Measuring instrument for the optical focal spot

US4442539A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Horst Aichinger · Ergolding, DE
• Kurt Franke · Erlangen, DE

Key dates

• Filing date: Jun 1, 1981
• Grant date: Apr 10, 1984
• Expiry date: Jun 1, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01T1/2921
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A pinhole camera forms an image of the optical focal spot of an x-ray tube on a radiation-electrical transducer comprising an intensifier foil and a matrix of photo-sensitive detectors. A processing circuit including an adjustable amplitude selector selects detector output signals for transmission to a video monitor. A calibrated measuring grid can be superimposed on the focal spot image on the monitor.