Siemens Aktiengesellschaft

Dieter Schmettow

Volker Lehmann

Guenter Ries

A stray radiation grid for penetrating radiation is produced by starting with a carrier material and producing holes in a first surface thereof, and subsequently filling the holes with penetrating radiation absorbing material. A second, opposite surface of the carrier block is etched away to reduce the thickness of the carrier block, leaving a carrier which is flexible and bendable, from which the radiation absorbing material projects as a number of free-standing absorption elements.

Stray radiation grid

A stray radiation grid, particularly for a medical X-ray apparatus, is composed of a carrier material with absorption elements, particularly in the form of lead lamellae, that are arranged in rows spaced from one another and proceeding essentially parallel to one another, with the respective spacings between the successive rows of absorption elements being larger in the region of the edges of the grid than in the middle region.

A magnet system for a nuclear spin tomography installation contains annular superconducting coils for generating a magnetic background field and nonsuperconducting gradient coils. A hollow cylindrical thermal shield fits between the gradient coils and the superconducting coils. According to the invention, the thermal shield at the front faces is formed from tubular end pieces. The front faces have a greater specific electrical resistance than a tubular intermediate piece of the thermal shield that extends between the end pieces and cover at least the area of the gradient coils.

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Erlangen, Germany

Dieter Schmettow