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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felix_navarro
February 02, 2017 10:56AM
Dear all,

I would like to ask for advice on this question:

I have depicted a ROI over a T1w nifti file so the ROI is saved in a nifti file with a head copied from the original T1w volume.

I want to compute some statistics over other nifti volume (ADC volume) using that ROI. In order to project the ROI on that volume and compute the histograms I use a R script.

I use (qform_ADC)^-1 * qform_ROI as transformation matrix from the ijk space of the ROI to the ijk space of the ADC. Is this correct?
("*" means matrix product, "^-1" means matrix inverse)

I tried to label a slice of one ventricle and I look where this region is moved on the ADC, it does not match with that region on
the ADC after this operation.

Any help will be appreciated.

Félix.
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Subject Author Posted

qform transformation

felix_navarro February 02, 2017 10:56AM

Re: qform transformation

Daniel Glen February 02, 2017 12:25PM

Re: qform transformation

felix_navarro February 03, 2017 08:01AM