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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David Soltysik
November 04, 2003 12:16PM
Does the intensity range of the functional image affect volume registration?

I ran two different pulse sequences and used 3dvolreg to do volume registration. However, I noticed that when using a sub-brick acquired with sequence 1 to register runs acquired with sequence 2, I get extreme volume MISregistration. E.g.,

++Min : roll=-0.818 pitch=-5.030 yaw=-2.960 dS=-14.098 dL=-7.707 dP=-3.290
++Mean: roll=+0.927 pitch=-0.735 yaw=+1.410 dS=+3.920 dL=+0.901 dP=+1.105
++Max : roll=+2.857 pitch=+4.216 yaw=+5.208 dS=+26.137 dL=+11.823 dP=+14.314

I also noticed that the run acquired with sequence 1 has a range of 0 to 1200, while the run acquired with sequence 2 has a range of 0 to 12000. I tried to correct for the intensity difference, but it did not help. Is there something I might have overlooked? Thanks.


Dave

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Subject Author Posted

does intensity affect 3dvolreg?

David Soltysik November 04, 2003 12:16PM

Re: does intensity affect 3dvolreg?

bob cox November 04, 2003 01:49PM