Tiziana
On Jul 5, 2011, at 5:26 AM, Tiziana Quarto <[log in to unmask]> wrote:
> Dear Darren and SPMers,
> From the previous mail in this topic I understand that, since my fMRI data are acquired interleaved (TR:2), I have to do the slice timing correction as the first preprocessing step and that I can not modulate slice timing during DCM.
Correct
> But, is the slice timing correction only suggested for data that I intend to use in DCM, or when slices are acquired interleaved slice timing correction should be always done?
> My knowledge so far was that the slice timing correction during preprocessing was not recommended in general, and in the SPM8 manual there is also written that this option is going to be removed in the next version of SPM. This sentence seems to me to be incoherent with the fact that this option is required if I want to do DCM with interleaved fMRI data.
> Could you help me to clarify this issue?
I think any reports of the death of slice timing have been greatly exaggerated (to paraphrase Mark Twain, who probably never used slice timing, but I digress...)
Please see this article:
Sladky et al., Slice-timing effects and their correction in functional MRI. Neuroimage, in press.
http://www.sciencedirect.com/science?_ob=GatewayURL&_origin=IRSSCONTENT&_method=citationSearch&_piikey=S1053811911007245&_version=1&md5=c1c11f9521691120bde989a3d51da89e
I hope this helps.
--------------------
Darren Gitelman, MD
Sent from my mobile.
Office Ph: (312) 908-8614
Fax: (312) 908-5073
> Thank you very much in advance,
> Tiziana
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