An alternative method of three-dimensional reconstruction from two-dimensional CT and MR data sets

Wrazidlo, W; Brambs, H.-J.; Lederer, Wolfgang; Schneider, S.; Geiger, Bernhard; Fischer, Ch.‐H.

doi:10.1016/0720-048x(91)90125-f

Cited by 22 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For visualization of the coronary tree, the user interactively specifies a curved subvolume (enclosed in the 3D coronary data set) that closely encompasses the coronary artery segments. Three-dimensional Delaunay triangulation [18] and parallel projection enable the simultaneous display of multiple coronary segments in one 2D representation. To calculate vessel diameters and sharpness, the user must define the segment of interest by marking multiple points on the course of the vessel.…”

Section: Quantitative Analysis Of Mr Imagesmentioning

confidence: 99%

Coronary MR Angiography: Comparison of Quantitative and Qualitative Data from Four Techniques

Maintz

Aepfelbacher

Kissinger

et al. 2004

American Journal of Roentgenology

View full text Add to dashboard Cite

show abstract

Section: Quantitative Analysis Of Mr Imagesmentioning

confidence: 99%

Coronary MR Angiography: Comparison of Quantitative and Qualitative Data from Four Techniques

Maintz

Aepfelbacher

Kissinger

et al. 2004

American Journal of Roentgenology

View full text Add to dashboard Cite

show abstract

“…Linear tetrahedral (TET4) elements are often used due to the ease and robustness of performing automatic meshing, and local and adaptive refinement with tetrahedral elements (Hubsch et al, 1995; Johnson and MacLeod, 1998; Prakash and Ethier, 2001; Spilker et al, 1992) (Delaunay, 1934; Lo, 1991a, b; Lohner, 1996; McErlain et al, 2011; Shephard and Georges, 1991; Wrazidlo et al, 1991). There are several examples in the recent literature that have used TET4 elements to discretize articular cartilage (Das Neves Borges et al, 2014; Johnson et al, 2014; McErlain et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation of articular contact mechanics with quadratic tetrahedral elements

Maas

Ellis

Rawlins

et al. 2016

Journal of Biomechanics

View full text Add to dashboard Cite

Although it is easier to generate finite element discretizations with tetrahedral elements, trilinear hexahedral (HEX8) elements are more often used in simulations of articular contact mechanics. This is due to numerical shortcomings of linear tetrahedral (TET4) elements, limited availability of quadratic tetrahedron elements in combination with effective contact algorithms, and the perceived increased computational expense of quadratic finite elements. In this study we implemented both ten-node (TET10) and fifteen-node (TET15) quadratic tetrahedral elements in FEBio (www.febio.org) and compared their accuracy, robustness in terms of convergence behavior and computational cost for simulations relevant to articular contact mechanics. Suitable volume integration and surface integration rules were determined by comparing the results of several benchmark contact problems. The results demonstrated that the surface integration rule used to evaluate the contact integrals for quadratic elements affected both convergence behavior and accuracy of predicted stresses. The computational expense and robustness of both quadratic tetrahedral formulations compared favorably to the HEX8 models. Of note, the TET15 element demonstrated superior convergence behavior and lower computational cost than both the TET10 and HEX8 elements for meshes with similar numbers of degrees of freedom in the contact problems that we examined. Finally, the excellent accuracy and relative efficiency of these quadratic tetrahedral elements was illustrated by comparing their predictions with those for a HEX8 mesh for simulation of articular contact in a fully validated model of the hip. These results demonstrate that TET10 and TET15 elements provide viable alternatives to HEX8 elements for simulation of articular contact mechanics.

show abstract

“…[18] The borderzone (BZ)/ MI interface was identified on cine MRI images. The BZ was defined as extending 1 cm from the infarct edge.…”

Section: Methodsmentioning

confidence: 99%

Moderate Ischemic Mitral Regurgitation After Posterolateral Myocardial Infarction in Sheep Alters Left Ventricular Shear but Not Normal Strain in the Infarct and Infarct Borderzone

Soleimani

et al. 2016

The Annals of Thoracic Surgery

View full text Add to dashboard Cite

Background Chronic ischemic mitral regurgitation (CIMR: MR) is associated with poor outcome. Left ventricular (LV) strain after postero-lateral myocardial infarction (MI) may drive LV remodeling. Although moderate CIMR has been previously shown to effect LV remodeling, the effect of CIMR on LV strain after postero-lateral MI remains unknown. We tested the hypothesis that moderate CIMR alters LV strain after postero-lateral MI. Methods/Results Postero-lateral MI was created in 10 sheep. Cardiac MRI with tags was performed 2 weeks before and 2, 8 and 16 weeks after MI. LV and right ventricular (RV) volumes were measured and regurgitant volume indexed to body surface area (BSA; RegurgVolume Index) calculated as the difference between LV and RV stroke volumes / BSA. Three-dimensional strain was calculated. Circumferential (Ecc)and longitudinal (Ell) strains were reduced in the infarct proper, MI borderzone (BZ) and remote myocardium 16 weeks after MI. In addition, radial circumferential (Erc) and radial longitudinal (Erl) shear strains were reduced in remote myocardium but increased in the infarct and BZ 16 weeks after MI. Of all strain components, however, only Erc was effected by RegurgVolume Index (p=0.0005). There was no statistically significant effect of RegurgVolume Index on Ecc, Ell, Erl, or circumferential longitudinal shear strain (Ecl). Conclusions Moderate CIMR alters radial circumferential shear strain after postero-lateral MI in the sheep. Further studies are needed to determine the effect of shear strain on myocyte hypertrophy and the effect of mitral repair on myocardial strain.

show abstract

An alternative method of three-dimensional reconstruction from two-dimensional CT and MR data sets

Cited by 22 publications

References 17 publications

Coronary MR Angiography: Comparison of Quantitative and Qualitative Data from Four Techniques

Coronary MR Angiography: Comparison of Quantitative and Qualitative Data from Four Techniques

Finite element simulation of articular contact mechanics with quadratic tetrahedral elements

Moderate Ischemic Mitral Regurgitation After Posterolateral Myocardial Infarction in Sheep Alters Left Ventricular Shear but Not Normal Strain in the Infarct and Infarct Borderzone

Contact Info

Product

Resources

About