Hello,
I think this actually is an exceptionally informative error message :)
It tells you that your data is not of a high enough spatial resolution
(6.5 mm slice thickness) - what is considered necessary by the program
is 5 mm, which already is generous. VBM type analyses are usually done
on T1 3D datasets, while your dimensions indicate you have an axially
acquired 2D sequence with a limited number of slices. Consequently,
results are likely to be quite a bit off due to partial voluming. This
therefore is not an error, the program simply refuses to embark on a
processing journey that will likely lead to no good.
If this indeed is the correct voxel size than I think the program is
correct in not proceeding. There is no easy fix for this as your data
has been acquired with this resolution and there is no post-hoc way to
generate data which has not been acquired. You could conceivably trick
the program to still accept your data but I would strongly argue against it.
Cheers
Marko
Negar Chabi wrote:
> Dear Experts,
>
> I faced with " Cat12 segmentation failed" message after selecting the
> volumes in the preprocessing module in CAT in "Segment Data".
> This error is as follow:
> Failed 'CAT12: Segmentation'
> Error using cat_run_job (line 78)
> Voxel resolution has to be better than 5 mm in any dimension
> for reliable CAT preprocessing!
> This image has a resolution 0.47x0.47x6.50 mm³.
> In file "C:\Program
> Files\MATLAB\R2016a\toolbox\spm12\toolbox\cat12\cat_run_job.m" (v982),
> function "cat_run_job" at line 78.
> In file "C:\Program
> Files\MATLAB\R2016a\toolbox\spm12\toolbox\cat12\cat_run_newcatch.m"
> (???), function "cat_run_newcatch" at line 13.
> In file "C:\Program
> Files\MATLAB\R2016a\toolbox\spm12\toolbox\cat12\cat_run.m" (v971),
> function "run_job" at line 246.
> In file "C:\Program
> Files\MATLAB\R2016a\toolbox\spm12\toolbox\cat12\cat_run.m" (v971),
> function "cat_run" at line 106.
>
> The following modules did not run:
> Failed: CAT12: Segmentation
>
>
> How I can resolve it? Any help would be greatly appreciated.
>
> Regards.
> --
> Negar Chabi
> Msc of Biomedical engineering
> Persian Gulf Nuclear Medicine Research Center
> Bushehr University of Medical sciences
--
____________________________________________________
Prof. Dr. med. Marko Wilke
Facharzt für Kinder- und Jugendmedizin
Leiter, Experimentelle Pädiatrische Neurobildgebung
Universitäts-Kinderklinik
Abt. III (Neuropädiatrie)
Marko Wilke, MD, PhD
Pediatrician
Head, Experimental Pediatric Neuroimaging
University Children's Hospital
Dept. III (Pediatric Neurology)
Hoppe-Seyler-Str. 1
D - 72076 Tübingen, Germany
Tel. +49 7071 29-83416
Fax +49 7071 29-5473
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