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公开(公告)号：US20080002806A1
公开(公告)日：2008-01-03
申请号：US11769424
申请日：2007-06-27
CPC分类号： A61B6/4035 , A61B6/027 , A61B6/032 , G01N23/046 , G01N2223/419 , G06T11/005
摘要： Improvement of the picture quality of tomograms in an X-ray CT apparatus using a multi-row x-ray detector is to be realized. When conventional scanning (axial scanning) or cine-scanning is to be performed in consecutive different scanning positions in the z-axis direction, the width of the X-ray beam at scanning positions at both ends is kept at exactly or approximately D/2 relative to the multi-row x-ray detector. Alternatively, the interval between one scanning position and another is kept at not more than D. Unevenness of picture quality dependent on positions on the z-axis on a reconstructed plane can be improved.
摘要翻译： 要实现使用多行x射线检测器的X射线CT装置中的断层图像的图像质量的提高。 当在z轴方向的连续不同扫描位置进行常规扫描（轴向扫描）或电影扫描时，两端扫描位置处的X射线束的宽度保持在精确或约为D / 2 相对于多行X射线检测器。 或者，一个扫描位置与另一扫描位置之间的间隔保持在不大于D.可以提高依赖于重构平面上的z轴上的位置的图像质量的不均匀性。
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公开(公告)号：US20070036263A1
公开(公告)日：2007-02-15
申请号：US11500634
申请日：2006-08-08
CPC分类号： G01N23/046 , A61B6/032 , A61B6/466 , G01N2223/419 , G01N2223/612
摘要： The present invention is intended to improve the quality of a tomographic image to be produced by an X-ray CT apparatus including an X-ray area detector represented by a multi-array X-ray detector or a flat-panel detector. A conventional (axial) or cine scan is performed on the first and second scanned positions in the direction of a z axis. Projection data items produced by scanning the first scanned position and projection data items produced by scanning the second scanned position are used to reconstruct a tomographic image.
摘要翻译： 本发明旨在提高由包括由多阵列X射线检测器或平板检测器表示的X射线区域检测器的X射线CT装置产生的断层图像的质量。 在z轴的方向上的第一和第二扫描位置执行传统的（轴向）或电影扫描。 通过扫描第一扫描位置产生的投影数据项目和通过扫描第二扫描位置产生的投影数据项目用于重建断层图像。
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公开(公告)号：US20070268996A1
公开(公告)日：2007-11-22
申请号：US11745597
申请日：2007-07-26
申请人： Akira Hagiwara , Masatake Nukui , Akihiko Nishide , Makoto Gohno
发明人： Akira Hagiwara , Masatake Nukui , Akihiko Nishide , Makoto Gohno
CPC分类号： G01N23/046 , A61B6/032 , A61B6/488 , A61B6/5282 , G01N2223/419 , G01N2223/612
摘要： Embodiments of the present invention improve image quality by preventing artifacts from developing. From the projection data obtained by performing a scan for the imaging area of a subject, a tomographic image for a cross-sectional plane of the imaging area is reconstructed. Based on the tomographic image, the density distribution of the imaging area of the subject is then calculated. Thereafter, the scattered radiation beam data is calculated depending on the density distribution, and the projection data is corrected using the scattered radiation beam data. Finally the corrected image is reconstructed based on the corrected projection data.
摘要翻译： 本发明的实施例通过防止伪影显影来提高图像质量。 根据对被摄体的成像区域进行扫描获得的投影数据，重建摄像区域的截面的断层图像。 基于断层图像，然后计算被检体的成像区域的密度分布。 此后，根据密度分布计算散射辐射束数据，并且使用散射辐射束数据校正投影数据。 最后，基于校正的投影数据重建校正图像。
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公开(公告)号：US06445764B1
公开(公告)日：2002-09-03
申请号：US09747545
申请日：2000-12-22
申请人： Makoto Gohno , Masatake Nukui , Tetsuya Horiuchi , Akira Hagiwara
发明人： Makoto Gohno , Masatake Nukui , Tetsuya Horiuchi , Akira Hagiwara
IPC分类号： A61B600
摘要： For the purpose of reconstructing a plurality of X-ray tomographic images having a plurality of practical slice thicknesses while reducing the number of X-ray detector arrays and simplifying configuration, X-rays generated by an X-ray tube 4 are emitted via a slit 15 of a collimator 6 toward a detector 8 disposed opposite to the X-ray tube 4; the length (width) of the collimator 6's slit 15 in the D1 direction and the position of the collimator 6 in the D1 direction are adjustable; the detector 8 is comprised of four X-ray detector arrays; and the widths of the two outer X-ray detector arrays in the D1 direction are larger than the widths of the two center X-ray detector arrays.
