AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Ana Navarro Cebrian
December 20, 2019 10:22AM
Hi all,
I often see in papers that the first two preprocessing steps they use are:
First, compensation of systematic, slice-dependent timeshifts.
Second, elimination of systematic odd-even slice intensity differences caused by interleaved acquisition.

I'm a little confused with the second... Aren't odd-even slice intensity differences caused by slice-dependent timeshifts as well? Aren't these two steps talking about similar things?

Also, I understand that you can deal with one of these problems in afni using interpolation (tshift), right? What about the other?

Thanks for your advice.
Best,
Ana
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Subject Author Posted

Preprocessing data: timeshifts

Ana Navarro Cebrian December 20, 2019 10:22AM

Re: Preprocessing data: timeshifts

rick reynolds December 23, 2019 09:22AM

Re: Preprocessing data: timeshifts

Ana Navarro Cebrian December 23, 2019 10:47AM