Deterministic tractography
In neuroscience, tractography is a 3D modeling technique used to visually represent nerve tracts using data collected by diffusion MRI. It uses special techniques of magnetic resonance imaging (MRI) and computer-based diffusion MRI. The results are presented in two- and three-dimensional images called tractograms. In addition to the long tracts that connect the brain to the rest of the body, there are complicated n… WebDeterministic tractography methods are primarily based upon streamline algorithms where the local tract direction is defined by the major eigenvector of the diffusion tensor. These approaches have been used to map out white matter anatomical connections in the human brain.
Deterministic tractography
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WebJan 1, 2011 · Algorithms that construct a 3D view of the white matter connection pathways are sometimes referred to as “deterministic tractography.” Rather than giving direct visualization of the fiber bundles, probabilistic tractography informs the users about the estimated probability distribution of how likely 2 or more certain regions are ... WebMany different tractography approaches and corresponding isolated evaluation attempts have been presented over the last years, but a comparative and quantitative evaluation of tractography algorithms still remains a challenge, particularly in-vivo. The recently presented evaluation framework Tractometer is the first attempt to approach this …
WebProbabilistic and deterministic tractography was applied on each diffusion-weighted dataset to delineate the DRTT. Results were compared with regard to their sensitivity in revealing the DRTT and additional fiber tracts and processing time. Two sets of regions-of-interests (ROIs) guided deterministic tractography of the DRTT or the CTC ... WebWe show that in order to perform accurate probabilistic tractography, one needs to use a fibre ODF estimation and not the diffusion ODF. We use a new fibre ODF estimation obtained from a sharpening deconvolution transform (SDT) of the diffusion ODF reconstructed from q-ball imaging (QBI).
WebDeterministic-tractography-based approach for diagnosis and disease monitoring of amyotrophic lateral sclerosis. These findings suggest that the deterministic-tractography-based approach is a potential biomarker for the diagnosis and disease monitoring of amyotrophic lateral sclerosis. WebWe derive both a deterministic tractography algorithm obtaining in each iteration a tracking direction by maximum a-posteriori estimation, as well as a probabilistic version drawing a direction from the marginalized posterior distribution. Compared to fiber tracking methods that rely only on the local ODF, the proposed algorithm proves more ...
WebDeterministic tractography algorithms perform tracking of streamlines by following a predictable path, such as following the primary diffusion direction. In order to demonstrate how to perform deterministic tracking on a diffusion MRI dataset, we will build from the preprocessing presented in a previous episode and compute the diffusion tensor.
WebNov 15, 2013 · Diffusion MRI tractography has emerged as a useful and popular tool for mapping connections between brain regions. In this study, we examined the performance of quantitative anisotropy (QA) in facilitating deterministic fiber tracking. Two phantom studies were conducted. The first phantom study examined the susceptibility of fractional … orchard leigh camphill communityWebDeterministic tracking was more sensitive in detecting the CTC than the DRTT. CTC tracts were located adjacent but consistently more posterior to DRTT tracts. These results suggest that probabilistic tracking is more sensitive and robust in detecting the DRTT but harder to implement than deterministic approaches. orchard leigh gloucestershireWebJul 22, 2024 · Deterministic tractography algorithms, like the FACT method, exploit the local orientation distribution information of the diffusion process (or fibres) to reconstruct from a starting seed, a virtual connection that corresponds to the most probable propagation path within this local orientation field. This retrograde and anterograde propagation ... ipswich city council zoning searchhttp://www.ajnr.org/content/32/1/3 ipswich city council waste managementWebDec 18, 2024 · Therefore, in this study, we present a deterministic tractographic analysis pipeline using the SIGMA atlas for a detailed structural segmentation and structural connectivity analysis of the rat brain's structural connectivity. orchard layoutWebAug 15, 2008 · Deterministic and Probabilistic Tractography Based on Complex Fibre Orientation Distributions Abstract: We propose an integral concept for tractography to describe crossing and splitting fibre bundles based on the fibre orientation distribution function (ODF) estimated from high angular resolution diffusion imaging (HARDI). orchard leigh cottage portreathWebNov 15, 2013 · Diffusion MRI tractography has emerged as a useful and popular tool for mapping connections between brain regions. In this study, we examined the performance of quantitative anisotropy (QA) in facilitating deterministic fiber tracking. Two phantom studies were conducted. The first phantom study examined the susceptibility of fractional … ipswich city hall