Figure 1.

Mean (a) and standard deviation (b) of the susceptibility measured inside the straight sinus at each iteration of the FIT-SWIM algorithm. Different initial values (${\chi }_0$) were set inside the veins. Independent of the choice of starting point, the values tended to converge close to the expected susceptibility of 0.45 ppm. The use of a suitable initial value, based on the a priori knowledge of the susceptibility of the structure-of-interest, reduces the streaking artifacts inside the veins. (c) Susceptibility map of an in vivo data from a healthy volunteer generated using the conventional iterative technique, and (d) susceptibility map of the same data generated using FIT-SWIM. Note the improvement in the susceptibility distribution (identified by white arrows in (e) and (f)), inside the veins of different sizes, in (f) with respect to the conventional iterative SWIM results in (e).