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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Bruce Swett
November 22, 2005 10:36AM
Hi everyone. I have a fun question for you. I’m working on analyzing continuous arterial spin labeling (CASL), using AFNI, and am almost finished with the processing algorithm, except for one step.

The data is in this form: one volume tagged by secondary coil at the neck (5 second TR); one volume untagged (another 5 seconds, for an effective TR of 10 s.). To use the data, we subtract the tagged volumes (T) from the control (C) volumes after separating with 3d calc into 2 data sets.

Before subtracting the two data sets, we want to interpolate between the T data points (sinc / Fourier interpolation), and match the (interpolated) volume time points with the C data set. In essence, we want to trick AFNI into thinking that we collected the two data sets (T and C) at the same time.

Any ideas how to accomplish this? Thanks.

Bruce Swett
NIDCD
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Subject Author Posted

CASL interpolation

Bruce Swett November 22, 2005 10:36AM

Re: CASL interpolation

bob cox November 22, 2005 01:30PM

Re: CASL interpolation

Bruce Swett November 29, 2005 03:11PM

Re: CASL interpolation

bob cox November 29, 2005 05:03PM