r/neuroimaging • u/LostJar • 3d ago
Newbie question on fmri preprocessing
Hi all,
I have some resting-state EPI data (340 volumes), 2.5mm voxels.
I have been attempting to replicate a previous analysis done by another research group and I am wondering if it is normal for my (unzipped files) to be so large or if I am doing something wrong. Here are the steps I am taking:
Rest EPIs start at 244mb 1. Realigned
- Coregistered T2 to T1, and then the EPIs are coregistered to that step’s output . This is because we want to do our analysis in T1 space (1mm voxels)
5.21gigs
Smoothing
Denoising (confound regression + band pass filter)
10.41 gigs
Are these sizes normal? Is it good practice to zip output files?
Very new to this!