The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 1979
Filed:
Jun. 24, 1977
Burghard Weinkauf, Erlangen, DE;
Gunter Luderer, Eltersdorf, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
In an illustrated embodiment radiation detectors are associated with respective signal processing channels which have components subject to errors which vary in the course of time because of external influences such as temperature and aging effects. Each signal channel is subjected to a calibration cycle by introducing an impulse change in the supply voltage common to the respective detectors. Where xenon detectors are utilized in conjunction with integrators, the variation in detector gas volume and capacitance due to manufacturing tolerances may be compensated by storage of a constant value. Thereafter, calibration cycles may provide for automatic correction of the measurement signals for subsequent errors. A calibrating cycle can take place prior to initiation of a patient radiograph, or between two x-ray flashes during the angular scanning process.