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21. 发明专利

JP2007130278A X-ray ct apparatus 审中-公开
标题翻译： X射线CT装置
公开(公告)号：JP2007130278A
公开(公告)日：2007-05-31
申请号：JP2005326946
申请日：2005-11-11
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NISHIDE AKIHIKO
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To achieve a reduction of radiation exposure and improvement in image quality of conventional scan (axial scan), cine scan, helical scan, or variable pitch helical scan by an X-ray CT apparatus with a two-dimensional X-ray area detector of a matrix arrangement represented by a multi-array X-ray detector or a flat panel X-ray detector. SOLUTION: The X-ray CT apparatus with the two-dimensional X-ray area detector of the matrix arrangement represented by the multi-array X-ray detector or the flat panel X-ray detector has an image reconstruction means for performing image reconstruction while taking account of misalignment between the center line in the direction of a channel of the two-dimensional X-ray area detector and a rotatry plane and achieves the reduction of the radiation exposure and optimization of the image quality of the conventional scan (the axial scan), the cine scan, the helical scan, or the variable pitch helical scan without performing alignment of a data collection system comprising an X-ray tube, an X-ray collimator, and the two-dimensional X-ray area detector. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了实现常规扫描（轴向扫描），电影扫描，螺旋扫描或可变间距螺旋扫描的放射线暴露的降低以及具有二维扫描的X射线CT装置的可变螺距扫描，由多阵列X射线检测器或平板X射线检测器表示的矩阵布置的二维X射线区域检测器。解决方案：具有由多阵列X射线检测器或平板X射线检测器表示的矩阵布置的二维X射线区域检测器的X射线CT装置具有图像重建装置，用于执行考虑到二维X射线区域检测器的通道的方向上的中心线与旋转平面之间的未对准的图像重建，并且实现了辐射曝光的减少和传统扫描的图像质量的优化（轴扫描），电影扫描，螺旋扫描或可变螺距螺旋扫描，而不执行包括X射线管，X射线准直器和二维X射线区域检测器的数据收集系统的对准。版权所有（C）2007，JPO＆INPIT

22. 发明专利

JP2007089673A X-ray ct apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：JP2007089673A
公开(公告)日：2007-04-12
申请号：JP2005280512
申请日：2005-09-27
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NISHIDE AKIHIKO , HAGIWARA AKIRA , IMAI YASUHIRO , GONO MAKOTO
IPC分类号： A61B6/03
CPC分类号： G01N23/046 , A61B6/027 , A61B6/032 , A61B6/469 , A61B6/583 , G01N2223/419 , G01N2223/612
摘要： PROBLEM TO BE SOLVED: To improve image quality of conventional scan (axial scan), cine scan, or helical scan for an X-ray CT apparatus with a two-dimensional area X-ray detector of a matrix structure typified by a multi-row X-ray detector or a flat panel X-ray detector. SOLUTION: For an image reconstruction of the helical scan using a three-dimensional image reconstruction of the X-ray CT apparatus with the two-dimensional area X-ray detector of the matrix structure typified by the multi-row X-ray detector or the flat panel X-ray detector, there are a method of overlapping a z-direction filter on projection data in the direction of the detector row (z-direction) and a method of overlapping the filter on a tomogram space in the z-direction to reconstruct the image with a slice thickness thicker than a width of one row of the multi-row X-ray detector. The image reconstruction of the tomogram of good image quality is acquired at a high speed by optimizing two methods from the viewpoint of computing time and the image quality of the tomogram. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了提高具有矩阵结构的二维区域X射线检测器的X射线CT装置的常规扫描（轴向扫描），电影扫描或螺旋扫描的图像质量，其以多行X射线检测器或平板X射线检测器。
解决方案：对于使用X射线CT装置的三维图像重建的螺旋扫描的图像重建，其具有以多行X射线为代表的矩阵结构的二维区域X射线检测器检测器或平板X射线检测器，存在在z检测器行（z方向）的投影数据上重叠z方向滤波器的方法，以及将滤波器重叠在z的断层图像空间上的方法方向重建具有比多行X射线检测器的一行的宽度更厚的切片厚度的图像。通过从计算时间和断层图像的图像质量的角度优化两种方法，以高速度获取良好图像质量的断层图像的图像重构。版权所有（C）2007，JPO＆INPIT