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公开(公告)号：US20070211845A1
公开(公告)日：2007-09-13
申请号：US11620665
申请日：2007-01-06
申请人： Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
发明人： Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
摘要： X-ray CT apparatus includes an x-ray data collecting device for collecting x-ray projection data transmitted by a subject positioned between an x-ray generating device and a multi-row x-ray detector, while rotating said x-ray generating device and said multi-row x-ray detector around a rotation center positioned in-between, an image reconstructing device for performing image reconstruction from the projection data collected from the x-ray data collecting device, an image display device for displaying a tomogram obtained by image reconstruction, and a scanning condition setting device for setting various scanning conditions of tomography scanning. The x-ray data collecting device is operable for variable-pitch helical scanning which x-ray projection data of the subject on a scanning table is collected by moving the scanning table while varying the speed relative to a scanning gantry in a z direction perendicular to an xy plane which is the rotating plane of the x-ray generating device and the two-dimensional x-ray area detector, and of which starting of the x-ray data collection and starting of the scanning table movement relative to the scanning gantry and/or stopping of the x-ray data collection and stopping of the scanning table movement relative to the scanning gantry are asynchronously executed.
摘要翻译： X射线CT装置包括：x射线数据采集装置，用于收集位于X射线产生装置和多列x射线检测器之间的被摄体发射的X射线投影数据，同时旋转所述x射线产生装置 以及围绕位于其间的旋转中心的所述多行X射线检测器，用于根据从X射线数据采集装置收集的投影数据进行图像重建的图像重建装置，用于显示由 图像重建以及用于设置断层摄影扫描的各种扫描条件的扫描条件设定装置。 X射线数据采集装置可操作用于可变间距螺旋扫描，其中通过移动扫描台来收集扫描台上的被摄体的X射线投影数据，同时相对于扫描台架以相对于扫描台架的方向相对于 xy平面，其是x射线产生装置和二维x射线区域检测器的旋转平面，并且其中X射线数据收集的开始和扫描台移动相对于扫描台架和/ 或停止X射线数据收集，并且相对于扫描台架停止扫描台移动是异步执行的。
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公开(公告)号：US20070098241A1
公开(公告)日：2007-05-03
申请号：US11552656
申请日：2006-10-25
申请人： Xueli Wang , Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
发明人： Xueli Wang , Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
IPC分类号： G06K9/00
CPC分类号： G06T11/008 , A61B6/027
摘要： The present invention is intended to improve the quality of a three-dimensional display image, an MPR display image, or an MIP display image presented by an X-ray CT system that performs a conventional (axial) scan, a cine scan, or a helical scan. The X-ray CT system includes an image reconstruction unit or an image display unit. The image reconstruction unit or image display unit measures deviations of tomographic images in an x direction that is a horizontal direction and deviations thereof in a y direction that is a vertical direction according to the continuity in a z direction of an object that exhibits high CT numbers and that is visualized as a reference in the tomographic images; such as, a cradle, a head holder, the surface of a subject's body, or a bone. The image reconstruction unit or image display unit then compensates the deviations.
摘要翻译： 本发明旨在提高由执行常规（轴向）扫描，电影扫描或电视扫描的X射线CT系统呈现的三维显示图像，MPR显示图像或MIP显示图像的质量。 螺旋扫描。 X射线CT系统包括图像重建单元或图像显示单元。 图像重建单元或图像显示单元根据呈现高CT数的物体的az方向的连续性来测量作为水平方向的x方向的断层图像和作为垂直方向的y方向的偏离的断层图像的偏差， 在断层图像中可视化为参考; 例如摇篮，头部保持器，被检体的表面或骨骼。 然后，图像重建单元或图像显示单元补偿偏差。
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公开(公告)号：US20060034419A1
公开(公告)日：2006-02-16
申请号：US11199416
申请日：2005-08-08
IPC分类号： A61B6/00
CPC分类号： A61B6/481 , A61B6/027 , A61B6/032 , A61B6/507 , G01N23/046 , G01N2223/419 , G01N2223/612 , G06T11/005
摘要： A scan control method for an X-ray CT apparatus wherein a subject with a contrast agent injected therein is helically scanned with an X-ray beam and image reconstruction is performed based on projection data obtained through an X-ray detector. The method includes controlling a velocity of a helical scan following motion of the contrast agent in the subject.
