Luminescent storage screen and read-out apparatus therefor

US4950907A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventor

• Herbert Kuhn · Prüm, DE

Key dates

• Filing date: Apr 3, 1989
• Grant date: Aug 21, 1990
• Expiry date: Apr 3, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G01T1/2014
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A luminescent storage screen of the type used to latently store an x-ray image in an x-ray diagnostics installation has two phosphor layers separated by and carried on a carrier disposed therebetween. The carrier is substantially transparent to x-radiation, so that the x-ray image is stored in both phosphor layers. A read-out apparatus for the storage screen includes a read-out beam generator which generates a single read-out beam which is directed at one side of the storage screen. The carrier is transmissive to the read-out beam, but is impermeable to light emitted by the phosphor layers, so that the light emitted by each phosphor layer during simultaneous read-out can be separately collected and detected. The single read-out beam simultaneously scans both phosphor layers, so that the resulting images are automatically correlated. The images are then combined in a known manner to form a single, displayed image.