[FieldTrip] segmented brain seems not fitting the sensor helmet well

[jan-mathijs schoffelen]

Hi Ye,

Looks like a coregistration problem to me. In other words, something went wrong in ft_volumesegment, because the images were not sufficiently aligned. You need to investigate the input and output of ft_volumesegment.
Do you use ft_volumerealign after calling ft_volumesegment? This should be the other way around.

Best,

Jan-Mathijs


On Feb 28, 2013, at 5:38 PM, Ye Mei wrote:

> Hello FieldtripList,
> 
> After segmentation and alignment using
> 'ft_volumesegment' and 'ft_volumerealign', one of the subjects' segmented
> brain seems rotated forward in the sensor helmet(brain.png) and the
> cerebellum part seems to be segmented out. However, his head MRI seems
> fitting the sensor helmet well(head.jpg). My another subject's brain
> seem to be correctly segmented without missing the cerebellum part. And
> the brain is not rotated forward.
> 
> Could might be the problem?
> 
> thanks ahead,
> Ye
> <brain.png><head.jpg>_______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

Jan-Mathijs Schoffelen, MD PhD 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

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