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:
Aug. 01, 1978
Filed:
Feb. 25, 1977
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
In an illustrated embodiment, a detector having a plurality of measuring fields is provided with a computer circuit for the formation of a difference signal which corresponds to the difference between the greatest and the smallest output signal of the measuring fields, a computer circuit for the formation of a sum signal which corresponds to the sum of the greatest and the smallest output signal of the measuring fields, and a division circuit is connected to provide an output as a function of the difference signal divided by the sum signal, as a measure of contrast over the selected measurement surface. The contrast signal can be utilized to control the duration of an exposure. Further, the contrast signal can be used for an automatic adjustment of the x-ray tube high voltage during an exposure so as to achieve an optimum picture contrast.