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NOTES

 
 siena_diff - cannot compile with optimisation turned on (gcc bug)
 
+37744 nonzero voxels in avg152T1_edges
+say 20000 real edge voxels (ignoring corner points)
+
+smooth with sigma=10mm=5voxels
+thus 1 resel = approx 100 voxels
+but intrinsic smoothness factor = 2
+-> 200 voxels
+
+thus bonf correct by factor of 100
+thus uncorrected 0.05 -> 0.0002 -> z=3.7

siena_diff.c

@@ -601,6 +601,7 @@ seg1=im.i;
 
 for(x=0;x<size;x++)
   if (seg1[x]>1)
+     /*if (seg1[x]>2)*/
     seg1[x]=1;
   else
     seg1[x]=0;