Hi,

I am trying to remap a volume. I am using aparc+aseg.mgz volume. I loaded it into Matlab using load_mgh. In Matlab I remap the volume to different values. For example, all original values of 1022 will become 200 and all 1030 values will become 150. (This is just an example, not necessarily these numbers.) I save a new aparc+asegNew.mgz file using save_mgh. I use the same M and mr_parms that I got when I loaded in the original file. I'm not sure what these mean or if I need to change them. Then I use mri_vol2surf to create a new surface overlay onto the inflated hemisphere. When I do this, each region such as post central gyrus is 2 colors spotted together instead of a solid color like in the original. I have attached pictures as an example of what the original and remapped looked like. I didn't change the location of values, just simple gave each value a new one. Why is the one value speckled throughout?

Thank you,
Anna

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