Hi Yash

we already create the volumetric representations for you (e.g. the aparc+aseg.mgz). You should be able to use it to generate histograms of each parcel in 5-10 lines of matlab code

cheers
Bruce


On Wed, 22 Aug 2018, Yash Patel wrote:

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Hi FS experts,

I am attempting to extract signal intensity from the middle of the cortex, using mri_vol2surf. With said surface, I would like
to extract the mode (and other histogram measures) from each of the 34 parcellations of the DK atlas. I realize this needs to
be done in matlab, and hence the difficulty. Would I need to first convert the segmentation volume (such as lh.aparc.annot )
into ".mgh" format, and use it with the output of mri_vol2surf which would be in ".mgh" surface format. Since I am a complete
beginner to matlab exemplary code would be very helpful.

Thank you,
Yash 

On Wed, Mar 14, 2018 at 6:26 PM, Douglas N. Greve <dgreve@mgh.harvard.edu> wrote:
      No, sorry. You can do it easily enough in matlab, eg

      seg = MRIread('seg.mgz');

      input = MRIread('input.mgz');

      ind = find(seg.vol == SegNo);

      segmode = mode(input.vol(ind));

      [h x] = hist(input.vol(ind),100);



      On 03/13/2018 07:58 PM, Yash Patel wrote:
      > Any updates or ideas in extracting histogram data from mri_segstats?
      >
      > On Sun, Mar 11, 2018 at 1:16 PM Yash Patel
      > <ypatel@research.baycrest.org <mailto:ypatel@research.baycrest.org>>
      > wrote:
      >
      >     Dear all,
      >
      >     I am using mri_segstats to obtain intensity values from each of
      >     the 34 cortical parcellations in the Desikan-Killiany Atlas; this
      >     provides metrics such as mean, min, max, range, and standard
      >     deviation.
      >     Is there a way to extract information such as the *mode*, or
      >     information to create a histogram for each of the particular regions?
      >
      >     Thank you,
      >     Yash
      >
      >
      >
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