A radiation delivery device comprising a gantry, a multi-leaf collimator coupled to the gantry, a radiation source coupled to the gantry, a support moveable along x, y, and z axes； and a computer processor configured to execute a software program, the software program operable to receive at least one image, generate a radiation therapy treatment plan including a plurality of fractions and a radiation dose for each of the plurality of fractions based on the at least one image, prior to delivering one of the plurality of fractions, determine operational parameters based on the radiation therapy treatment plan, wherein the operational parameters include changing a speed and changing movement of the support in the x, y, or z directions of the support during delivery of the radiation therapy treatment plan； and move the support at varying speeds and varying directions in accordance with the operational parameters.
