candidate: It is a versatile platform which can be used for all forms of advanced radiotherapy modalities including Image Guided Radiotherapy ( IGRT ) and Image Guided Radiosurgery ( IGRS ) , Intensity - Modulated Radiotherapy ( IMRT ) , Volumetric Intensity Modulated Arc Therapy ( Rapid Arc ) and Stereotactic Body Radiotherapy ( SBRT ) along with conventional and 3 - D conformal radiotherapy .