23. 发明专利

JP2007044207A Radiation ct imaging method and x-ray ct apparatus 审中-公开
标题翻译：辐射CT成像方法和X射线CT装置
公开(公告)号：JP2007044207A
公开(公告)日：2007-02-22
申请号：JP2005231062
申请日：2005-08-09
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NISHIDE AKIHIKO , HAGIWARA AKIRA , MORIKAWA KOTOKO , NUKUI MASAYASU
IPC分类号： A61B6/03
CPC分类号： G01N23/046 , A61B6/032 , A61B6/466 , G01N2223/419 , G01N2223/612
摘要： PROBLEM TO BE SOLVED: To improve image quality of a tomographic image of an X-ray CT apparatus by an X-ray area detector represented by a multiarray X-ray detector or a flat panel. SOLUTION: In the radiation CT imaging method, conventional scanning (axial scanning) or cine scanning is performed at a first scanning position z1 and a second scanning position z2 in the z-axis direction, and the image reconstruction of the tomographic image is carried out by utilizing projection data Dr-z1 acquired at the first scanning position z1 and projection data Dr-z2 acquired at the second scanning position z2. Consequently, the image quality of the tomographic image of a boundary part or an overlapping part of X-ray beams when scanning different positions in the z-axis direction is improved, and the uniform image quality in the z-axis direction is acquired independently of coordinates in the z-axis direction on the reconstruction plane. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：通过由多阵列X射线检测器或平板表示的X射线区域检测器来提高X射线CT装置的断层图像的图像质量。解决方案：在辐射CT成像方法中，在z轴方向上的第一扫描位置z1和第二扫描位置z2执行常规扫描（轴向扫描）或电影扫描，并且断层图像的图像重建通过利用在第一扫描位置z1处获取的投影数据Dr-z1和在第二扫描位置z2处获取的投影数据Dr-z2来执行。因此，提高了扫描z轴方向上的不同位置时的边界部分或X射线束的重叠部分的断层图像的图像质量，并且独立于z轴方向获得均匀的z轴方向图像质量重建平面上z轴方向的坐标。版权所有（C）2007，JPO＆INPIT

24. 发明专利

JP2006051233A Collimator control method and x-ray ct apparatus 审中-公开
标题翻译： COLLIMATOR控制方法和X射线CT装置
公开(公告)号：JP2006051233A
公开(公告)日：2006-02-23
申请号：JP2004235899
申请日：2004-08-13
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NISHIDE AKIHIKO , NUKUI MASAYASU , ATSU KATSUMI
IPC分类号： A61B6/03
CPC分类号： A61B6/06 , A61B6/027 , A61B6/4085 , A61B6/542
摘要： PROBLEM TO BE SOLVED: To provide a collimator control method which reduces patient exposure at the time of helical scanning and an X-ray CT apparatus which executes such collimator control.
SOLUTION: Corresponding to a position on a body axis in the advancing process of the helical scanning, the opening of a collimator is changed. At a helical scanning start position, the opening of the collimator is turned to the state that the front half in the advancing direction of the helical scanning is opened and the rear half is closed. In the middle of the helical scanning, the opening of the collimator is turned to the state that the front half and the rear half in the advancing direction of the helical scanning are both opened. At a helical scanning end position, the opening of the collimator is turned to the state that the front half in the advancing direction of the helical scanning is closed and the rear half is opened.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种在螺旋扫描时减少患者暴露的准直器控制方法和执行这种准直器控制的X射线CT装置。解决方案：在螺旋扫描的前进过程中对应于身体轴线上的位置，准直仪的打开被改变。在螺旋扫描开始位置，准直仪的开口转动到螺旋扫描的前进方向上的前半部分被打开，后半部分闭合的状态。在螺旋扫描的中间，准直器的开口转动到螺旋扫描的前进方向上的前半部和后半部都被打开的状态。在螺旋扫描结束位置，准直仪的开口转动到螺旋扫描的前进方向上的前半部分闭合并且后半部分打开的状态。版权所有（C）2006，JPO＆NCIPI

