Hi all,
I'm hoping someone can help me. I am using a structural template that I built in ANTS (91x109x91; 2mm isotropic res) for coregisteration & normalization of my functional (EPI) images.
I've noticed after normalization tht the normalized coregistered images have the dimensions 79x95x68. I understand this is due to the bounding box used in SPM which essentially changes the FOV of the images. What I don't understand is what SPM does to the template. If the template remains the same after pre-processing has been done (91x109x91) does this mean that SPM does not apply any bounding boxes to the template image?
I have run cross-correlations in ants with the template & all normalized coregistered images, to measure the coregisteration accuracy. The 'origin' of the images however does not match that of the template. From my understanding, by definition spatial normalization should result in images that are in the same space with the same dimensions & point of origin.
Can someone pleas explain why I am getting these findings & if they are correct/expected.
Thank you,
Rebecca
|