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。

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。

公开(公告)号：US07251355B2

公开(公告)日：2007-07-31

申请号：US10266274

申请日：2002-10-08

申请人： Akihiko Nishide

发明人： Akihiko Nishide

IPC分类号： G06K9/00

CPC分类号： G06T7/00

摘要： When labeling is performed for a three-dimensional image, the present invention aims to reduce time required for labeling in the three-dimensional image by three-dimensionally referring connection relationships among image areas. To achieve this object, the following processing is performed. A variable i of label number is initialized to 1 (step S901), and pixels whose pixel value is 1 are searched for (step S902). The first time that a pixel whose pixel value is 1 is detected (step S903), the label number of the pixel is set to i (1) (step S904). When the next pixel (target pixel) whose pixel value is 1 is detected (step S905), if plural pixels having label numbers are detected within a three-dimensional neighboring mask, the smallest label number is assigned as the label number of the target pixel (step S907). If one pixel is detected, the label number is assigned as the label number of the target pixel. If all pixel values (except the target pixel) within the three-dimensional neighboring mask are 0, a label number (i+1) is assigned as the label number of the target pixel (step S909).

摘要翻译： 当对于三维图像进行标记时，本发明旨在通过三维地参考图像区域之间的连接关系来减少在三维图像中标记所需的时间。 为了实现该目的，进行以下处理。 将标签号的变量i初始化为1（步骤S901），搜索像素值为1的像素（步骤S902）。 检测像素值为1的像素的第一次（步骤S903），将像素的标号设定为i（1）（步骤904）。 当检测到像素值为1的下一个像素（目标像素）时（步骤S 905），如果在三维相邻掩模内检测到具有标号的多个像素，则将最小标签号分配为目标的标号 像素（步骤S907）。 如果检测到一个像素，则将标签号分配为目标像素的标签号。 如果三维相邻掩模内的所有像素值（目标像素除外）为0，则将标签号（i + 1）分配为目标像素的标号（步骤S909）。

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。

公开(公告)号：US20070019779A1

公开(公告)日：2007-01-25

申请号：US11489065

申请日：2006-07-19

申请人： Akihiko Nishide ,  Naoyuki Kawachi

发明人： Akihiko Nishide ,  Naoyuki Kawachi

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

CPC分类号： A61B6/5205 ,  A61B6/027 ,  A61B6/032

摘要： A data acquisition device, which has an X-ray detector including a plurality of channel widths at which channels at its central portion are fine and channels at its peripheral portions are coarse or rough, and a plurality of data acquisition ranges including a data acquisition range wide in a channel direction and a data acquisition range narrow in the channel direction, and which is capable of performing switching among the data acquisition ranges for each data acquisition, is used to perform data acquisition on the channels fine at the central portion in the data acquisition range narrow in the channel direction, whereby an X-ray CT apparatus is provided which is capable of performing high-resolution imaging and brings about more satisfactory image quality.

摘要翻译： 一种数据采集装置，其具有X射线检测器，该X射线检测器包括多个通道宽度，其中心部分处的通道精细，其周边部分的通道粗糙或粗糙;多个数据采集范围包括数据采集范围 在信道方向上宽的数据采集范围和在信道方向上窄的数据采集范围，并且能够在每个数据采集的数据采集范围之间进行切换，用于在数据的中心部分处精细地对信道执行数据采集 获取范围在通道方向上窄，由此提供能够执行高分辨率成像并且带来更令人满意的图像质量的X射线CT装置。

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。

公开(公告)号：US06937697B2

公开(公告)日：2005-08-30

申请号：US10738053

申请日：2003-12-17

申请人： Akihiko Nishide ,  Hirofumi Yanagita

发明人： Akihiko Nishide ,  Hirofumi Yanagita

IPC分类号： A61B6/03 ,  G01N23/04 ,  G06T11/00 ,  H05G1/44

CPC分类号： G06T11/005 ,  A61B6/032 ,  A61B6/4021 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612

摘要： An X-ray data collecting apparatus includes a first integrating means periodically executes sequential integration on detected signals from a plurality of X-ray detector elements corresponding to measurement channels in an X-ray detection apparatus at a constant time difference over a constant time period longer than the time difference; a second integrating means periodically executes sequential integration on detected signals from a plurality of X-ray detector elements corresponding to reference channels in the plurality of detector element rows in the X-ray detection apparatus at the same time difference as the constant time difference over the same time period as the constant time period; and a correcting means X-ray-dose corrects signals integrated by the first integrating means by signals integrated by the second integrating means that are integrated at the same time as the signals integrated by the first integration means, respectively.

