Hi Ali,

do you want to send us a sample of the data. It's very hard to get anything like uniform contrast over the whole brain at 7T due to dielectric effects. We rarely use the 7T for this kind of thing as in our experience the 3T is better (in contrast to say T2* weighting, which is beautiful at 7T).

cheers, Bruce On Thu, 22 Jan 2009, Al-Radaideh Ali wrote:

Dear FreeSurfer experts,

I did contact you before regarding the problem below ( Talairach Failure Detection ) and one suggestion was to use lower resolution MPRAGE rather than using .5mm one. ( Our MPRAGEs were acquired at 7T scanner with 0.5mm isotropic resolution). I acquired a new MPRAGE at 7T scanner with 0.8mm isotropic resolution but unfortunately it failed again.

( Note, regarding the inhomogeniety, I used SPM5 for normalization. Furthermore, I tried also using flag '-notal-check' once but did not work)

Any other suggestions I can try, Please?

Thu Jan 22 11:22:45 GMT 2009 talairach_avi done cp transforms/talairach.auto.xfm transforms/talairach.xfm #-------------------------------------------- #@# Talairach Failure Detection Thu Jan 22 11:22:46 GMT 2009 /data_local/ali/freesurfer/subjects/low2n/low2n/mri talairach_afd -T 0.005 -xfm transforms/talairach.xfm ERROR: talairach_afd: Talairach Transform: transforms/talairach.xfm ***FAILED*** (p=0.0000, pval=0.0000 < threshold=0.0050) Linux comp03 2.6.11.4-21.11-smp #1 SMP Thu Feb 2 20:54:26 GMT 2006 x86_64 x86_64 x86_64 GNU/Linux recon-all exited with ERRORS at Thu Jan 22 11:22:46 GMT 2009

Many thanks in advance

Ali

This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.