Hi,

I have preprocessed and denoised resting state data for a dataset with two sessions. Of these some functional files (dswau*.nii files) have a strange image (non-black background) for a session, while the other session shows a normal image. I've attached the images for the two sessions (with abnormal background image of the second session) for comparison. 

Can anyone help with explaining what exactly is happening here?

Thanks!

Mohini