Hi Avi

1. the size of the triangles is currently specified more-or-less by the resolution of the input data. We cover the surface of voxels.

2. The triangles start life as uniform, but then smoothing and topology correction will make them different sizes. It's hard to predict where.

cheers Bruce

On Wed, 22 Nov 2017, Avideh Gharehgazlou wrote:

Dear FreeSurfer experts,  I have a question regarding the tessellation step, in which the surface is covered by a mesh of triangles.

1. How would the number/sizes of triangles be affected/ alter as a result of different brain

volumes/sizes of different subjects? i.e. would a subject with a bigger brain volume have greater number of triangles compared to a subject with a smaller brain volume? Or will the subject have the same number of triangles, but larger triangles instead?

2. I am aware that the triangles are not uniform like the voxels in a VBM... within a particular

subject, how are the sizes of triangles determined in different parts of the brain? What determines which parts of the brain will have smaller/larger triangles compared to other parts of the brain?

Would really appreciate your input,

Thanks,

Avi

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