External Email - Use Caution Hi Dylan,
Give this a try: fscalc gm_lh.nii.gz div wm_lh.nii.gz --o gmwmratio_lh.nii.gz On Wed, Feb 23, 2022 at 12:24 PM Tisdall, Dylan < mtisd...@pennmedicine.upenn.edu> wrote: > External Email - Use Caution > > Hi all, > > I've generated two surface overlays, using mri_vol2surf with positive and > negative projfrac to get a GM and WM samples (gm_lh.nii.gz and > wm_lh.nii.gz). I'd now like to take the vertex-wise ratio of these two > overlays, and make a new one (gmwmratio_lh.nii.gz). I've tried doing this > as: > > fslmaths gm_lh.nii.gz -div wm_lh.nii.gz gmwmratio_lh.nii.gz > > but the result is: > > Image Exception: #22 :: Failed to read volume gm_lh.nii.gz > Error : Error: Nonsensical ROI for gm_lh.nii.gz > > Is there another tool I can use to compute this ratio? Is there a better > workflow than making two surfaces and dividing? > > > Thanks, > Dylan > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://secure-web.cisco.com/1Pyl66I_3XVo-h6e2JTyK2OSc2wi4d_XS3wRzXuOuXVzgG1r0ow6a8GOZwHKNySYyRQ_c4m7Auhad1MuMYtPeZy4jIuGOMRlBrHHYjmt2H4J0lfRLjIeEfLLIJlgBP54gCQzM0s6Qc6gFqXo7KI4HfYajKElx-p3fA-ZM21NQ4ZqSEe_8Q-TsRmhvYaAcg1szVagfGLdsJOOqsvK83x2eI5vAf1xvn9w4dG-veVcpUM9V3LQ0U2a5DoWv7v5RP2jgdPerixssAqhCHKx5cUVDP-bqpqa_mRrYnPzpeZmCema7KFmVBeefC40UqrM01eI8_zEZ7k67i2BDelWGYEu4Rg/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer >
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