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:
Jun. 16, 1987
Filed:
Jul. 02, 1985
Hiroshi Asahina, Tochigi, JP;
Ichiro Ogura, Ootawara, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An X-ray photographing device of a digital fluorographic apparatus for use in X-ray diagnosis includes an image intensifier for converting X-rays transmitted through an object to an optical image, and a TV camera for converting the optical image to a television video signal. An effective video level range of the TV camera is narrower than that of the image intensifier. In order to perform a proper X-ray transmittance correction for the object, an X-ray television video signal is converted, at levels out of the effective video level range of the TV camera, to a maximum allowable input video level. In a TV monitor, the levels of the television signal which are out of the effective video signal level range of the TV camera are displayed at the maximum signal level to permit a ready transmittance correction operation. The subtraction image is displayed in accordance with the proper corrected levels.