the final objective function value is not a great indicator of failure of the talairaching procedure. it's a better indicator of success. if it is low(<.1), you can be confident it is correct. if it is high, that does not mean it is incorrect, but that you should check it. certain brains (with large ventricles) will have higher final objective functions.
you will have to look at your talairach transforms to be sure they are accurate. use tkregister2 as it shows in the documentation to check/fix it.
thanks, brian
On Tue, 2 Aug 2005, Tracy Wang wrote:
Hi All, It seems that my talairach transforms are still suspect, FOF values falling between the 13-.17 range. I've tried Xiao Han's suggestion to skull strip first, but it the final objective function value is still high. Once the transform is applied on the image in native space, it does look a little blurry and jagged, like the resolution has changed. Any ideas or insight of what the problem may be?
Thanks! Tracy
Tracy Wang Research Assistant Cognitive Neuroscience Laboratory
Washington University Department of Psychology, Campus Box 1125 One Brookings Drive St. Louis MO 63130-4899 314-935-5019 twang@artsci.wustl.edu