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FSL  February 2007

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Subject:

FLIRT Dimension Switching

From:

"James N. Porter" <[log in to unmask]>

Reply-To:

FSL - FMRIB's Software Library <[log in to unmask]>

Date:

Mon, 19 Feb 2007 12:19:48 -0600

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (29 lines)

Hello-

I've had a problem crop up with FLIRT that I'm a bit confused by. In the 
study I'm running, 19 out of 20 subjects have been run perfectly fine 
through func2highres and highres2standard. However, for one subject, it 
has attempted to register hires2standard along the wrong directions. The 
axial is being registered to the saggital and vice versa. The coronal is 
being registered to the coronal, but the final solution is tipped to one 
side. I've checked all of the original DICOM info that I can think of, 
and all listings of patient orientation, slice acquisition/encoding 
direction, etc is all the same. The only difference is that the 
subject's head was tilted at a bit of an angle during scanning, but 
certainly not to the degree that the coronal is tipped in the FLIRT 
registration solution.

Images are available at
http://www.tc.umn.edu/~norb0062/BAD_highres2standard.jpg
http://www.tc.umn.edu/~norb0062/GOOD_highres2standard.jpg

Do you have any suggestions for manual intervention?

Thanks in advance,

-- 
Jim Porter
TRiCAM Lab Coordinator
Elliott Hall N437
612.624.3892
www.psych.umn.edu/research/tricam 

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