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    X-ray CT apparatus
    1.
    发明授权
    X-ray CT apparatus 有权
    X射线CT装置

    公开(公告)号：US07428290B2

    公开(公告)日：2008-09-23

    申请号：US11534126

    申请日：2006-09-21

    申请人： Akihiko Nishide ,  Akira Hagiwara ,  Yasuhiro Imai ,  Makoto Gohno

    发明人： Akihiko Nishide ,  Akira Hagiwara ,  Yasuhiro Imai ,  Makoto Gohno

    IPC分类号： H05G1/60

    CPC分类号： G01N23/046 ,  A61B6/027 ,  A61B6/032 ,  A61B6/469 ,  A61B6/583 ,  G01N2223/419 ,  G01N2223/612

    摘要： The present invention is intended to improve image quality ensured by a conventional (axial) scan, a cine scan, or a helical scan performed by an X-ray CT apparatus including a two-dimensional area X-ray detector that has a matrix structure. In helical scan image reconstruction based in three-dimensional image reconstruction performed in an X-ray CT apparatus including a two-dimensional area X-ray detector that is represented by a multi-array X-ray detector or a flat-panel X-ray detector and that has a matrix structure, an image expressing a slice thickness larger than the width of one detector array included in a multi-array X-ray detector is reconstructed according to either of a method of convoluting a z-direction filter to projection data items in the direction of detector arrays (z direction) and a method of convoluting a filer to a tomographic image space in the z direction. The two methods are optimized in terms of a calculation time and tomographic image quality. Consequently, a tomographic image can be quickly reconstructed with high quality.

    摘要翻译： 本发明旨在通过包括具有矩阵结构的二维区域X射线检测器的X射线CT装置进行的常规（轴向）扫描，电影扫描或螺旋扫描来提高图像质量。 在基于由包括由多阵列X射线检测器或平板X射线检测器表示的二维区域X射线检测器的X射线CT装置中进行的三维图像重构中的螺旋扫描图像重建中， 检测器，并且具有矩阵结构，根据包括在多阵列X射线检测器中的一个检测器阵列的宽度的表示切片厚度的图像根据将z方向滤波器卷积到投影数据的方法中的任一种被重建 检测器阵列（z方向）的方向的项目以及将扫描器卷绕到z方向上的断层图像空间的方法。 这两种方法在计算时间和断层图像质量方面进行了优化。 因此，可以以高质量快速重建断层图像。

    X-RAY CT APPARATUS
    2.
    发明申请
    X-RAY CT APPARATUS 有权
    X射线CT装置

    公开(公告)号：US20070071160A1

    公开(公告)日：2007-03-29

    申请号：US11534126

    申请日：2006-09-21

    申请人： Akihiko Nishide ,  Akira Hagiwara ,  Yasuhiro Imai ,  Makoto Gohno

    发明人： Akihiko Nishide ,  Akira Hagiwara ,  Yasuhiro Imai ,  Makoto Gohno

    IPC分类号： H05G1/60 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

    CPC分类号： G01N23/046 ,  A61B6/027 ,  A61B6/032 ,  A61B6/469 ,  A61B6/583 ,  G01N2223/419 ,  G01N2223/612

    摘要： The present invention is intended to improve image quality ensured by a conventional (axial) scan, a cine scan, or a helical scan performed by an X-ray CT apparatus including a two-dimensional area X-ray detector that has a matrix structure. In helical scan image reconstruction based in three-dimensional image reconstruction performed in an X-ray CT apparatus including a two-dimensional area X-ray detector that is represented by a multi-array X-ray detector or a flat-panel X-ray detector and that has a matrix structure, an image expressing a slice thickness larger than the width of one detector array included in a multi-array X-ray detector is reconstructed according to either of a method of convoluting a z-direction filter to projection data items in the direction of detector arrays (z direction) and a method of convoluting a filer to a tomographic image space in the z direction. The two methods are optimized in terms of a calculation time and tomographic image quality. Consequently, a tomographic image can be quickly reconstructed with high quality.

    摘要翻译： 本发明旨在通过包括具有矩阵结构的二维区域X射线检测器的X射线CT装置进行的常规（轴向）扫描，电影扫描或螺旋扫描来提高图像质量。 在基于由包括由多阵列X射线检测器或平板X射线检测器表示的二维区域X射线检测器的X射线CT装置中进行的三维图像重构中的螺旋扫描图像重建中， 检测器，并且具有矩阵结构，根据包括在多阵列X射线检测器中的一个检测器阵列的宽度的表示切片厚度的图像根据将z方向滤波器卷积到投影数据的方法中的任一种被重建 检测器阵列（z方向）的方向的项目以及将扫描器卷绕到z方向上的断层图像空间的方法。 这两种方法在计算时间和断层图像质量方面进行了优化。 因此，可以以高质量快速重建断层图像。

    X-ray CT apparatus
    4.
    发明申请
    X-ray CT apparatus 审中-公开
    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。

    X-RAY CT APPARATUS
    6.
    发明申请
    X-RAY CT APPARATUS 失效
    X射线CT装置

    公开(公告)号：US20080031407A1

    公开(公告)日：2008-02-07

    申请号：US11680404

    申请日：2007-02-28

    申请人： Yusuke Satta ,  Kazuhiko Sato ,  Akihiko Nishide ,  Akira Hagiwara

    发明人： Yusuke Satta ,  Kazuhiko Sato ,  Akihiko Nishide ,  Akira Hagiwara

    IPC分类号： A61B6/03 ,  G21K1/02

    CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/032 ,  A61B6/0457 ,  G06T2211/421

    摘要： The present invention is to easily associate X-ray projection data and scanning table z-direction coordinate information with each other. Using set parameters of the operations of a scanning gantry and a scanning table, the association of the X-ray projection data and scanning table z-direction coordinate information with each other is executed. Thereafter, image reconstruction is carried out based on the X-ray projection data to obtain a tomographic image. The operation set parameters are stored as part of the X-ray projection data. Alternatively, they are collectively stored even in the case of files separate from the X-ray projection data.

