X-ray diagnostic apparatus

US4926454A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Joerg Haendle · Erlangen, DE
• Wolfgang Maass · Nuremberg, DE

Key dates

• Filing date: Jun 12, 1985
• Grant date: May 15, 1990
• Expiry date: Jun 12, 2005

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/43
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

X-ray diagnostic apparatus is disclosed which includes a video camera; at least one image memory (12); one subtraction stage (13) for producing subtraction images by forming the difference from a stored video signal and a video signal chronologically following the stored video signal; an evaluation circuit (14 to 21) for evaluating the time of the difference signal; and a color video monitor (7). The evaluation circuit (14 to 21) contains a time stage (15) and a color converter (14). The color converter (14) is directly coupled to the subtraction stage (13) and converts the subtraction image into a black and white (monochrome) intensity image whose image color is controlled by the time stage (15) in dependence upon the chronological occurrence of the subtraction image. The color converter (14) has one output for each of the primary colors (red, green, blue). One memory (16 to 18) is coupled to each of these outputs for the storing of the output signals of the color converter (14) by summation.