公开(公告)号：US20210106292A1

公开(公告)日：2021-04-15

申请号：US16876185

申请日：2020-05-18

Applicant: Hitachi, Ltd.

Inventor： Shinichi KOJIMA ,  Kazuma YOKOI ,  Isao TAKAHASHI ,  Fumito WATANABE ,  Fuyuhiko TERAMOTO ,  Taiga GOTOU

IPC: A61B6/03 ,  A61B6/00

Abstract: A material decomposition apparatus for performing decomposition of a material in an object. The apparatus includes a data storage section for storing correction data preliminarily generated by decomposing one of three or more materials into the other two materials, a data input section to which radiation data of the object is inputted, the radiation data being divided into a plurality of energy levels, and a decomposition processing section for repeatedly performing two-material decomposition for decomposition of the other two materials of the three or more materials using the radiation data at different energy levels and the correction data to perform decomposition of the inside of the object into the three or more materials.

公开(公告)号：US20210027430A1

公开(公告)日：2021-01-28

申请号：US16897768

申请日：2020-06-10

Applicant: Hitachi, Ltd.

Inventor： Mariko YAMAMOTO ,  Keisuke YAMAKAWA ,  Isao TAKAHASHI ,  Taiga GOTOU ,  Hisashi TAKAHASHI

IPC: G06T5/00 ,  G06T7/00

Abstract: Noise is reduced for a medical image for which noise cannot be quantified by a general-purpose image quality evaluation index. An image processor has a preprocessor that generates input images including an original image and one or more images with reduced noise compared with the original image; and a noise reduction processor outputs an image, which is obtained by reducing noise from the original image based on the input images, by applying a learned network. The learned network used in the noise reduction processor is constructed by performing deep learning using a plurality of learning sets in which one or more of a medical image including noise, a noise-reduced image obtained by performing noise reduction processing on the medical image, and an intermediate image obtained during the noise reduction processing are input images and a correct image is obtained based on the input images an output image.

公开(公告)号：US20200151920A1

公开(公告)日：2020-05-14

申请号：US16666931

申请日：2019-10-29

Applicant: Hitachi, Ltd.

Inventor： Hisashi TAKAHASHI ,  Taiga GOTOU

IPC: G06T11/00 ,  G06T5/00 ,  G06T5/50 ,  A61B6/00 ,  A61B6/03 ,  G06F17/18

Abstract: The present invention provides an image reconstruction apparatus and an image reconstruction method, both of which achieve reduction in a granular noise and a streak-like artifact both contained in a reconstruction image, and a clear structure boundary as well The image reconstruction apparatus configured to generate a reconstruction image includes a noise reduction section that generates a streak reduction image as an image obtained by reducing a streak-like artifact in the reconstruction image, a noise reduction ratio acquisition section that acquires a first noise reduction ratio as a noise reduction ratio to be used for reducing a granular noise while retaining a structure boundary in the reconstruction image, and a second noise reduction ratio as a noise reduction ratio to be used for generating the streak reduction image, and an image addition section that adds an addition image to be generated based on the first noise reduction ratio and the second noise reduction ratio to the streak reduction image.

公开(公告)号：US20200219251A1

公开(公告)日：2020-07-09

申请号：US16628254

申请日：2018-04-09

Applicant: Hitachi, Ltd.

Inventor： Hisashi TAKAHASHI ,  Taiga GOTOU ,  Koichi HIROKAWA

IPC: G06T7/00 ,  G06T5/00 ,  G06T17/10

Abstract: An image is generated where an edge of a structure in a subject is sharpened with reducing streak artifacts, within a short amount of time. X-rays at multiple angles are applied to the subject placed in imaging space, and a distribution of X-rays strength passing through the subject is detected to obtain raw data associated with multiple views. After smoothing the raw data associated with multiple views, image reconstruction is performed to generate a smoothed image of a predetermined region to be imaged in the imaging space. In the smoothed image, more intense sharpening process is applied to pixels in a region of a central part of the subject, than the pixels in a region of a peripheral part of the subject.