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qazit t1_jed8uu5 wrote

If an MRI voxel is 1 cubic mm, that just means that the MRI can’t resolve anything smaller than that. If a significant proportion of that 1 cubic mm is made up of white matter, no matter the thickness of the white matter, you’ll see evidence of the white matter in that voxel.

An analogy would be a pixelated image. If you look at a pixelated image of somebody wearing a shirt with some symbol on it that has a lot of thin lines, but is a distinctly different color than the rest of the shirt, you will still see a contribution from that colored symbol in a pixelated image of the shirt.

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Zealousideal-Alarm37 OP t1_jegwhtc wrote

DTI, which has a lower resolution than other forms of MRI, supposedly maps the paths axons take in white matter and show the physical connectivity of the brain.

Are these Voxels overlapping to any extent to artificially make higher resolutions? Or is there something I'm missing.

There's a fine line between mapping where white matter is and mapping the individual connections and directions within. I'm having trouble wrapping my head around that, I know that DTI can read for diffusion resistance and thus directionality, but that would seem to require a higher resolution given the complexity of the white matter tracts.

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