254032.fig.001a
(a)
254032.fig.001b
(b)
Figure 1: ROIs superimposed on 25th slice of the DTI-A 6th diffusion direction (a) and on image obtained by the difference of two acquisitions of the same image (b). The red ROI is for the evaluation of signal (for all the methods) and for the evaluation of noise standard deviation in methods 1 and in double image methods 2, 5; the green ROI is for the evaluation of noise in single image methods 3, 4, 6.