    摘要翻译： 本发明能够容易地将X射线投影数据和扫描表z方向坐标信息相互关联。 使用扫描台架和扫描台的操作的设定参数，执行X射线投影数据和扫描台z方向坐标信息的关联。 此后，基于X射线投影数据进行图像重建以获得断层图像。 操作设置参数作为X射线投影数据的一部分存储。 或者，即使在与X射线投影数据分离的文件的情况下也集体存储。

    X-ray CT apparatus and X-ray CT imaging method
    7.
    发明申请
    X-ray CT apparatus and X-ray CT imaging method 失效
    X射线CT装置和X线CT成像方法

    公开(公告)号：US20060093083A1

    公开(公告)日：2006-05-04

    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： H05G1/60 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

    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。

    X-ray CT imaging method and x-ray CT system
    8.
    发明申请
    X-ray CT imaging method and x-ray CT system 审中-公开
    X射线CT成像方法和X射线CT系统

    公开(公告)号：US20050008116A1

    公开(公告)日：2005-01-13

    申请号：US10885189

    申请日：2004-07-06

    申请人： Akihiko Nishide ,  Tetsuya Horiuchi ,  Akira Hagiwara

    发明人： Akihiko Nishide ,  Tetsuya Horiuchi ,  Akira Hagiwara

    IPC分类号： A61B6/03 ,  G21K1/12 ,  A61B6/00 ,  G01N23/00 ,  H05G1/60

    CPC分类号： A61B6/032 ,  A61B6/027

    摘要： An object of the present invention is to utilize a distance, which is linearly moved for acceleration or deceleration, out of an overall distance linearly moved during a helical scan for the purpose of image reconstruction. Projection data is acquired even during acceleration or deceleration of linear movement made for a helical scan. The acquired projection data is utilized for image reconstruction. Moreover, during the acceleration of linear movement, while a tube current is being increased, projection data is acquired. During the deceleration of linear movement, while the tube current is being decreased, projection data is acquired.

    摘要翻译： 为了图像重构的目的，本发明的目的是利用在螺旋扫描过程中线性移动的整个距离内的加速或减速线性移动的距离。 甚至在进行螺旋扫描的线性运动的加速或减速期间也获取投影数据。 获取的投影数据被用于图像重建。 此外，在线性运动的加速期间，当管电流增加时，获取投影数据。 在线性运动减速期间，当管电流减小时，获取投影数据。

    X-RAY CT APPARATUS
    9.
    发明申请
    X-RAY CT APPARATUS 有权
    X射线CT装置

    公开(公告)号：US20070286332A1

    公开(公告)日：2007-12-13

    申请号：US11757732

    申请日：2007-06-04

    申请人： Makoto Gohno ,  Tetsuya Horiuchi ,  Akihiko Nishide ,  Akira Hagiwara

    发明人： Makoto Gohno ,  Tetsuya Horiuchi ,  Akihiko Nishide ,  Akira Hagiwara

    IPC分类号： A61B6/00 ,  G01N23/00 ,  G21K1/12 ,  H05G1/60

    CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/488 ,  A61B6/542 ,  H05G1/30

    摘要： The present invention aims to obtain a tomographic image similar in image quality to a tomographic image obtained by executing a scan at X-ray tube current value set by an X-ray automatic exposure function even when the X-ray tube current value set by the X-ray automatic exposure function are not within a standard range of the X-ray tube current values settable at the X-ray tube (21). X-ray tube current value supplied to the X-ray tube (21) are set by the X-ray automatic exposure function. Thereafter, when the X-ray tube current value set by the X-ray automatic exposure function is not within in the standard range of the X-ray tube current value settable at the X-ray tube, the X-ray tube current value at a portion not within the standard range are changed so as to be within the standard range, and the set value of helical pitch is changed so as to correspond to the ratio between the pre-changed x-ray tube current value and the post-changed X-ray tube current value.

    摘要翻译： 本发明的目的在于获得与通过由X射线自动曝光功能设定的X射线管电流值执行扫描而获得的断层图像相似的断层图像，即使当由X射线管电流值 X射线自动曝光功能不在X射线管（21）可设定的X射线管电流值的标准范围内。 通过X射线自动曝光功能设定供给X射线管（21）的X射线管电流值。 此后，当通过X射线自动曝光功能设定的X射线管电流值不在可设置在X射线管的X射线管电流值的标准范围内时，X射线管电流值在 不在标准范围内的部分被改变为在标准范围内，并且改变螺距的设定值，以便对应于预先改变的X射线管电流值和后变化的X射线管电流值之间的比率 X射线管电流值。

    X-RAY CT SYSTEM
    10.
    发明申请
    X-RAY CT SYSTEM 有权
    X射线CT系统

    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。