3
$\begingroup$

I have collected a EPI BOLD sequence data using Siemens skyra 3T. The voxel size is 3x3x3 mm^3. TR = 2s. I am seeing Gibbs artifact similar to the image:

enter image description here

People have suggested to smooth the data to get rid of it. But I will be doing MVPA (multi Variate Pattern Analysis). Since MVPA relies on spatial pattern, smoothing it is a bad idea. So can you please let me know if my results will be influenced by Gibbs artifact? Also, from whatever I read, Fourier reconstruction at lower spatial resolution could lead to this artifact. Can any MRI scanner hardware issue cause this artifact, like heating up of RF coil, etc.

$\endgroup$
3
  • 1
    $\begingroup$ Hi Aakash, welcome at CogSci. I made some minor edits to make your question more legible. Could you perhaps provide some extra clarification to your question. For example, why is smoothing the data troublesome for MVPA? $\endgroup$ Apr 24 '17 at 6:48
  • $\begingroup$ Hi Aakash, do you have a second account? I saw @AakashAgrawal make a suggested edit. If so, please stick to one account. It makes it easier for you to gain reputation and to organize other SE.networks $\endgroup$ Apr 26 '17 at 6:41
  • $\begingroup$ I'm unfamiliar with this field, but the link you give for smoothing says in the abstract "Moderate smoothing (up to 2.2 mm) improved the accuracies..." $\endgroup$
    – mflo-ByeSE
    May 13 '17 at 17:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.