摘要翻译： 一种X射线CT装置的扫描控制方法，其中用X射线束对其中注射有造影剂的对象进行螺旋扫描，并且基于通过X射线检测器获得的投影数据进行图像重建。 该方法包括控制受试者中造影剂的运动之后的螺旋扫描的速度。
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公开(公告)号：US07978895B2
公开(公告)日：2011-07-12
申请号：US11552656
申请日：2006-10-25
申请人： Xueli Wang , Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
发明人： Xueli Wang , Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
CPC分类号： G06T11/008 , A61B6/027
摘要： The present invention is intended to improve the quality of a three-dimensional display image, an MPR display image, or an MIP display image presented by an X-ray CT system that performs a conventional (axial) scan, a cine scan, or a helical scan. The X-ray CT system includes an image reconstruction unit or an image display unit. The image reconstruction unit or image display unit measures deviations of tomographic images in an x direction that is a horizontal direction and deviations thereof in a y direction that is a vertical direction according to the continuity in a z direction of an object that exhibits high CT numbers and that is visualized as a reference in the tomographic images; such as, a cradle, a head holder, the surface of a subject's body, or a bone. The image reconstruction unit or image display unit then compensates the deviations.
摘要翻译： 本发明旨在提高由执行常规（轴向）扫描，电影扫描或电视扫描的X射线CT系统呈现的三维显示图像，MPR显示图像或MIP显示图像的质量。 螺旋扫描。 X射线CT系统包括图像重建单元或图像显示单元。 图像重建单元或图像显示单元根据呈现高CT数的物体的az方向的连续性来测量作为水平方向的x方向的断层图像和作为垂直方向的y方向的偏离的断层图像的偏差， 在断层图像中可视化为参考; 例如摇篮，头部保持器，被检体的表面或骨骼。 然后，图像重建单元或图像显示单元补偿偏差。
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公开(公告)号：US07639772B2
公开(公告)日：2009-12-29
申请号：US11539343
申请日：2006-10-06
申请人： Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
发明人： Akihiko Nishide , Akira Hagiwara , Kotoko Morikawa
IPC分类号： A61B6/00
CPC分类号： G06T11/005 , A61B6/027
摘要： The slice thickness of tomograms of an X-ray CT apparatus is to be kept as constant as practicable within an xy plane. In projected data before three-dimensional back-projection, after convolving row-directional filter of an X-ray detector whose filter coefficient is adjusted channel by channel, three-dimensional back-projection is performed to achieve image reconstruction thereby to control the slice thickness of tomograms according to the distance from the center of the xy plane. The slice thickness is controlled to keep it as constant as practicable independent of the distance from that center to regulate the picture quality of tomograms. Further, the relative density of distances on the reconstruction plane of X-ray detector data or projection data projected on the reconstruction plane is controlled by creating virtual projection data thereby to improve the picture quality of tomograms.
摘要翻译： X线CT装置的断层图像的切片厚度应在xy平面内尽可能地保持恒定。 在三维反投影之前的投影数据中，在通过滤波器系数逐个调整的X射线检测器的卷积行方向滤波器之后，执行三维反投影以实现图像重建，从而控制切片厚度 根据距离xy平面中心的距离计算断层图像。 控制切片厚度以使其在切实可行的范围内保持恒定，独立于距离该中心的距离以调节断层图像的图像质量。 此外，通过创建虚拟投影数据来控制投影在重建平面上的X射线检测器数据或投影数据的重建平面上的距离的相对密度，从而提高断层图像的图像质量。
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公开(公告)号：US07313216B2
公开(公告)日：2007-12-25
申请号：US11199416
申请日：2005-08-08
IPC分类号： A61B6/03
CPC分类号： A61B6/481 , A61B6/027 , A61B6/032 , A61B6/507 , G01N23/046 , G01N2223/419 , G01N2223/612 , G06T11/005
摘要： A scan control method for an X-ray CT apparatus wherein a subject with a contrast agent injected therein is helically scanned with an X-ray beam and image reconstruction is performed based on projection data obtained through an X-ray detector. The method includes controlling a velocity of a helical scan following motion of the contrast agent in the subject.
摘要翻译： 一种X射线CT装置的扫描控制方法，其中用X射线束对其中注射有造影剂的对象进行螺旋扫描，并且基于通过X射线检测器获得的投影数据进行图像重建。 该方法包括控制受试者中造影剂的运动之后的螺旋扫描的速度。
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