The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A good knowledge of the cardiac microarchitecture is essential for better understanding the function of the human heart. This paper investigates the transmural 3D microstructure of the left ventricle of the human heart. An ex-vivo sample (7 × 7 × 15 mm3) extracted from the anterior wall of the myocardium is imaged using X-rays phase contrast micro-tomography. Sampling the volume at high isotropic...
Cardiac myofibre deformation is an important determinant of the mechanical function of the heart. Quantification of myofibre strain relies on 3D measurements of ventricular wall motion interpreted with respect to the tissue microstructure. In this study, we estimated in vivo myofibre strain using 3D structural and functional atlases of the human heart. A finite element modelling framework was developed...
In-vivo three-dimensional (3D) DTI acquisition of an entire human heart for a complete cardiac cycle is currently technically impossible. We propose an alternative to this problem by simulating DTI of dynamic cardiac fiber structures. We first model a virtual dynamic cardiac fiber structure by integrating cardiac motion information into an ex vivo referential cardiac fiber structure and then use a...
Fiber tracking in diffusion tensor magnetic resonance imaging (DT-MRI, or DTI) offers a unique and nondestructive technique to obtain the three-dimensional organization of myocardial fibers. This technique is however sensitive to various parameters. In this paper, we present a methodology to get insight into how fiber tracking results vary with different parameters such as anisotropy threshold. The...
We propose a new fibre tracking algorithm for cardiac DT-MRI that parts with the locally ??greedy?? paradigm intrinsic to conventional tracking algorithms. We formulate the fibre tracking problem as the global problem of computing paths in a Boolean-weighted undirected graph. Each voxel is a vertex and edges connect every pair of neighboring voxels. We solve the underlying optimization task by Metropolis...
Cardiac myofibrilles bundles in the human heart can be located by iteratively tracing the local water diffusion direction inferred from diffusion weighted MRI images. This well known process, called streamlining, needs to be initialized by a seed. In this paper, a global, graph modeling approach for cardiac myofibrille tractography is presented. Seed points are no longer needed : it predicts the fibers...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.