X-ray beam modifying diaphragm and diaphragm device

US8218721B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Rainer Raupach · Heroldsbach, DE
• Bernhard Schmidt · Neunkirchen, DE

Key dates

• Filing date: Sep 30, 2009
• Grant date: Jul 10, 2012
• Expiry date: Sep 13, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G21K1/02
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A diaphragm and diaphragm device for the specific manipulation of x-ray radiation that emanates from an x-ray focus of a CT apparatus and serves for scanning an examination subject, wherein the x-ray focus and the diaphragm arranged relatively near to the focus can be rotated together around a system axis (z-axis), and the diaphragm has movable diaphragm elements that dynamically adjust a diaphragm aperture (and therefore the spatial divergence of the x-rays passing through the diaphragm aperture). The diaphragm elements have a transmission factor for x-ray radiation that is different than zero. With such a diaphragm or diaphragm device the acquisition of the projection data necessary for the reconstruction of an artifact-free image of a region of interest (ROI) is possible with lower radiation exposure of the examination subject.