I created some .hdr files for the images and had a look, but couldn't see
anything wrong. All I could see was that the first and last slices were
mostly empty, due to the masking procedure used when the resliced images
are written.
Best regards,
-John
| Date: Wed, 16 Aug 2000 12:52:08 +0200 (MET DST)
| MIME-Version: 1.0
| Subject: Register & Realign with SPM
| From: "Guillaume Marrelec (stg HB 2000 -projet INRIA)"
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| Hello,
|
| I need your help and advice on the following topic. I wanted to realign fMRI
| data with SPM. I first used "Slice Timing" to produce aV* files. This process
| gave good results as far as I can judge. I then used "Realign" on those aV*
| files, with sinc interpolation, the default (*) options and "yes" to sampling
| correction.
|
| If you visualize the resulting files (two of which I have attached to this
| mail), you'll clearly notice that there is something wrong. Actually, on every
| realigned volume that I have checked, the first and last slices are very
| strongly artifacted. I went through the process twice, and I got the same,
| disturbing, result twice, even though the curves included in the "spm99.ps"
file
| don't show anything abnormal.
|
| Can this be related to the fact that we only have 8 slices per volume? We have
| never had this problem before, when treating acquistions with 14-slice
volumes.
|
| Thank you!
|
| Guillaume
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