Patent · US Expired

Computer tomograph with a multi-stage charge-integrated read amplifier

US6429718B1 · kind B1 · utility

5Cited by

9References

8Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Josef Lauter · Geilenkirchen, DE
Stefan Schneider · Aachen, DE
Herfried Karl Wieczorek · Aachen, DE

Key dates

Filing date	Dec 22, 1999
Grant date	Aug 6, 2002
Priority date	—
Expiry date	Dec 22, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH04N25/78
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The invention relates to a computer tomograph provided with a charge-integrating read amplifier having a plurality of gain factors for a data acquisition system as well as a control circuit for the gain factor. In order to avoid noise in addition to the shot noise in computer tomographs of this kind and also to avoid degrading of the DQE (Detection Quantum Efficiency), according to the invention it is proposed that the control circuit automatically selects the gain factor in dependence on the expected integrated input signal of the next frame, the expectation being based on the maximum possible relative variation of the integrated input signal between two successive frames.

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