FIG 3. A–D, Fitted curves of the 
SI time course of a typical low-grade (A, B) and a typical high-grade (C, D) tumor. Dynamic postcontrast values for the reference vascular signal (sagittal sinus) are displayed in A and C, respectively, and for tumor curves in B and D, respectively. The equations are displayed on the graphs. The low-grade tumor (patient 8 in Table 1) has an fBV of 3.2%, k1 + k2 is 5.8, and kPS is 5.5; the high-grade tumor (patient 20 in Table 1) has an fBV of 6.7%, k1 + k2 is 13.7, and kPS is 10.8. Times are defined as the time after contrast administration that the center of k-space (mid-part of 3D acquisition) was attained.
