Fig. 3

Tumor volume as a function of time after the first diagnostic MRI scan. The time is in days. The circles indicate the tumor volume measured on Gd contrast enhanced MRI of GK patients. Solid lines are the volume variation predicted by the model. The vertical arrows indicate the time of GKSRS. The vertical arrows indicate the time of GKSRS. The error bars of the measured volumes were obtained by calculating the volume of an equivalent sphere with ±1 mm radius of the original volume. a case one, b case two, c case three, d case four, and e case five