The gray-white contrast in spin-echo imaging at 7 T

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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