AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Daniel Glen
March 21, 2006 02:17PM
It's hard to say what you might mean by x, y, z here, but AFNI does keep a storage order in x,y and z. You can use 3dinfo to show the orientation
...
Data Axes Orientation:
first (x) = Right-to-Left
second (y) = Anterior-to-Posterior
third (z) = Inferior-to-Superior [-orient RAI]
R-to-L extent: -123.629 [R] -to- 115.434 [L] -step- 0.938 mm [256 voxels]
A-to-P extent: -145.970 [A] -to- 93.092 [P] -step- 0.938 mm [256 voxels]
I-to-S extent: -42.147 -to- 61.853 [S] -step- 2.600 mm [ 41 voxels ]
...

Here the definition of x,y,z is fairly clear. X goes from right to left, Y is anterior to posterior, and Z is inferior to superior. All go from negative to positive depending where the 0,0,0 is set. The orient code is set to the first letters of each of the starting directions, i.e. RAI.
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Subject Author Posted

Coordinates in 3dvolreg

Alexandre Franco March 21, 2006 01:48PM

Re: Coordinates in 3dvolreg

Daniel Glen March 21, 2006 02:17PM