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

History of AFNI updates  

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February 23, 2021 12:32PM
As Paul said, the Jacobian determinant is a measurement at each location of the expansion or contraction of the volume in that location. To measure the overall expansion or contraction of the brain, the simplest method that comes to my brain at this second would be to create brain-only masks of the before and after brain volumes, and then add up the volume of these masks.

Jacobian (and other) values can be computed from a warp in AFNI using the 3dNwarpFuncs program.
Subject Author Posted

Jacobian meaning?

mabbasi6 February 22, 2021 12:58PM

Re: Jacobian meaning?

ptaylor February 23, 2021 11:32AM

Re: Jacobian meaning?

mabbasi6 February 23, 2021 01:25PM

Re: Jacobian meaning?

RWCox February 23, 2021 12:32PM

Re: Jacobian meaning?

mabbasi6 February 23, 2021 01:29PM

Re: Jacobian meaning?

RWCox February 24, 2021 02:39PM

Re: Jacobian meaning?

mabbasi6 February 24, 2021 05:41PM