Patent · US Expired

X-ray generator dose fluctuation suppression

US4796286A · kind A · utility

9Cited by

1References

5Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Rudolf Ochmann · Hamburg, DE
Peter Stege · Hamburg, DE
Robert Zimmermann · Graz, AT

Key dates

Filing date	Jun 25, 1987
Grant date	Jan 3, 1989
Priority date	—
Expiry date	Jun 25, 2007

Classification

Technology area (CPC H)Electricity
CPC primaryH05G1/46
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

In X-ray generators comprising a converter for generating the high-voltage for an X-ray tube, substantial dose fluctuations are liable to occur from one exposure to another of series involving a fixed exposure time due to supply voltage fluctuations or fluctuations in the object absorption. These dose fluctuations are more pronounced as the exposure time is shorter and as the converter frequency is lower. These fluctuations are reduced by terminating a series of exposures each time after the same number of converter alternations when the deviation between the actual value and the reference value of the dose or the dose rate is smaller than a predetermined value.

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