Hi Kent,
Thanks for the suggestions.
Is the EPI template in Talariach planes, i.e. Is AC-PC line along the
y-axis? I re-oriented my images to the Talariach planes and origins at AC
before realignment.
I did turn "brain mask" off for normalization; although in one
set, normalization worked without distortion only when brain mask was on.
There is no distortion in my normalized images that I can visualized, but
the origins of the norm images for different subjects are at different
anatomical "reference points", so I am worrying about coregistration
between subjects.
Sincerely,
Simon Au Young
MSc. Program, Experimental Medicine
University of British Columbia
> they look as close (in orientation) to the EPI template as possible). This
> has been discussed previously on the list and in our experience it helps out
> quite a bit. Also, it would be important to know what parameters you are
> using for spatial normalization. Depending upon the nature of your data,
> one may need to adjust the default options of the spatial normalization. In
> particular, you may get better results if you turn off the 'brain mask'
> function (according to spm authors this was originally intended for PET
> data). A number of groups have found that, if enabled, this option can
> distort the images. In particular, brains that are larger than normal show
> poor normalization if this procedure is enabled.
>
> Best regards,
> Kent
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|