Yes, you can also just use fscalc image1.mgh sub image2.mgh div image2.mgh -o final.mgh

On 10/7/2019 10:40 AM, Barletta, Valeria wrote:

________________________________ From: Barletta, Valeria Sent: Friday, September 27, 2019 12:30 PM To: freesurfer-bounces@nmr.mgh.harvard.edumailto:freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edumailto: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

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