Siemens Aktiengesellschaft

Martin Schaefer

Martin Hoheisel

Hartmut Sklebitz

Heinz Pilz

Omer Aydin

An arrangement includes a processing chamber, a coating platform located in the processing chamber, and a coating device with a coating element located in the processing chamber for coating a metal or ceramic powder. The arrangement also has an exchanging device for exchanging at least one portion of the coating element with another portion of the same coating element or for exchanging the entire coating element with another coating element within the processing chamber when the processing chamber is closed. The exchanging device can include a multiple head, e.g., a pivoting head or revolving head, an exchanging station, and/or a moving device that allows a coating element portion that is to be exchanged to be moved or pushed away. A part of the coating element can also be rolled on a supply roller, and the coating element portion can be exchanged by unrolling the coating element from the supply roller.

Arrangement for coating a powder

A method is for producing and applying an antiscatter grid or collimator to an x-ray or gamma detector having matricially arranged detector elements which form a detector surface with detection regions sensitive to x-radiation and/or gamma radiation and less sensitive intermediate regions. In the method, a basic structure is firstly produced for the antiscatter grid or collimator by way of a rapid prototyping technique, through which transmission channels and intermediate walls of the antiscatter grid or collimator are formed which have at least in a first direction a center-to-center spacing which is equal to or an integral multiple of a center-to-center spacing of the sensitive detection regions of the detector. The intermediate walls are coated with a material which strongly absorbs x-radiation and/or gamma radiation in order to finish the antiscatter grid or collimator. Subsequently, the antiscatter grid or collimator is applied to the detector surface and connected to the detector surface in such a way that at least the intermediate walls running perpendicular to the first direction, or their coating, are situated over the less sensitive intermediate regions of the detector surface. A detector having an antiscatter grid or collimator in which no moir&#xe9; interference occurs can thus be realized in a simple way.

Method for producing and applying an antiscatter grid or collimator to an x-ray or gamma detector

A method is for producing an antiscatter grid or collimator for a radiation type, which is formed from a base body of predeterminable geometry having transmission channels for primary radiation of the radiation type which extend between two opposite surfaces of the base body. In the method, the base body is constructed by use of a rapid prototyping technique by layer-wise solidification of a structural material, which is substantially transmissive to the radiation type, under the action of radiation. Inner surfaces of the base body in the transmission channels are coated with a material, which strongly absorbs the radiation type, up to a layer thickness which suffices to virtually completely absorb incident secondary radiation of the radiation type. The opposite surfaces of the base body are not coated, or are aftertreated in such a way that they do not bear a coating or bear a coating of greatly reduced layer thickness made from the material strongly absorbing the radiation type. The method permits the simple production of an antiscatter grid or collimator with high primary beam transparency.

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Berlin, Germany

Martin Schaefer