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Treatment plan of brain metastasis by volumetric-modulated arc therapy (VMAT). a Axial: T1-weighted Magnetic resonance imaging (MRI) with gadolinium (Gd) before stereotactic radiotherapy (SRT). Gross tumor volume (GTV) was defined as the abnormality on the T1-weighted MRI with Gd. Planning target volume was generated by adding a 1-mm margin from GTV. b Axial coplanar and two non-coplanar arcs of VMAT. c Axial, Sagittal, Coronal: Dose distribution of SRT using VMAT
