Just to add to my last post, it seems as if the Talairach origin is not
carried over by Flirt either.
Krish
>Hi there,
>
>I've got myself into some laterality difficulties with negative voxel
>dimensions. Let me explain what I did:
>
>1) Using flirt I registered a radiological axial volume to the FSL T1 template.
>avwhd now reports that this has voxel dimensions of -2,2,2 mm which is correct
>I think.
>
>2) I took the registered volume generated in the above step and passed it
>through Flirt to generate segmentation maps. avwhd now reports that the voxel
>dimensions for the segmented images are 2,2,2 which I don't think is correct as
>they should be the same as the input image.
>
>Is the above behaviour expected? It causes me some problems because my
>software, mri3dX, assumes that if you overlay one volume on another and their
>horizontal voxel dimensions have different signs, then it needs to flip the
>laterality of the overlay. In the case of the above, this is clearly not the
>case.
>
>All the best,
>
>Krish
--
Dr K.D. Singh
Senior Lecturer and Convenor of the Neuroimaging Research Group,
Director, MRI Research Centre,
Neurosciences Research Institute
Aston University, Birmingham B4 7ET, U.K.
Tel/Fax: +44 (0)121 [204 3865/3864]/[333 4220]
[log in to unmask], http://www.aston.ac.uk/lhs/staff/singhkd/
|