Patent ID: 7783007

Claim:
An irradiation device to define a beam of high-energy rays proceeding from an essentially punctiform radiation source and directed to an object to be radiation treated or to be treated by stereotactic conformation radiotherapy of tumors, the device comprising: a first iris diaphragm collimator having adjusting elements to provide variable apertures for beam collimation; at least one second iris diaphragm collimator disposed in coaxial alignment with an optical path, wherein leaves of said first and said second collimators iris diaphragms are arranged in a staggered manner and in a rotational sense around an axis, so that the beam limited by the collimators has a cross-section of a polygon, the number of corners of which equals a total number of the leaves of all iris diaphragm collimators, said leaves having adjacent side faces enclosing same angles, wherein adjustment movements of said diaphragm leaves are linearly perpendicular to an angle bisector of side faces engaged in adjacent diaphragm leaves; and a control mechanism to direct, from all sides, the beams limited by said collimators towards the object to be treated, wherein parameters for direction, surface area, intensity and time of irradiation are controlled in such a manner that a three-dimensional dosing profile for radiation application is achieved, said control mechanism being suitable to irradiate an irregular space with many overlaying and adjoining irradiated spaces.