Dear Hongyu,
I'm not sure exactly what the problem is here.
You are asking how to improve the registration
but you also say that the registration were "not bad".
You also have a whole brain EPI which suggests
that your axial fMRI data are partial brain, but I am
not sure. Is your structural a whole brain image?
Does the overlap of the fMRI on the structural show
that parts of the brain are lost due to limited FOV?
Sorry, I really need more and clearer information
in order to help.
All the best,
Mark
On 25 Feb 2010, at 20:43, Hongyu Yang wrote:
> Hi list,
>
> We have a problem on registration, which bothered us very much.
>
> We are doing an fMRI study including 2 runs for each subject. We got
> a t1
> sagittal structure image and two axial fMRI data. For the TR=1.7, we
> lost most
> cerebella for the fMRI data, and we collected a short EPI whole
> brain image for
> registration. The basic results for the two runs were OK, however,
> when we
> combined the two basic results into one with fixed effects, we found
> some
> activated areas, such as OFC and occipital areas were beyond the
> structure
> image. Checked the registration results, it seemed the registration
> were not
> bad. For we used initial image, main image and standard image for
> registration,
> we tried to change the parameters of DOF to get good results.
> Unfortunately,
> any changed for the DOF did not make the results better. Can you
> give us
> some suggestion on this issue? Or can you help us to check the
> results of
> registration?
>
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