Thank you very much. I did all the preprocessing steps now. And after I
finished all first level analysis I get many results like the glass
brain image I attached. But it seems to me that the preprocessing worked
not so well because there are clusters, which are under the glass brain
and no clusters directly at the upper part. For my study it is important
to analyze the whole frontal area. Therefore my question: How can I
solve this problem. Is it a problem of the different voxel sizes? With
the Cheg Reg the EPI and canonical images seem to be in the same
orientation.
Best regards,
Benjamin
Am 20.02.2013 13:16, schrieb John Ashburner:
> Sorry, I should have said 30 mm (or 3 cm).
>
> -J
>
> On 20 February 2013 12:14, John Ashburner <[log in to unmask]> wrote:
>> SPM should take care of voxel-sizes, providing they are set correctly
>> in the headers. Just use the data as is - providing the orientations
>> and position are reasonably close to those of MNI space (within about
>> 30 cm and 15 degrees). You can use the Check Reg button, selecting
>> your image and one of the MNI-space images released with SPM (eg from
>> the "canonical" folder).
>>
>> Best regards,
>> -John
>>
>> On 20 February 2013 10:14, Benjamin Albrecht <[log in to unmask]> wrote:
>>> Dear SPM list,
>>>
>>> I have a question regarding the voxel sizes. I want to preprocess data from
>>> a 3 Tesla Trio. Therefore I have EPI images with a voxel size 3*3*3 mm and a
>>> MPRAGE image with voxel size 1*1*1 mm. How can I normalize or segment the
>>> data also with the template image with a voxel size of 2*2*2 mm? Can I
>>> recalculate the images to the same voxel size or what should I do?
>>>
>>> Thanks
>>> Benjamin
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