公开(公告)号：US20150036793A1

公开(公告)日：2015-02-05

申请号：US14450546

申请日：2014-08-04

Applicant: HITACHI, LTD. ,  NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY

Inventor： Toru UMEKAWA ,  Kazuo HIRAMOTO ,  Rika BABA ,  Toshie SASAKI ,  Yoshihiko NAGAMINE ,  Shinichi SHIMIZU ,  Seishin TAKAO ,  Naoki MIYAMOTO ,  Taeko MATSUURA ,  Kikuo UMEGAKI

IPC: A61B6/03 ,  A61B6/00

CPC classification number: A61B6/032 ,  A61B6/5294 ,  A61B6/541 ,  A61N5/1049 ,  A61N5/1081 ,  A61N2005/1061

Abstract: A radiotherapy system acquires an image which is necessary for positioning of a patient for radiation treatment and enables grasping of a positional relationship of a target in a treatment radiation irradiated state, a radiation passing area and a critical organ. An X-ray imaging device is attached to the rotatable support device and configured to apply X-rays to the subject from plural directions while rotating around the subject to perform X-ray imaging. A target recognizing device recognizes a three-dimensional position of the target in the subject from X-ray images acquired by the X-ray imaging device; and CT image generating devices are configured to select, from the X-ray images acquired by the X-ray imaging device, the images in which the position of the target recognized by the recognizing device satisfies the treatment radiation irradiation condition for the motion tracking treatment to perform image reconstruction and generate a cone beam CT image.

Abstract translation: 放射治疗系统获取用于放射治疗的患者的定位所需的图像，并且能够掌握治疗射线照射状态，放射线照射区域和关键器官中的靶的位置关系。 X射线成像装置安装在可旋转的支撑装置上，并被配置为在围绕被摄体旋转的同时从多个方向对被检体施加X射线以进行X射线成像。 目标识别装置从由X射线摄像装置获取的X射线图像识别对象的目标的三维位置; 并且CT图像生成装置被配置为从由X射线成像装置获取的X射线图像中选择由识别装置识别的目标的位置满足用于运动跟踪处理的治疗放射线照射条件的图像 执行图像重建并生成锥形束CT图像。

公开(公告)号：US20220313180A1

公开(公告)日：2022-10-06

申请号：US17642257

申请日：2020-06-04

Applicant: Hitachi, Ltd.

Inventor： Rika BABA

IPC: A61B6/03 ,  G06T11/00

Abstract: Artifacts in a tomographic image of a subject including a cyclically moving object to be treated are reduced. A radiographic imaging device includes: a gantry that is equipped with two sets of radiation sources and detectors which are used in pairs, the gantry rotating the radiation sources and the detectors around a subject; and a reconstruction section that reconstructs a tomographic image of the subject based on multiple projection images generated from output of the detectors. The radiographic imaging device further includes: a phase calculation section; a divide section that divides, on a phase-by-phase basis, first projection image groups of multiple projection images acquired by the first set, and similarly second projection image groups acquired by the second set; and a condition setting section. The reconstruction section reconstructs a tomographic image by use of the first and second projection image groups that are placed in the same phase.

公开(公告)号：US20240070830A1

公开(公告)日：2024-02-29

申请号：US18280282

申请日：2022-01-17

Applicant: Hitachi, Ltd.

Inventor： Masahiro KAGEYAMA ,  Rika BABA ,  Motoki MATSUNO ,  Mitsuhiro YOSHIDA

IPC: G06T5/00 ,  A61B6/00

CPC classification number: G06T5/009 ,  A61B6/5217 ,  A61B6/5258 ,  G06T5/002 ,  G06T2207/10116

Abstract: A radiation image processing apparatus for executing image processing on an image obtained by emitting radiation to an object, executes, in order to improve a contrast of the image, processing of extracting a low-frequency component of an input signal of the image to generate a first signal of the image, processing of dividing the input signal of the image by the first signal of the image to generate a second signal of the image, processing of executing non-linear processing on the second signal of the image to generate a third signal of the image, and processing of outputting an output signal of the image obtained by multiplying the input signal of the image by the third signal of the image.

公开(公告)号：US20170003233A1

公开(公告)日：2017-01-05

申请号：US15114091

申请日：2014-02-26

Applicant: HITACHI, LTD.

Inventor： Akio YONEYAMA ,  Rika BABA ,  Keisuke YAMAKAWA

IPC: G01N23/04 ,  G01N23/20

CPC classification number: G01N23/046 ,  G01N23/04 ,  G01N23/20 ,  G01N2223/056 ,  G01N2223/3306 ,  G01N2223/419 ,  G01N2223/423

Abstract: An object of the present invention is to non-destructively obtain, in an X-ray imaging apparatus, a sectional image of a subject with spatial resolution higher than spatial resolution of an image detector. In the present invention, the image detector is two-dimensionally moved with respect to an incident X-ray for each half (180°) rotation of the subject, and a plurality of image groups (CT data sets) is obtained at different positions of the image detector. An image (sinogram) is synthesized from each image group thus obtained, which image is equal to an image obtained with a detector whose pixel size is smaller than the pixel size constituting the above described image detector. From this synthesized image, a sectional image with high spatial resolution is calculated by reconstruction calculation.

Abstract translation: 本发明的目的是在X射线成像设备中非破坏性地获得具有高于图像检测器的空间分辨率的空间分辨率的被摄体的截面图像。 在本发明中，对于被摄体的每半（180°）旋转，图像检测器相对于入射X射线二维移动，并且在不同位置处获得多个图像组（CT数据集） 图像检测器。 从如此获得的每个图像组合成图像（正弦图），该图像等于其像素尺寸小于构成上述图像检测器的像素尺寸的检测器获得的图像。 从该合成图像，通过重建计算来计算具有高空间分辨率的截面图像。