The gray-white contrast in spin-echo imaging at 7 T
Robert Trampel 1 , Jochen Schmidt 1 , Laurentius Huber 1 , Andreas Schfer 1 , and Robert Turner 1
Max Planck Institute for Human Cognitive and
Brain Sciences, Leipzig, Germany
Although the contrast between gray and white matter
obtained by spin-echo and turbo spin-echo techniques is
usually referred to as T2-weighted, transverse
relaxation mechanisms contribute hardly at all to the
contrast between those brain tissue types. We found that
gray-white contrast in spin-echo brain images at 7T
arises mainly from proton density and T1 relaxation,
depending on TR. Magnetization transfer has a somewhat
smaller influence, while the influence of T2 variations
in tissue is negligible.
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