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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Yisheng Xu
December 28, 2009 11:19AM
The smoothing result looks pretty good and the measured smoothness by 3dFWHMx is very close to specified parameters for single image smoothing using 3dBlurToFWHM.

A remaining problem is 3dBlurToFWHM can only specify a uniform target smoothness (FHWM) or a target smoothness for the RMS of x and y only (FHWMxy). PET images usually have relative smaller in-plane smoothness (8-10 mm after coregistration and normalization) than z-direction (12-13 mm). Is there any way to control the target smoothness of x, y and z separatly? I'm currently using a imperfect workaround as following, but z-smoothness is not well controlled and x-y cannot be controlled separately:

3dBlurToFWHM -input wpet+orig -prefix wpet_sm1 -mask wpmask.nii -FWHM 14 -maxite 15
3dBlurToFWHM -input wpet_sm1+orig -prefix wpet_sm2 -mask wpmask.nii -FWHMxy 12

Thanks,
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Subject Author Posted

3dBlurToFWHM for PET images?

Yisheng Xu December 24, 2009 11:44AM

Re: 3dBlurToFWHM for PET images?

Yisheng Xu December 24, 2009 12:04PM

Re: 3dBlurToFWHM for PET images?

bob cox December 24, 2009 02:44PM

Re: 3dBlurToFWHM for PET images?

Yisheng Xu December 28, 2009 11:19AM