Seed Point

A factor requiring careful consideration is the initial point of tract propagation, as this choice influences the relative effect of noise on the propagation itself. A frequently adopted solution is to use a number of equidistant seed points arranged on a grid space. This reduces the variance connected with the arbitrary choice of the seed point. However, a seed point acceptance criterion maybe applied to avoid selecting voxels not containing fibres. One useful criterion is a minimum FA value ensuring the presence of a distinct fibre at the seed point. It is worth stressing that, since the directions identified in each voxel by the diffusion tensor do not have an orientation (see Fig. 8.2), a forward and a backward pathway, lying on the same straight line but running in op posite directions, are consistently generated at seed points.

Was this article helpful?

0 0
Unraveling Alzheimers Disease

Unraveling Alzheimers Disease

I leave absolutely nothing out! Everything that I learned about Alzheimer’s I share with you. This is the most comprehensive report on Alzheimer’s you will ever read. No stone is left unturned in this comprehensive report.

Get My Free Ebook


Post a comment