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21. 发明申请

US20060291615A1 X-ray CT apparatus 审中-公开
标题翻译： X射线CT装置
公开(公告)号：US20060291615A1
公开(公告)日：2006-12-28
申请号：US11471198
申请日：2006-06-20
申请人： Akihiko Nishide , Yasuhiro Imai , Akira Hagiwara
发明人： Akihiko Nishide , Yasuhiro Imai , Akira Hagiwara
IPC分类号： A61B6/00 , G01N23/00 , G21K1/12 , H05G1/60
CPC分类号： G06T11/005 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/541
摘要： When an X-ray CT apparatus including a two-dimensional X-ray area detector performs a conventional (axial) scan or a cine scan, a plurality of segments of projection data items detected synchronously with an external signal or a biomedical signal is sampled from projection data items acquired during one scan or a plurality of scans. Projection data items corresponding to those detected during a half scan of rotating an X-ray tube by an angle of 180° plus the angle of a fan beam falling on the detector or during a 360° full scan are used to reconstruct a three-dimensional image. Thus, a three-dimensional tomographic image enjoying a high temporal resolution is displayed. Moreover, successive three-dimensional display images showing states of a subject synchronized with respective phases of the external signal or biomedical signal may be displayed as a four-dimensional image.
摘要翻译：当包括二维X射线区域检测器的X射线CT装置执行常规（轴向）扫描或电影扫描时，与外部信号或生物医学信号同步检测的多个投影数据段被从在一次扫描或多次扫描期间获取的投影数据项。对应于在将X射线管旋转180°的角度的半扫描期间检测到的投影数据项与落在检测器上的风扇角度或360°全扫描期间的投影数据项目被用于重建三维图片。因此，显示享受高时间分辨率的三维断层图像。此外，显示与外部信号或生物医学信号的各个相位同步的被检体的状态的连续的三维显示图像可以被显示为四维图像。

22. 发明授权

US07978895B2 X-ray CT system 有权
标题翻译： X光CT系统
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
IPC分类号： G06K9/00 , A61B5/05 , A61B8/00
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。

23. 发明授权

US07639772B2 Image reconstructing method and X-ray CT apparatus 有权
标题翻译：图像重建方法和X射线CT装置
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。

24. 发明授权

US07379526B2 X-ray CT apparatus and X-ray CT imaging method 失效
标题翻译： X射线CT装置和X线CT成像方法
公开(公告)号：US07379526B2
公开(公告)日：2008-05-27
申请号：US11266534
申请日：2005-11-03
申请人： Akihiko Nishide , Akira Hagiwara
发明人： Akihiko Nishide , Akira Hagiwara
IPC分类号： G01N23/00
CPC分类号： A61B6/032 , A61B6/027 , G01N23/046 , G01N2223/419
摘要： The present invention aims to reduce exposure at a helical scan in an X-ray CT apparatus using an X-ray area detector typified by a multi-row X-ray detector or a flat panel. When the angle of an X-ray cone beam spread in a z direction is assumed to be Acone, a scanning gantry is tilted by Acone/2 to start X-ray irradiation/data acquisition of the helical scan, after which the X-ray irradiation/data acquisition is completed at the number of revolutions corresponding to “integral number n+0.5”.
摘要翻译：本发明的目的是在X射线CT装置的螺旋扫描下，使用以X射线检测器或平板为代表的X射线检测区域进行检测。当假定以az方向扩展的X射线锥形束的角度为Acone时，扫描台架被Acone / 2倾斜以开始X射线照射/数据采集螺旋扫描，之后进行X射线照射 /数据采集以对应于“积分数n + 0.5”的转数完成。

25. 发明授权

US07313216B2 Scan control method and X-ray CT apparatus 失效
标题翻译：扫描控制方法和X射线CT装置
公开(公告)号：US07313216B2
公开(公告)日：2007-12-25
申请号：US11199416
申请日：2005-08-08
申请人： Akihiko Nishide , Kotoko Morikawa , Akira Hagiwara , Yasuhiro Imai
发明人： Akihiko Nishide , Kotoko Morikawa , Akira Hagiwara , Yasuhiro Imai
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。

26. 发明申请

US20070268996A1 RADIATION IMAGING APPARATUS AND RADIATION IMAGING METHOD 审中-公开
标题翻译：辐射成像装置和辐射成像方法
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
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
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。

27. 发明申请

US20070121779A1 IMAGE RECONSTRUCTING METHOD AND X-RAY CT APPARATUS 有权
标题翻译：图像重建方法和X射线CT装置
公开(公告)号：US20070121779A1
公开(公告)日：2007-05-31
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： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
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。

