scholarly journals Deterministic and Probabilistic Tractography Based on Complex Fibre Orientation Distributions

2009 ◽  
Vol 28 (2) ◽  
pp. 269-286 ◽  
Author(s):  
M. Descoteaux ◽  
R. Deriche ◽  
T.R. Knosche ◽  
A. Anwander
Author(s):  
Gabriel Stadler ◽  
Andreas Primetzhofer ◽  
Gerald Pinter ◽  
Florian Grün

To exploit the full material potential of short fibre reinforced PA6T/6I, specific component calculations including aniso- tropic material behaviour is necessary. For this, different failure criteria and fatigue models are used to describe the behaviour during a component service life. This paper deals with the determination and consideration of fibre orientations for failure criteria and fatigue calculations. Therefore, a novel method to determine fibre orientation (FO) distributions across injection moulded plates, is proposed. The developed method allows a forecast of FOs for different specimen extraction positions and angles on injection moulded plates by using only a few measured reference points. As a result, fatigue models can be calibrated with the strength values and the corresponding FO, calculated for fracture position. The performed tests show a non-negligible influence of failure positions, due to fibre orientation distributions along the specimens. So, the FO determination method delivers an improvement in strength values estimation.


2020 ◽  
Vol 152 ◽  
pp. 112548 ◽  
Author(s):  
Victor Gager ◽  
David Legland ◽  
Alain Bourmaud ◽  
Antoine Le Duigou ◽  
Floran Pierre ◽  
...  

NeuroImage ◽  
2011 ◽  
Vol 56 (3) ◽  
pp. 1171-1180 ◽  
Author(s):  
David Raffelt ◽  
J-Donald Tournier ◽  
Jurgen Fripp ◽  
Stuart Crozier ◽  
Alan Connelly ◽  
...  

2020 ◽  
Vol 17 (169) ◽  
pp. 20200371
Author(s):  
Jeremy D. Eekhoff ◽  
Spencer P. Lake

Fibre topography of the extracellular matrix governs local mechanical properties and cellular behaviour including migration and gene expression. While quantifying properties of the fibrous network provides valuable data that could be used across a breadth of biomedical disciplines, most available techniques are limited to two dimensions and, therefore, do not fully capture the architecture of three-dimensional (3D) tissue. The currently available 3D techniques have limited accuracy and applicability and many are restricted to a specific imaging modality. To address this need, we developed a novel fibre analysis algorithm capable of determining fibre orientation, fibre diameter and fibre branching on a voxel-wise basis in image stacks with distinct fibre populations. The accuracy of the technique is demonstrated on computer-generated phantom image stacks spanning a range of features and complexities, as well as on two-photon microscopy image stacks of elastic fibres in bovine tendon and dermis. Additionally, we propose a measure of axial spherical variance which can be used to define the degree of fibre alignment in a distribution of 3D orientations. This method provides a useful tool to quantify orientation distributions and variance on image stacks with distinguishable fibres or fibre-like structures.


NeuroImage ◽  
2017 ◽  
Vol 158 ◽  
pp. 205-218 ◽  
Author(s):  
Matteo Bastiani ◽  
Michiel Cottaar ◽  
Krikor Dikranian ◽  
Aurobrata Ghosh ◽  
Hui Zhang ◽  
...  

2014 ◽  
Vol 5 (2) ◽  
pp. 119-125
Author(s):  
I. Kovács

The present paper of a series deals with the experimental characterisation of flexural toughness properties of structural concrete containing different volume of hooked-end steel fibre reinforcement (75 kg/m3, 150 kg/m3). Third-point flexural tests were carried out on steel fibre reinforced concrete beams having a cross-section of 80 mm × 85 mm with the span of 765 mm, hence the shear span to depth ratio was 3. Beams were sawn out of steel fibre reinforced slab elements (see Part I) in order to take into consideration the introduced privilege fibre orientation (I and II) and the position of the beam (Ba-a, Ba-b, Ba-c) before sawing (see Part I). Flexural toughness properties were determined considering different standard specifications, namely the method of the ASTM (American Standards for Testing Materials), the process of the JSCE (Japan Society of Civil Engineering), and the final proposal of Banthia and Trottier for the post cracking strength. Consequently, behaviour of steel fibre reinforced concrete was examined in bending taking into consideration different experimental parameters such as fibre content, concrete mix proportions, fibre orientation, positions of test specimens in the formwork, while experimental constants were the size of specimens, the type of fibre used and the test set-up and test arrangement.


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