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:
Apr. 15, 2003
Filed:
Apr. 04, 2000
Hiroko Umazaki, Otawara, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A radiation detector has conversion elements for converting radiation incident from the front side into charges, an electric charge read out elements arranged on the rear side of the conversion elements, the supporting plate of the electric charge read out elements, and a first plate as a main shielding plate arranged on the rear side of the supporting plate. The first plate effectively prevents the leakage radiation or reduces the leakage radiation to the standard value. The first plate, however, generates a large amount of backscattering ray. When the backscattering ray reaches the conversion elements, noise charges are generated to degrade the image quality. A second plate is characteristically inserted between the first plate and the supporting plate. The second plate is designed to have a radiation absorbed dose that is not zero but much littler than that of the first plate. The second plate can sufficiently shield the relatively weak backscattering ray generated by the first plate from the conversion elements. Since the second plate has a small radiation absorbed dose, the second plate itself rarely generates the backscattering ray. The backscattering ray generated by the second plate, therefore, does not reach the conversion elements to generate noise charges and degrade the image quality.