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31. 发明授权

US09852526B2 Method and apparatus of resampling and averaging to obtain tilted thick-slice computed tomography images 有权
公开(公告)号：US09852526B2
公开(公告)日：2017-12-26
申请号：US14683999
申请日：2015-04-10
申请人： TOSHIBA MEDICAL SYSTEMS CORPORATION
发明人： Satoru Nakanishi
IPC分类号： G06K9/00 , G06T11/00 , A61B6/03 , A61B6/02 , A61B6/04 , A61B6/00
CPC分类号： G06T11/005 , A61B6/027 , A61B6/032 , A61B6/0407 , A61B6/5205 , A61B6/5223 , G06T11/008 , G06T2211/421 , G06T2211/424
摘要： An apparatus and method for obtaining a thick-slice image from tilted thin-slice computed-tomography (CT) projection data. Tilted CT projection data is obtained for a series of projection planes, wherein the projection planes are parallel for all scans, and the translation direction between CT scans is not orthogonal to the projection planes (i.e., the projection planes are tilted relative to the translation direction between CT scans). Thin-slice images are reconstructed from the respective CT scans, and then grouped into thick-slice groupings. An offset results among the thin-slice images within a thick-slice grouping due to the tilt of the projection planes. This offset is compensated by interpolating and resampling the thin-slice images onto non-offset pixel grids. The interpolated and resampled thin-slice images are then averaged pixel-by-pixel to obtain thick-slice images having the same tilt angle as the thin-slice images.

32. 发明授权

US09704223B2 Method and system for substantially reducing cone beam artifacts based upon adaptive scaling factor in circular computer tomography (CT) 有权
公开(公告)号：US09704223B2
公开(公告)日：2017-07-11
申请号：US14300668
申请日：2014-06-10
申请人： TOSHIBA MEDICAL SYSTEMS CORPORATION
发明人： Satoru Nakanishi , Alexander Zamyatin , Be-Shan Chiang
IPC分类号： G06K9/00 , G06T5/00 , A61B6/03 , A61B6/00 , G06T11/00
CPC分类号： G06T5/001 , A61B6/032 , A61B6/4085 , A61B6/5282 , G06T5/002 , G06T11/005 , G06T2207/10081 , G06T2211/416
摘要： Cone beam artifacts arise in circular CT reconstruction. The cone beam artifacts are substantially removed by reconstructing a reference image from measured data at circular source trajectory, generating synthetic data by forward projection of the reference image along a pre-determined source trajectory, which supplements the circular source trajectory to a theoretically complete trajectory, reconstructing a correction image from the synthetic data and applying a scaling factor whose value is adaptively determined and optimized based upon the minimization of a predetermined cone beam artifact metric. Ultimately, the cone beam artifact is substantially reduced by generating a corrected image using the reference image and the correction image that has been optimally scaled based upon the adaptively determined scaling factor value.

33. 发明授权

US09521981B2 X-ray CT system 有权
标题翻译： X光CT系统
公开(公告)号：US09521981B2
公开(公告)日：2016-12-20
申请号：US14240655
申请日：2013-04-11
申请人： TOSHIBA MEDICAL SYSTEMS CORPORATION
发明人： Satoru Nakanishi , Tatsuro Suzuki
IPC分类号： A61B6/03 , A61B6/04 , A61B6/06 , A61B6/00
CPC分类号： A61B6/035 , A61B6/032 , A61B6/0457 , A61B6/06 , A61B6/54
摘要： X-ray CT system is provided that reduces waiting time for shuttle scanning, comprising: top-plate moving unit; rotary moving unit; data acquisition system; and control unit. Top-plate moving unit displaces top plate to reciprocate in a direction from a starting point to an ending point and in the direction from the ending point to the starting point. Rotary moving unit drives X-ray radiator radiating X-rays to revolve around the subject. Data acquisition system detects X-rays passed through the subject and to gather projection data. Controller controls at least top-plate moving unit so that, during a scanning with X-rays, while projection data are gathered with reciprocating movement of top plate between the starting point and the ending point and with X-ray radiator being driven to make revolving movement, the duration required for reciprocation of the top plate movement being an integral multiple of revolution period of the revolving movement of X-ray radiator.
摘要翻译：提供了减少穿梭扫描的等待时间的X射线CT系统，包括：顶板移动单元; 旋转移动单元; 数据采集系统; 和控制单元。顶板移动单元使顶板在从起点到终点以及从终点到起点的方向上往复运动。旋转移动单元驱动X射线辐射器辐射X射线以围绕主体旋转。数据采集系统检测通过主体的X射线并收集投影数据。控制器至少控制顶板移动单元，使得在使用X射线的扫描期间，通过顶板在起始点和终点之间的往复运动而聚集投影数据，并且X射线辐射器被驱动以进行旋转运动时，顶板运动往复运动所需的持续时间是X射线辐射器旋转运动的旋转周期的整数倍。

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