28. 发明申请

US20050123091A1 Three-dimensional backprojection method and apparatus, and X-ray CT apparatus 审中-公开
标题翻译：三维反投影法和装置，以及X射线CT装置
公开(公告)号：US20050123091A1
公开(公告)日：2005-06-09
申请号：US11009751
申请日：2004-12-10
申请人： Akihiko Nishide , Akira Hagiwara
发明人： Akihiko Nishide , Akira Hagiwara
IPC分类号： A61B6/03 , A61B6/00 , G01N23/00 , G06T11/00 , G21K1/12 , H05G1/60
CPC分类号： G06T11/006
摘要： A method for image reconstruction in an X-ray CT apparatus, wherein projection data D0 collected by an axial scan using a multi-row X-ray detector or planar X-ray detector having a plurality of detectors is plane-projected onto a projection plane to determine plane-projected data D1; then the plane-projected data D1 is projected in a direction of X-ray transmission onto pixels constituting a plurality of lines arranged successively in a direction parallel to a projection plane at spacings of a plurality of pixels on a reconstruction field, to determine backprojected pixel data D2 for pixels constituting lines on the reconstruction field for a number of plane-projected data lines that depends upon the angle formed between the plane of the reconstruction field and X-ray beam; and the plurality of lines are interpolated to determine backprojected pixel data D2 for pixels in between the lines on the reconstruction field.
摘要翻译：一种用于X射线CT装置中的图像重建的方法，其中通过使用多行X射线检测器的轴扫描收集的投影数据D 0或具有多个检测器的平面X射线检测器被平面投影到投影平面来确定平面投影数据D 1; 那么将平面投影数据D 1投影到构成在重建场上的多个像素的间隔处在与投影平面平行的方向上连续排列的多个行的像素上的X射线透射的方向上，以确定反投影像素数据D 2，用于针对多个平面投影数据线在重建场上构成行的像素，该平面投影数据线取决于在重建场的平面与X射线束之间形成的角度; 并且内插多条线以确定重建场上的线之间的像素的反投影像素数据D 2。

29. 发明授权

US06795522B2 Backprojection method and X-ray CT apparatus 失效
标题翻译：反投影法和X射线CT装置
公开(公告)号：US06795522B2
公开(公告)日：2004-09-21
申请号：US10370651
申请日：2003-02-20
申请人： Akihiko Nishide , Akira Hagiwara
发明人： Akihiko Nishide , Akira Hagiwara
IPC分类号： G01N23083
CPC分类号： G06T11/005 , G06T2211/421 , Y10S378/901
摘要： For the purpose of providing a backprojection method and an X-ray CT apparatus by which backprojection processing can be simplified and sped up, instead of obtaining backprojection pixel data D2(x, y) directly from projection data D0 (view, ch), axially projected data D1 (view, pt) are obtained from projection data D0 (view, ch) by projecting them onto a straight line, and then backprojection pixel data D2 are obtained from the axially projected data D1.
摘要翻译：为了提供反投影方法和可以简化和加快反投影处理的X射线CT装置的目的，而不是直接从投影数据D0（视图，ch）直接获得反投影像素数据D2（x，y），轴向从投影数据D0（view，ch）通过投影到直线上获得投影数据D1（视图，pt），然后从轴向投影数据D1获得反投影像素数据D2。

30. 发明申请

US20120219199A1 IMAGE PROCESSING APPARATUS, PROGRAM AND IMAGE DIAGNOSTIC APPARATUS 有权
标题翻译：图像处理设备，程序和图像诊断设备
公开(公告)号：US20120219199A1
公开(公告)日：2012-08-30
申请号：US13403093
申请日：2012-02-23
申请人： Akira Hagiwara
发明人： Akira Hagiwara
IPC分类号： G06K9/00
CPC分类号： A61B6/032 , A61B6/037 , A61B6/4417 , A61B6/466 , A61B6/504 , A61B6/5211 , A61B6/5258 , G06T5/003 , G06T2207/10081 , G06T2207/20192
摘要： An image processing apparatus is provided. The image processing apparatus includes an acquiring device configured to acquire a typical pixel value corresponding to a noted region in an image, a calculating device configured to calculated index values of variances in pixel values in the noted region or in both the noted region and a region adjacent to the noted region, a first enhancement degree determination device configured to determine an enhancement degree according to the acquired typical pixel value and each of the calculated index values, and an image processing device configured to perform high-frequency enhancement processing on the noted region, based on the enhancement degree determined by the first enhancement degree determination device.
摘要翻译：提供一种图像处理装置。图像处理装置包括获取装置，其被配置为获取与图像中的所述区域相对应的典型像素值;计算装置，被配置为计算所述区域或所述区域和区域中的像素值中的方差的指标值与所述区域相邻的第一增强度确定装置，被配置为根据所获取的典型像素值和所计算的每个索引值来确定增强度，以及被配置为对所述区域执行高频增强处理的图像处理装置，基于由第一增强度确定装置确定的增强度。

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