公开(公告)号：US20200015769A1

公开(公告)日：2020-01-16

申请号：US16439748

申请日：2019-06-13

Applicant: Hitachi, Ltd.

Inventor： Shinichi KOJIMA ,  Fumito WATANABE ,  Kazuma YOKOI ,  Fuyuhiko TERAMOTO

IPC: A61B6/00

Abstract: To provide an X-ray CT apparatus capable of correcting a difference of scattered radiation quantities contained in the projection data even in a case where a plurality of detection elements are disposed between collimator plates. The X-ray CT apparatus includes: an X-ray irradiation section for X-ray radiation; an X-ray detector including a plurality of detection elements for detecting the X-ray; a plurality of collimator plates disposed between the X-ray irradiation section and the X-ray detector so as to reduce scattered radiation; a reconstruction portion for reconstructing a tomographic image by using projection data generated based on an output from the X-ray detector; and a correction portion for correcting the projection data by using different correction functions according to the positions of the plural detection elements disposed between the collimator plates.

公开(公告)号：US20170276808A1

公开(公告)日：2017-09-28

申请号：US15518575

申请日：2015-06-18

Applicant: HITACHI, LTD.

Inventor： Isao TAKAHASHI ,  Kazuma YOKOI ,  Eiji MORO ,  Yuichiro UENO ,  Yasutaka KONNO ,  Fumito WATANABE ,  Shinichi KOJIMA

IPC: G01T1/29 ,  H01L31/115 ,  H01L27/146 ,  G01T1/161 ,  G01T1/20

CPC classification number: G01T1/2985 ,  A61B6/032 ,  A61B6/4208 ,  G01T1/161 ,  G01T1/17 ,  G01T1/2018 ,  H01L27/14658 ,  H01L31/115

Abstract: A flat pixel (20) is a single unit composing a radiation detector and is configured so as to be divided into at least four subpixels (21) such that even if a prescribed number of subpixels (21) are removed from each pixel (20) in order of largest effective area, the centroid (51) of the effective area of the entirety of the remaining subpixels (21) is positioned within a similar-shape region (30) having the same centroid (50) as the pixel (20) and having sides of lengths that are half those of the pixel (20).