Patent · US Expired

X-Ray diagnostic installation for providing subtraction images

US4503459A · kind A · utility

11Cited by

6References

5Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

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

Key dates

Filing date	Sep 22, 1982
Grant date	Mar 5, 1985
Priority date	—
Expiry date	Sep 22, 2002

Classification

Technology area (CPC H)Electricity
CPC primaryH04N5/3205
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An exemplary embodiment comprises an image intensifier television chain, a subtraction device which has at least one image memory and a difference stage for providing subtraction images through difference formation from the stored video signals and chronologically displaced video signals, and a monitor. There is series connected with the subtraction device a circuit with a high-pass filter characteristic for the purpose of two-dimensional spatial frequency filtering.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.