25. 发明专利

JP2006034865A Image reconstruction method and x-ray ct apparatus 有权
标题翻译：图像重建方法和X射线CT设备
公开(公告)号：JP2006034865A
公开(公告)日：2006-02-09
申请号：JP2004223021
申请日：2004-07-30
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： GONO MAKOTO , HAGIWARA AKIRA , NISHIDE AKIHIKO
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To acquire a CT image of a desired cross section even if internal organs of a subject carry out position slippage by inertia according to acceleration or deceleration of table transfer at the time of a helical scan.
SOLUTION: Image reconstruction is carried out by rectifying a reconstruction aspect P to a reconstruction plane R according to position slippage by the inertia of the internal organs I of the subject H which rides on a cradle 12 which carries out straight line transfer at the time of the helical scan. According to this invention, the CT image of the desired cross section can be acquired even if the internal organs of the subject carry out the position slippage by the inertia.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：即使对象的内部器官根据螺旋扫描时的表格转移的加速度或减速度，通过惯性执行位置滑动来获取期望横截面的CT图像。解决方案：通过根据在对象H的内部器官I的惯性进行直线传送的座椅12上的惯性的位置滑动将重建方面P整改为重构平面R来执行图像重建螺旋扫描的时间。根据本发明，即使对象的内脏通过惯性来执行位置滑移，也可以获得期望横截面的CT图像。版权所有（C）2006，JPO＆NCIPI

26. 发明专利

JP2005334431A Radiation tomograph, radiation tomography and detector element displacement distance measuring instrument 有权
标题翻译：辐射测图，辐射测量和探测器元件位移距离测量仪器
公开(公告)号：JP2005334431A
公开(公告)日：2005-12-08
申请号：JP2004159401
申请日：2004-05-28
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NISHIDE AKIHIKO
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To improve the image quality of a tomogram by preventing the generation of artifact of the tomogram due to displacement of detector elements. SOLUTION: An X-ray tube irradiates X rays on a subject, and the detector elements disposed on the detector surface of a multirow X-ray detector or an area X-ray detector detect the X-rays transmitting through the reconstruction region P and output projection data. A displacement correction means corrects the projection data by the respective detector elements of the X-ray detector based on the premeasured and prestored displacement distances of the detector elements. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：通过防止由于检测器元件的位移而产生断层图像的伪影来提高断层图像的图像质量。解决方案：X射线管对被检体照射X射线，并且设置在多重X射线检测器或区域X射线检测器的检测器表面上的检测器元件检测通过重建区域传输的X射线 P和输出投影数据。位移校正装置基于检测器元件的预先测量的和预先存储的位移距离来校正X射线检测器的各个检测器元件的投影数据。版权所有（C）2006，JPO＆NCIPI

27. 发明专利

JP2005192803A X-ray ct apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：JP2005192803A
公开(公告)日：2005-07-21
申请号：JP2004002181
申请日：2004-01-07
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： MORIKAWA KOTOKO , HAGIWARA AKIRA , NISHIDE AKIHIKO
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus with large flexibility in positioning a reorganized image. SOLUTION: The X-ray CT apparatus comprises a scanning position setting means, a reorganization region setting means for setting a reorganization region independently from the setting of the scanning position, a scanning means for collecting projection data D0 on the scanning position, a face projection data calculating means for calculating data D1 face-projected on the projection surface based on the projection data D0, an inverted projection pixel data calculation means for calculating inverted projection pixel data D2 of each pixel constituting a plurality of lines on the reorganization region by projecting the data D1 face-projected on the pixels constituting the plurality of lines parallel to the projection surface in the direction of X ray transmission, and an inverted projection data calculation means for calculating projection data D3 by adding the inverted projection pixel data D2 of the whole view used in the reorganization of images to the pixel correspondence. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种在重新组织的图像定位方面具有大的灵活性的X射线CT装置。解决方案：X射线CT装置包括扫描位置设置装置，用于独立于设置扫描位置设置重组区域的重组区域设置装置，用于在扫描位置收集投影数据D0的扫描装置，一个面投影数据计算装置，用于基于投影数据D0计算面投影在投影表面上的数据D1;反相投影像素数据计算装置，用于计算在重组区域上构成多个行的每个像素的反相投影像素数据D2 通过将构成与X射线透射方向上的投影面平行的多条线的像素投影的数据D1投影到投影数据计算装置，以及反相投影数据计算装置，用于通过将投影数据D3的反相投影像素数据D2 整个视图用于重组图像到像素对应。版权所有（C）2005，JPO＆NCIPI

