[AFNI Academy] SUMA introduction: Background and start GUI - YouTube
An overview of the SUMA (SUrface Mapping) functionality within AFNI.
+ We discuss standard SUMA concepts, inputs and inputs.
+ We also go through basic "suma" GUI functionality (including its
interaction with the "afni" GUI).
SUMA is useful for analyzing and visualizing data on surfaces
+ It complements our volumetric way of analyzing data
- instead of slicewise views, we can have data points on surfaces or
other geometries like tracts embedded within three dimensions
+ We generally use detailed surfaces created by other software,
e.g., FreeSurfer (FS), and then translate their results to NIFTI/GIFTI
and we make *standardized meshes*
- note that AFNI *can* generate surfaces of volumetric info, but
we generally use this more for visualization of things like ROIs
and typically don't estimate surfaces for quantitative purposes.
- note that we also provide volumetric versions of FS parcellations
that are renumbered (for AFNI colorbar viewing) and also
conveniently grouped by tissue type (WM, GM, ROI-like GM,
ventricles, CSF, other); these are the *_REN_* files.
+ We also visualize more than surfaces, for example tracts and edges
between graph nodes, slices and more.
What do you need to use SUMA? Pretty standard things:
+ For most default functionality, a standard (1 mm isotropic) T1w
anatomical volume can be used to generate one or more surface meshes.
+ One can "unifize" the brightness of the T1w volume (e.g., 3dUnifize)
but many mesh-generating softwares do that themselves (e.g., FS's recon-all
does)
Many AFNI programs work on surface datasets directly, too!
+ Any AFNI program that just treats spatial elements individual (i.e.,
"voxelwise" or "nodewise" calculations) can be run on surface dsets
+ Programs that need spatial information (blurring/smoothing, clustering,
averaging, calculating area, ...) are different.
If you just want to display volumetric-processed results on surfaces, you
can do so.
+ we have already-created FS output for MNI and TT_N27 dsets, e.g.,
- https://afni.nimh.nih.gov/pub/dist/tgz/suma_MNI152_2009.tgz
- https://afni.nimh.nih.gov/pub/dist/tgz/suma_MNI_N27.tgz
- https://afni.nimh.nih.gov/pub/dist/tgz/suma_TT_N27.tgz
There is an @SUMA_Make_Spec_* program for each of the major surface-generating
softwares
+ translates their outputs into NIFTI/GIFTI files
+ makes a *standardized mesh* of each (see Argall, Saad & Beauchamp, 2006)
- other projects have started making standard meshes now, too,
but seem to have different standardization...
Run example case of running suma+afni GUIs
+ there are lots of keypresses, buttons and options for viewing data in SUMA
+ when we say a lot, we mean a *lot*
+ many basic functionalities are demonstrated here:
- the "suma_keystrokes.txt" file in the Bootcamp handouts (also linked below)
lists many of the most fundamental keypresses
- translate, rotate, zoom, turn surfaces on/off, "open" brain as walnut
- can toggle through list of surface "states": WM boundary, pial, inflated,
sphere, etc. (same topology, different geometry)
- find help (button help, online-connected help), see mesh nodes/edges
- motion brain, save images, save movies, see RGB crosshair grids
- change colormap (Cmp), rightclick on menu buttons for scrollable list
- open multiple SUMA views, lockable
- have AFNI and SUMA GUIs "talk": send info back and forth, continue
to interact (fuuuun! and useful), can check quality of surfaces well
PRESENTATIONS:
https://afni.nimh.nih.gov/pub/dist/edu/class_lectures/2020-03-NIH/suma/suma.pdf
https://afni.nimh.nih.gov/pub/dist/edu/class_lectures/2020-03-NIH/suma/suma_keystrokes.txt
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