Dear Debbie,
After slice-time correction, you will get the same number of files as you
had before, i.e. 400 in your case. Interpolating the time series to 1200
images is neither required nor would it really help you.
The total number of images does not determine whether you should perform a
slice-time correction or not. More important is, however, what you are
planing to do with the data, whether it is an event-related design or not,
etc.
Good luck,
Karsten
Den 19.06.13 14:39 skrev "SUBSCRIBE SPM Debbie Cheng" <[log in to unmask]>:
>Dear all,
>
>I have a question about doing slice timing in SPM.
>After reading some articles and the SPM manual, I realize that doing
>slice timing correction in fMRI data can make all the slices of an image
>be corrected in a same time point.
>In my case, for example, I have 400 images of a subject in one experiment
>which is using event-related design module, and TR = 3 s.
>That is, the whole information in those 400 images pass through 1200
>seconds.
>If I perform slice timing correction as my pre-processing before doing
>other spatial processing, do I have only 400 time points information as
>the output results? (Because there are 400 output images after doing
>slice timing)
>If I need all the information through an experiment (1200 seconds),
>should I interpolate the slice timing correction results (400 images) to
>1200 images?
>
>Moreover, I would like to know that if the number of the images is large
>as my case, should I perform slice timing as the pre-processing?
>
>
>Best Regards,
>
>Debbie
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