Casing for electromagnetic radiation source and method for eliminating extrafocal electromagnetic radiation
AssigneeGE Medical Systems SA
InventorEdmond Chambron
Life of this patent
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Abstract
A casing for an electromagnetic radiation source includes a window made of a material that is transparent to the radiation emitted by the source and which includes at least one chamber in which a material that is opaque to electromagnetic radiation can move. The chamber is designed such that the material that is opaque to radiation can be introduced from the exterior of the chamber. Inside the chamber, the material that is opaque to radiation surrounds a region for passage of a radiation beam such that the area of the beam passage region varies as a function of the volume of opaque material in the chamber, by virtue of which parasitic extrafocal radiation is eliminated from the beam.
Claims23
Casing for electromagnetic radiation source, comprising a window made of a material which is transparent to the radiation emitted by the source, wherein that the window comprises at least one chamber in which a material that is opaque to electromagnetic radiation can move, this chamber being designed in such a way that the material that is opaque to radiation can be introduced from the exterior of the chamber and that, inside the chamber, this material that is opaque to radiation surrounds a region for passage of a radiation beam in such a way that the area of the beam passage region varies as a function of the volume of opaque material in the chamber, by virtue of which parasitic extrafocal radiation is eliminated from the beam.
Method for eliminating the extrafocal radiation from a beam of electromagnetic radiation emitted by a source, comprising the steps of providing a casing of the electromagnetic radiation source with a window having a chamber and introducing into the chamber the desired quantity of radiation-opaque material to absorb the extrafocal radiation.
Dependencies are inferred from the claim text.