Abstract: A method is disclosed, performed by a management apparatus for a radiotherapy system, the radiotherapy system comprising a source of therapeutic radiation mounted on a rotatable gantry. The method comprises: receiving, from a treatment planning apparatus, a treatment plan for delivery by the radiotherapy system, the treatment plan specifying a plurality of beams to be generated by the source of therapeutic radiation, wherein each beam is associated with first and second angles of the rotatable gantry, wherein the beam is initiated at one of the first and second angles, and terminated at the other of the first and second angles; applying an optimization algorithm to the plurality of beams, the optimization algorithm arranging the plurality of beams into an order such that an aggregate amount of rotation by the rotatable gantry between beams when delivering the treatment plan is minimized; and outputting the ordered plurality of beams to the radiotherapy system for implementation.