Each imaging exam was acquired using one of several clinical General Electric MR scanners (GE Healthcare, Milwaukee, Wisconsin), operating at 1.5 T () or 3 T (). For both the 1.5 and 3 T scans, the DSC images were obtained using a spin-echo echo-planar sequence with axial orientation and TR/TE/FA of 2217 to . The matrix was , field of view (FOV) , slice thickness 5 mm, and slice gap 5 mm. 40 successive time points were imaged with between acquisitions. The number of slices ranged from 10 to 26, covering the entire tumor in all cases. For the DSC imaging, 2 ml of gadolinium-based contrast agent were introduced as a preloading bolus to decrease the T1 leakage effects from contrast extravasation through the disrupted blood brain barrier15 during the main bolus of 18 ml. Except for two cases, the T1w postcontrast images were acquired at an oblique axial angle using either spin-echo or fast spin-echo sequences after gadolinium injection. The T1w parameters for the 1.5 T spin-echo sequence were TR/TE/FA of 433 to to . The matrix was , FOV to , slice thickness 4 mm, and no slice gap. For the 1.5 T fast spin-echo sequence, the TR/TE/FA was . The matrix was , FOV , and an echo train length of 8. For the two-dimensional (2-D) 3 T spin-echo acquisitions, the TR/TE/FA was 467 to . The matrix was , FOV , slice thickness 4 mm, and no slice gap. For the three-dimensional 3 T fast spin-echo acquisitions, the TR/TE/FA was to . The matrix was , FOV , and an echo train length of 24. The two nonaxial postcontrast image volumes were 2-D 3 T fast spin-echo acquisitions obtained in the coronal plane, with TR/TE/FA of 600 to to . The matrix was , FOV , slice thickness 4 mm, slice gap 5 mm, and an echo train length of 3.