Hi Satra,

yes, this is a bug that I know about that effects the occasional surface. I wouldn't worry about it, as the problem is no doubt tiny and only one place in the surface. I think we have a fix for it, but we haven't tested it thoroughly yet. There's no easy way to localize it, except the way we do with the topology fixing, or with some graph theoretic methods.

Bruce

On Mon, 22 Mar 2004, Satrajit Ghosh wrote:

Hi,

Here is the output of lh.euler.orig for a particular subject:

euler # = v-e+f = 2g-2: 149150 - 447444 + 298297 = 3 --> 0 holes F =2V-4: 298297 != 298300-4 (-1) 2E=3F: 894888 != 894891 (-3)

total defect index = 4

Is there a way of determining which parts of the surface and therefore which parts of the volume are giving rising to the defects? It's likely I can write some surface analysis code to do this, but I'm hoping freesurfer already has something of this sort available.

Thanks,

Satra