Functional TCD: Comparison with functional magnetic resonance imaging

Both, functional transcranial Doppler ultrasonography (fTCD) and functional magnetic resonance imaging (fMRI)have been employed to assess hemispheric language dominance on 9 healthy subjects. Quantitative language laterality indices of the fTCD and fMRI data have been calculated, representing the de gree and side of hemispheric laterality assessed by each technique. The fTC D results relate Po regional cerebral blood flow changes measured by fMRI i n a highly linear fashion (linear regression analysis, r = 0.97, p < 0.001) . Based on this close agreement both techniques can be used in a complement ary way.