Introduction to FreeSurfer Output

Challenges

In these challenges you will practice some of the terminal commands and FreeView features you used above.

Challenge 1

Difficulty: Beginner

Goal: Practice basic Freeview tasks.

In the examples above you looked at data from a subject called “good_output”. For this challenge complete the following tasks for subject “subj_004”.

  1. Open the subject’s aparc+aseg.mgz volume with a colormap of “lut”.
  2. Swap the view to sagittal
  3. Navigate with the arrow keys to find the right putamen

Need a hint? Here is how you opened up a similar volume for the “good_output” subject:  freeview -v good_output/mri/aseg.mgz:colormap=lut  Want to know the answer? Click and drag to highlight and reveal the text below.

freeview -v sub_004/mri/aparc+aseg.mgz:colormap=lut

Challenge 2

Difficulty: Beginner

Goal: Practice visualizing data with overlays.

  1. Open subj_004’s lh.pial surface, with the overlay names lh.thickness, set the overlay to display with a threshold of 1,2
  2. If needed, swap to the 3d view
  3. Find the orbitofrontal cortex (Look for a thin cortical area in the frontal lobe)

Need a hint? Here is how you opened up a similar surface for the good_output subject:  freeview -f good_output/surf/lh.inflated:overlay=lh.thickness:overlay_threshold=0.1,3 --viewport 3d  Want to know the answer? Click and drag to highlight and reveal the text below.

freeview -v subj_004/surf/lh.pial:overlay=lh.thickness:overlay_threshold=1,2 --viewport 3d

Challenge 3

Difficulty: Beginner

Goal: Practice opening multiple files at a time with FreeView.

 freeview -v 004/mri/wm.mgz:colormap=jet 004/mri/brainmask.mgz -f 004/surf/lh.pial:edgecolor=blue 004/surf/lh.white:edgecolor=red 

Want the solution? Click and drag to highlight and reveal the text below.

freeview -v 004/mri/brainmask.mgz 004/mri/wm.mgz:colormap=jet:opacity=.2 -f 004/surf/lh.pial:edgecolor=blue 004/surf/lh.white:edgecolor=red 004/surf/rh.pial:edgecolor=blue 004/surf/rh.white:edgecolor=red