Fig. 2: Representative MRI images of the different groups of animals.

a T2-weighted images for animals who received 20 Gy conventional radiotherapy (conv. RT). Gy refers to Gray. b T2-weighted images for animals who received 20 Gy mini-GRID radiotherapy (mini-GRID RT) c. T2-weighted images for 25 Gy conventional irradiation. d T2-weighted images for 25 Gy mini-GRID irradiation. Radiation necrosis at 25 Gy is heterogeneous on the T2-weighted images and shows large signal enhancement (red arrows).