Dear Kylin,
The size of the normalised images is determined via something called the "bounding box". This means the templates are indeed used for spatial normalisation (and, for SPM, are in register with your normalised images, as you can check via the CheckReg button), but the final images are written in a smaller matrix, mainly to save disk space.
As long as you stay within SPM (SPM2, I presume?) and are not interested in the inferior cerebellum, this is a rather useful feature. If for some reason you need your normalised images to correspond to the MNI/ICBM152 template space in terms of matrix dimensions, you can specify that you want the images written in a 91x109x91 matrix by setting the bounding box to "template" (in Defaults -> Spatial Normalisation -> Writing Normalised).
Enjoy,
Alexander
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]]On Behalf Of kylin
Sent: 12 September 2005 12:53
To: [log in to unmask]
Subject: [SPM] A question about the image size
Dear all,
I am a beginner of SPM. There is a quention puzzled me so much. The question is that there is a different image size between the normalized image and the templates image.Namely, the normalized image is 79*95*69(x*y*Z),
but the template image(EPI.mnc PD.mnc PET.mnc SPECT.mnc ) is 91*109*91(x*y*z).
I thought it should be the same size between the normalized image and the templates image ,but I was wrong.
why dose these are different image size?
Thank you very much for your kind help
Kind regard
kylin
[log in to unmask]
2005-09-12
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