Systems, methods, and other embodiments associated with Tomosurgery are
described. One method embodiment includes logically dividing a target
volume into treatment slices to be radiated individually by co-planar
beams. The method embodiment also includes planning a two dimensional
path for moving a shaped isocenter through a treatment slice where the
isocenter is produced by the intersection of the co-planar beams. The
method embodiment also includes planning a three dimensional path for
moving the shaped isocenter through the target volume based, at least in
part, on two dimensional paths. The method provides a signal to control a
radio surgery device to deliver radiation using the coplanar beams to the
target volume based, at least in part, on the three dimensional path.