Patent ID: 7132674
Filing Date: 2006-11-07
Classification: A61N,G21K

Abstract:
1. A collimator for defining a beam of high energy rays which is emitted from a substantially punctiform radiation source and directed onto an object to be treated and adaptable to stereotactic conformation irradiation of tumors, the collimator being designed to scan an irregular object to be treated using the beam defined by a collimator opening, the collimator comprising: means defining a plurality of collimator openings having differing sizes; means for positioning said defining means to select one of said plurality of openings and for displacing said selected opening in any desired direction along a spherical surface shaped path, wherein a control axis of said selected opening remains oriented towards the radiation source, with non-selected collimator openings being shielded from radiation; a drive means cooperating with said positioning means for selecting said selected opening and for displacing said selected opening; and a control communicating with said drive means to command positioning of said defining means and displacement of said selected collimator opening, wherein large collimator openings are used for scanning large portions of a radiation surface of the object to be treated and small collimator openings are used for exact definition at edges of said radiation surface and for treatment of radiation surfaces having irregular contours.