Hi Ajay,
You can interpolate your images to have any specific voxel dimensions.
Obviously, it does not means that your going to obtain more resolution
as this is limited by image adquisition. What I mean is that if you need
an isotropic voxel dimmensions it is better to interpolate your images
to 0.938 mm^3 since you are not losing resolution (but you are not
getting more resolution neither!). If you interpolate to 1.5 mm^3 you
are losing resolution.
I think you can do the resizing using reslice.m or reorient.m functions
from JohnsGems.
hope this helps
Jose
PS: You can use superresolution methods to efectively increase the voxel
resolution but this is another story!
<http://www.sph.umich.edu/%7Enichols/JG99/reslice.m>
Ajay Kurani escribió:
> Hi Jose,
> Thank you very much for your response. The one question I have is
> that if my native resolution is .938x.938x1.5mm^3 i thought that my
> limiting resolution is the largest dimension. Is it possible to
> increase the resolution from 1.5mm to .938mm? I know i can always
> decrease from .938 to 1.5 but I wasn't sure if the other way is possible.
>
> Thanks,
>
> Ajay
>
> On Thu, May 13, 2010 at 2:44 AM, jmanjon <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> Hi Ajay,
>
> I don´t know what people is doing out there but I would suggest
> you to go to 0.938 mm^3 not to 1.5 mm^3. If you chose the first
> option you maintin your resolution but if you use to the second
> you loose resolution so the choice is quite clear.
>
> hope this helps
>
> Jose
>
>
> Ajay Kurani escribió:
>
> Hi SPM users,
> I have read that in order to use DARTEL the GM/WM images must
> be imported as isotropic voxels after rigid body
> transformations. My original image is .938x.938x1.5 so would
> my isotropic voxels be of since 1.5x1.5x1.5 or can i go
> smaller by reslicing the image? Also, is reslicing only used
> when comparing fMRI data or can I reslice my T1 weighted image
> for VBM analysis?
>
>
> Thanks,
>
> Ajay
>
>
>
>
>
> --
> ________________________________________________________
>
> Dr. Jose V. Manjón Herrera ------- [log in to unmask]
> <mailto:[log in to unmask]>
> home: http://personales.upv.es/jmanjon
> [IBIME - Biomedical Imaging Area]
> BET - Bioengineering, Electronics and Telemedicine Group
> UPV - Politechnical University of Valencia - Spain
> ________________________________________________________
>
>
--
________________________________________________________
Dr. Jose V. Manjón Herrera ------- [log in to unmask]
home: http://personales.upv.es/jmanjon
[IBIME - Biomedical Imaging Area]
BET - Bioengineering, Electronics and Telemedicine Group
UPV - Politechnical University of Valencia - Spain
________________________________________________________
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