product development and verification. This work focuses on biomedical problems, in particular on vessel bifurcations with aneurysm located in the circulatory system. The research is\ud conducted by the analysis of the pre-processing, solving and post-processing steps, in order to find a methodology that involves the reliable calculation of the CFD variables. For the pre-processing step, spatial grids study is conducted to find the element density that allows efficient calculations. The evaluations are done on a blood flow\ud through an ideal artery bifurcation aneurysm. Subsequently the time step entity and the maximum inner iteration number are studied to calculate the independent variables. The time step is evaluated on the ideal bifurcation aneurysm with a constant inlet flow velocity, while the maximum inner iteration value is evaluated on the ideal\ud bifurcation with a time dependent inlet flow velocity. The last study of the preprocessing is conducted on a reconstruction of real artery bifurcation aneurysm, modified with the extrusion of the inlet region, that allow the complete velocity field to develop. For each one, the original and the modified models, it’s generated an unsteady simulation with set up in agreement with previous steps. A correct postprocess management study done through the pulsatile non-stationary simulation. The solution data will be used for the post-processing evaluations. So pressure and velocity evaluation layouts will be identified; Wall Shear Stress (WSS) based indices evaluation layouts will be implemented in order to enable a better evaluation of the case: Time Averaged Wall Shear Stress, Oscillatory Shear Index, Relative Residence Time. Lastly it will be considered a layout about Q-Criterion evaluation. The procedures defined during the study enable a partial automation of the CFD simulations. Acquiring an arterial bifurcation aneurysm model is possible to proceed\ud to the automatic spatial grids generation; the numeric model is used to resolve unsteady flow, set with optimal parameters. Finally it is possible to evaluate the calculated variables by means of appropriate diagrams generation

show abstract