Abstract: A system for isometric irradiation of target tissue from multiple radiation sources includes a structure supporting an oblique array of radiation sources disposed to rotate about an axis (28) coinciding with the longitudinal axis of a patient, such that individual sources describe non-overlapping trajectories on the surface of the patient. The sources are supported by asymmetric source carrier (24) within relatively limited angular region about said axis. The sources are collimated by selectable sets of apertures (31ai-31di) arranged on mutually independently rotatable rings (30a-30d), each such ring selectably capable of alignment with a sub-array (24a-24f) of sources to produce a variety of patterns and dynamic intensity modulations of the radiation flux.

Abstract: Apparatus for accelerating and transporting a charged particle beam. The apparatus has a housing which encases an accelerating structure as well as a magnet system. The accelerating structure accelerates an injected charged particle beam within a first evacuated space and directs the beam into the magnet system which transports it along a bent beam path within a second evacuated space. Both spaces are separate from each other and the magnet system is supported within the housing such that it can be angularly adjusted with respect to the accelerating structure. In a preferred embodiment, the second evacuated spaced is partially defined by magnet poles of the magnet system and filled with helium under a pressure of higher than 10.sup.-2 torr.

Abstract: A method and an apparatus for irradiating a relatively large area with a charged particle beam. In the method, a pencil-like beam is generated and spread along a fan axis perpendicular to the beam axis. The fan axis is rotated around the beam axis so that finally a circular area is irradiated. The apparatus includes means for generating a pencil-like beam, a lens system for spreading the beam along the fan axis and means to rotate the fan axis around the beam axis. In a preferred embodiment, the beam is spread such that its transverse intensity distribution increases with increasing distance from the beam center so that the area swept by the beam is irradiated with an even intensity.