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A : Tumor volume (VTumor) is measured from MR image, that is, from maximal perpendicular diameters (radii a and b) of the tumor. Coronal diameter of the tumor is approximated by coronal section images showing tumor tissue (radius c, not shown here). B : Volume of tumor and edema (VTumor + Edema) is measured with same method. The resulting of volume is then approximated using the formula for a spheroid : Volume=4/3×π× abc. Edema Index=(VTumor + Edema)/(VTumor).
