[Marsbar-users] import issues - help much appreciated!

[becky_lawson <reb...@uc...>]

Hello,

Hello, I made some native space ROIs in MriCron (NIFTI .img/.hdr files) and
imported them to marsbar (using the import function) in order to have
marsbar readable versions of said ROIs so that I could perform a signal
extraction from associated  beta images using marsbar. This all worked fine.
My results look great.

I would now like to calculate a ratio of average roi volume to wholebrain
volume for each of my subjects. I have a whole brain mask (NIFTI .img/.hdr)
which I would like to import into marsbar (effectively treating it as a
large ROI) in order to view the marsbar-calculated whole brain volume to
work out my ratio.

When I import said whole brain mask using the masrbar GUI or a script it
produces multiple wholebrain_n_roi.mat files (as little as ten or as many as
a couple of hundred! - either way, I was expecting a single
wholebrain_1_roi.mat file that relates accurately to the whole brain mask
(.img/.hdr) image that I imported). These individual files, when viewed in
marsbar, appear imcomplete in themselves and, while a vague approximation of
the mask I originally imported, are poor quality and many in number.

I'm a tad confused now. When I imported my individual subject ROIs the
output was just a single roi_1_roi.mat file for each subject as I expected.
These imported ROIs look fine when viewed in marsbar, although the ROI is
very small (~30mm3) so it's difficult to be absolutely sure that something
hasn't gone amiss here as well as when importing the whole brain masks.

I'm not sure what to do next. Any help appreciated!

Becky.
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