FIG. 1.

In vivo MR images of 9L gliosarcoma, F98 glioma, and Mayo 22 glioblastoma brain tumor models. Post-implantation days were 11 (9L), 10 (F98), and 27 (Mayo 22). cc stands for corpus callosum; hc for hippocampal commissure. The tumor regions are hyperintense on the T₂W and ADC images. The boundaries of T₂W hyperintense tumor regions were manually defined and overlaid on other images. In FA maps, the tumors show high contrasts and various degrees of high-level diffusion anisotropy. In DEC and vector images, the tumor areas exhibit a circular orientation for 9L and F98, or a radial orientation for Mayo 22 tumors, as illustrated by the insert diagrams.