Hyperechogenicity of the substantia nigra in healthy controls is related to MRI changes and to neuronal loss as determined by F-Dopa PET. - Stefanie Behnke; U. Schroeder; U. Dillmann; Hans-Georg Buchholz; Mathias Schreckenberger; G. Fuss; W. Reith; Daniela Berg; Christoph M. Krick (NeuroImage, 2009)