Hi Lea

the Euler number is an integer, so it will never be 2.5. In fact, in our reconstructed surfaces it will always be exactly 2, except for the *nofix* surfaces, as we explicitly correct the topology of the surfaces (see the Automated Manifold Surgery paper if you are interested in the details)


On Thu, 12 Jul 2018, Backhausen, Lea wrote:

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Hey Freesurfer Experts,

I would like to use the Euler number as a quantitative quality measure of my 
reconstructed data as
Rosen et al. (2017) recommend in their recently published paper.

I figured I can use:

mris_euler_number [<options>] insurf     to get the euler number for each data 

Which surface should I use though? The white or pial surface area or is there 
no preference?

Does anybody have experience with what range of Euler number would be 
acceptable? I read that 2
would be perfect but is 2.5 still ok? Or 1? Somehow I could not find any 
recommendation in the Rosen
paper about thresholds or something similar. Did I miss something?

Any advice would be highly appreciated! Thanks!



Lea Backhausen, B.Sc.

Student Research Assistant

Klinik und Poliklinik für Kinder- und Jugendpsychiatrie und –psychotherapie
Tel. +49 (0)351 458-7166
Fax +49 (0)351 458-5754

Universitätsklinikum Carl Gustav Carus
an der Technischen Universität Dresden
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Vorsitzender des Aufsichtsrates: Prof. Dr. med. Peter C. Scriba
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