Fig. 2From: Proton and helium ion radiotherapy for meningioma tumors: a Monte Carlo-based treatment planning comparisonPlanned dose distributions superimposed on the gray scale X-ray CT images are shown for patient A, featuring in the top panels helium ions (4He) and in the bottom panels protons (1H) for the sagittal (left), coronal (middle) and axial (right) slicesBack to article page