Patent · US Expired

Computed tomography apparatus

US6324244A · kind A · utility

12Cited by

1References

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	Sep 25, 2000
Grant date	Nov 27, 2001
Priority date	—
Expiry date	Sep 25, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S378/901
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The invention relates to a computed tomography apparatus which includes a radiation source, a detector device and an analog-to-digital converter for converting the detector output signals into digital values. In order to realize a computed tomography apparatus in which the number of binary positions required for the encoding of the signal entering the analog-to-digital converter is reduced while using simple components which operate with a high degree of reliability, use is made of a read-out amplifier (1) which precedes the analog-to-digital converter (10), has a plurality of gain factors and a control system (12) for the relevant gain factor which, when a predetermined limit value of the integrated input signal is reached, automatically selects an appropriate, each time lower gain factor for the step-wise linear approximation of a proportional ratio between the digital values and the square root of the detector output signals.

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