Regular ArticleInitial Demonstration of in Vivo Tracing of Axonal Projections in the Macaque Brain and Comparison with the Human Brain Using Diffusion Tensor Imaging and Fast Marching Tractography
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Diffusion MRI and anatomic tracing in the same brain reveal common failure modes of tractography
2021, NeuroImageCitation Excerpt :In white matter, this provides estimates of the local orientations of axon bundles. Tractography algorithms follow these orientation vectors from voxel to voxel and attempt to reconstruct the trajectories of white-matter pathways through the brain (Parker et al. 2002; Koch et al., 2002; Fillard et al., 2009; Kreher et al., 2008; Mori et al. 1999). Tractography is essential for characterizing brain networks (Hagmann et al., 2008; Bullmore and Sporns 2009) and, in combination with other microstructural properties derived from dMRI, has the potential to further our understanding of a plethora of neurological and psychiatric conditions.
Methods for analysis of brain connectivity: An IFCN-sponsored review
2019, Clinical NeurophysiologyCitation Excerpt :HARDI improves the accuracy of tractography by using a large number of diffusion-encoding gradients with a reasonable scanning time. After the first validation study in the macaque brain (Parker et al., 2002), a number of validation studies have been performed, with rather positive or more critical conclusions. For example, the comparison of DSI in the light of extensive autoradiographic tract tracing data on long association pathways in the monkey cerebral hemispheres was found to replicate main features of these fiber tracts (Schmahmann et al., 2007).
Fusing DTI and fMRI data: A survey of methods and applications
2014, NeuroImagePotential and limitations of diffusion MRI tractography for the study of language
2014, Brain and LanguageCitation Excerpt :It is not a “strength of connection”, and says nothing at all about the strength of synapses, which can exhibit short-term plasticity that is not detectable with diffusion MRI. The streamline count shows a marked dependence on the length of the pathway, that might be alleviated by the use of other connectivity indices, such as comparison to the null distribution (Morris et al., 2008), or the “weakest link” approach (Parker et al., 2002; Campbell et al., 2011). Streamline count also depends on the size and shape of the reference region, and the shape of the tract itself.
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These authors contributed equally to this work.