28. 发明专利

JP2004195050A Reprojection method, image making method, and image processing device 有权
标题翻译：再现方法，图像制作方法和图像处理装置
公开(公告)号：JP2004195050A
公开(公告)日：2004-07-15
申请号：JP2002369384
申请日：2002-12-20
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NISHIDE AKIHIKO , MORIKAWA KOTOKO
IPC分类号： A61B6/03 , G06T1/00 , G06T3/40
CPC分类号： G06T3/4007
摘要： PROBLEM TO BE SOLVED: To prepare projection data based on an image at high speed. SOLUTION: The density of pixels is increased by the interpolation between pixels of the image. Next, pixels located on a reprojection line P are extracted and the pixel value of the extracted pixels are added up to obtain reprojection data R(θ) corresponding to the reprojection line P. By the method, the projection data can be prepared based on the image at high speed. COPYRIGHT: (C)2004,JPO&NCIPI
摘要翻译：要解决的问题：基于高速图像准备投影数据。解决方案：通过图像像素之间的内插增加像素的密度。接下来，提取位于重投射线P上的像素，并且将所提取的像素的像素值相加，以获得与重投影线P对应的重投影数据R（θ）。通过该方法，可以基于高速图像版权所有（C）2004，JPO＆NCIPI

29. 发明专利

JP2004121706A Data correcting method, and x-ray ct apparatus 有权
标题翻译：数据校正方法和X射线CT设备
公开(公告)号：JP2004121706A
公开(公告)日：2004-04-22
申请号：JP2002293188
申请日：2002-10-07
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NISHIDE AKIHIKO , NUKUI MASAYASU , KUMAZAKI MASAYA , KAWACHI NAOYUKI , MORIKAWA KOTOKO
IPC分类号： A61B6/03 , G06T1/00 , G06T5/20
摘要： PROBLEM TO BE SOLVED: To perform crosstalk correction and X-ray blur correction concerning data which are collected by using a multi-detector. SOLUTION: Crosstalk correction is performed by calculating by superimposition the two-dimensional crosstalk correction filters Fkq (ch, row) of a channel direction and a detector train direction (S3). X-ray blur correction is performed by calculating by superimposition the two-dimensional X-ray blur correction filters Kkq (ch, row) of the channel direction and the detector train direction (S4). Thus, the influences of a crosstalk and also an X-ray blur are suppressed in the channel direction and the detector train direction. COPYRIGHT: (C)2004,JPO

30. 发明专利

JP2003061949A Region extraction method, region extraction device and x-ray ct apparatus 有权
标题翻译：区域提取方法，区域提取装置和X射线CT装置
公开(公告)号：JP2003061949A
公开(公告)日：2003-03-04
申请号：JP2001254235
申请日：2001-08-24
申请人： Ge Medical Systems Global Technology Co Llc , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー
发明人： NOZAKI KYOKO , NISHIDE AKIHIKO , SATO AKIKO , SHINYA MASAE
IPC分类号： A61B6/03 , G06T1/00 , G06T7/00
摘要： PROBLEM TO BE SOLVED: To omit the operation for manually specifying a region of subcutaneous fat on an image for obtaining a mean CT value of a patient and a standard deviation.
SOLUTION: A region of a fat CT value range determined from general CT value distribution of fat is cut out of an image (S2), the mean CT value (Mean) of the cutout region and the standard deviation (SD) are computed (S3), an upper limit CT threshold u=Mean+k×SD and a lower limit CT threshold d=Mean-k×SD for extracting a fat region are computed (S4), a peritoneum region is specified by an operator (S5), and a region in a CT value range between the upper CT threshold u and the lower CT threshold d is extracted from the peritoneum region and displayed (S6). Thus, the labor for the diagnosis operation for visceral adiposis can be saved.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：省略用于手动指定图像上的皮下脂肪区域以获得患者的平均CT值和标准偏差的操作。解决方案：从图像的一般CT值分布确定脂肪CT值范围的区域（S2），计算切出区域的平均CT值（Mean）和标准偏差（SD）（S3）），计算上限CT阈值u =平均值±k×SD和下限CT阈值d =用于提取脂肪区域的平均值k×SD（S4），操作者指定腹膜区域（S5）并且从腹膜区域提取在CT值上限CT和下CT阈值d之间的区域，并显示（S6）。因此，可以节省用于内脏脂肪沉积的诊断手术的劳动。

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