Dear SPMers,
I am learning SPM96 by analyzing the data in the SPM website (i.e.,
MoAEpilot data, for fMRI). Last time I have a trouble in Coregistration step
but it was fixed by advice of SPM mailbase community. Thanks lot.
Now I have a problem in normalisation.
I realigned the fM* images specifying Coregister&reslice => sinc
interpolation => mean image only. It was successful. I got rf*.imgs and
mean*.img.
Then I coregistered sM* structural image, with options as Coregister
only => target=sM*img(T1) => object=mean*.img(T2). Now this was successful,
I got rmean*.img.
For Normalisation, I selected stuctual image (s*.img) for "image to
determine parameter from", and realigned rf*.imgs for "image to write
normalised", and T1.img for "templates". SPM did not complain and worked
without any error massages. I got nrf*.imgs.
I displayed a nrf*.img, and here is a problem. The brain's shape looks good
(i.e., normalised) but it is out of position. That is, the center of the
image is moved to right side so that the right 1/3 portion is out of the
display window. I suspect that this problem occurs because the origin values
etc. in the header are wrong. The red lines representing x-y axis look
mispositioned, too (i.e., different form the axis position of the template).
If so, I need to learn when and how I should change these parameters...
Could anyone provide any suggestions?
Sincerely
Chikashi Michimata, Ph.D.
Cognitive Psychology Lab.
Psychology Department
Sophia University
7-1 Kioi-cho, Chiyoda-ku,
Tokyo 102-8554
Japan
tel: +81-3-3238-3659
fax: +81-3-3238-3811
email: [log in to unmask]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|