X-ray primary radiation diaphragm assembly

US4128767A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Lars Stodberg · Stenhamra, SE
• Hans Sjostrom · Spånga, SE

Key dates

• Filing date: May 6, 1977
• Grant date: Dec 5, 1978
• Expiry date: May 6, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G21K1/04
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In the illustrated embodiment sets of four diaphragm plates are utilized to define the margins of a beam path configuration having the shape of a four-sided pyramid with its vertex coinciding with the focus of the x-ray tube. Each set of four diaphragm plates is mounted by means of levers which are capable of being pivoted in a scissors-like fashion so as to adjust the angle of divergence of the x-ray beam with respect to a given plane. For actuating the levers, a motor driven cam is coupled with the levers via a roller and a pair of links, a tension spring urging the levers in a direction so as to press the roller into following relation to the cam surface.