Hello,

I got a warning message when I used 3dmaskave as below:
=========
Input dataset func_s1_right_decon14+orig[Pos-Neg_GLT#0_Coef] grid mismatch from mask.
Try the following command for grid comparison:
3dinfo -header_line -prefix -same_all_grid ./ROI_put_R+orig.HEAD ./func_s1_right_decon14+orig.HEAD
=========

However, I ran the 3dinfo shown above and found that the grid information of the two data sets are the same, as below:
=========
prefix =dim? =delt? =ornt? =cent? =obl?
ROI_put_R 1 1 1 1 1
func_s1_right_decon14 1 1 1 1 1
=========


I have two EPI scans (s1 and s3) in my experiment, with the same scanning protocol except different oblique angle between the scans.
=========
>> 3dinfo -header_line -prefix -same_all_grid ../s1/s1.nii ../s3/s3.nii
prefix =dim? =delt? =ornt? =cent? =obl?
s1.nii 1 1 1 1 0
s3.nii 1 1 1 1 0
=========
During preprocessing, I removed the oblique information with 3drefit -deoblique, for both the EPI scans as well as the anatomy image. The alignment between the EPI and anatomy images was good. However, the warning message only appeared for the s1 scan when I ran 3dmaskave, and also, the 3dinfo did not show any mismatch between the files of ROI_put_R+orig.HEAD and func_s1_right_decon14+orig.HEAD.
I am confused by the warning message.

Any suggestion or idea on the issue would be appreciated. Thank you very much.

-- Nan