________________________________ From: Barletta, Valeria Sent: Friday, September 27, 2019 12:30 PM To: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu Subject: question on mris_calc
Dear Freesurfers, I am trying to perform an operation with .mgh files by using mris_calc. This is my operation:
(image1 - image2) _______________ (image2)
First I am using the command:
mris_calc -o $hemi.FILE1.mgh $hemi.image1.mgh sub $hemi.image2.mgh
And then:
mris_calc -o $hemi.FILE2.mgh $hemi.FILE1.mgh div $hemi.image2.mgh
Is this procedure correct?
Also, I have read this information about the command mris_calc functions: "Note: <file1> and <file2> should typically be generated on the same subject" But actually, my image1 belongs to a single subject, while image2 is a mean of images from many different subjects (obtained using mri_concat --mean). Is mris_calc going to work in this case?
Thank you very much for your help, Valeria