|
FIG 1. Double-exponential diffusional signal-intensity decays. Plot shows 1) the mean ± 1 SD (error bars) of Sb/S0 at b = 100–3300 s/mm2 in the centrum semiovale in six healthy volunteers and 2) the approximation to the double-exponential model according to the nonlinear least-squares Marquardt–Levenberg algorithm (line) plotted on a logarithmic scale. Also shown are b-value ranges for fast (A) and slow (B) DTI in patients 3–6.
|