Hi Sylvia,

Two things you can do:

1) With regard to the label, the number your SegPostProcess has to have is the same label that your input segmentation has in the structure you have to analyze i.e. if the input has the structure segmented with label x this is the value that goes in the label argument. The same with regard to GenParaMesh, the label that the postprocessed image has is the one that goes in the label argument. On this regard I can tell you I am sure SegPostProcess relabels to value 1. That should be the value that goes to GenParaMesh.

2) This is a different issue. The Euler number (see http://en.wikipedia.org/wiki/Euler_number_(topology)) is something that defines the topology of your object. SPHARM needs spherical topology to work (Euler number = 2). That means you have to check the topology of your binary volume (i.e. using ITKsnap) and testing that there are no holes on it.



Regards,
BEATRIZ