摘要翻译： 一种X射线数据采集装置，包括：第一积分装置，在恒定时间间隔周期性地对来自X射线检测装置中与X射线检测装置的测量通道对应的X射线检测元件的检测信号进行连续的积分， 比时差; 第二积分装置周期性地对来自与X射线检测装置中的多个检测器元件行中的参考通道相对应的多个X射线检测器元件的检测信号以与该恒定时间差相同的时间差执行顺序积分 相同时间段为恒定时间段; 以及校正装置X射线剂量校正由第一积分装置积分的信号，由与第一积分装置积分的信号同时积分的由第二积分装置积分的信号进行校正。

公开(公告)号：US06845144B2

公开(公告)日：2005-01-18

申请号：US10360588

申请日：2003-02-08

申请人： Akihiko Nishide ,  Sarah K. Patch

发明人： Akihiko Nishide ,  Sarah K. Patch

IPC分类号： A61B6/03 ,  G06T11/00

CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/421 ,  Y10S378/901

摘要： To perform cone beam reconstruction by using projection data correctly corresponding to X-ray beam having passed through each pixel in the reconstruction area, data D1 is obtained which is plane projected to a plane based on projection data D0. Then, plane projection data D1 to the projection plane pp is projected to the reconstruction area in the direction of X-ray transmission to obtain back projection pixel data D2. Thereafter, back projection pixel data D2 will be added for each corresponding pixel for all views to obtain back projection data D3. The present invention provides reconstruction by device of projection data correctly corresponding to the X-ray beam having passed through the reconstruction area. Through the plane projection to a plane the operation will become simplified and faster.

摘要翻译： 为了通过使用正确对应于穿过重建区域中的每个像素的X射线束的投影数据来执行锥形束重建，获得基于投影数据D0投影到平面的平面的数据D1。 然后，将平面投影数据D1与投影平面pp投影到X射线透射方向的重建区域，以获得反投影像素数据D2。 此后，将针对所有视图为每个对应的像素添加背投影像素数据D2，以获得反投影数据D3。 本发明通过设备对通过重建区域的X射线束正确地对准投影数据。 通过平面投影到平面，操作将变得简单和快速。

公开(公告)号：US5309356A

公开(公告)日：1994-05-03

申请号：US502916

申请日：1990-04-02

申请人： Akihiko Nishide ,  Kazushige Takahashi

发明人： Akihiko Nishide ,  Kazushige Takahashi

IPC分类号： G06T3/00 ,  G06T11/00 ,  G06F15/42

CPC分类号： G06T3/0068 ,  G06T11/006

摘要： Continuous tomographic image data obtained by a tomographic image forming unit such as an X-ray CT scanner is stored in a two-dimensional image memory under the control of a control computer. A two-dimensional space filtering processor, a two-dimensional affine transformation processor and a two-dimensional image addition processor are connected to the control computer and execute two-dimensional affine transformation, two-dimensional image addition and two dimensional space filtering of the tomographic image data, so that a pseudo three-dimensional reprojected image is obtained.

摘要翻译： 由X射线CT扫描仪等断层图像形成单元得到的连续断层图像数据在控制计算机的控制下存储在二维图像存储器中。 二维空间滤波处理器，二维仿射变换处理器和二维图像加法处理器连接到控制计算机，执行二维仿射变换，二维图像加法和二维空间滤波 图像数据，从而获得伪三维重新投影图像。

公开(公告)号：US07756240B2

公开(公告)日：2010-07-13

申请号：US11956813

申请日：2007-12-14

申请人： Akihiko Nishide ,  Makoto Gohno

发明人： Akihiko Nishide ,  Makoto Gohno

IPC分类号： A61B6/00

CPC分类号： A61B6/405 ,  A61B6/027 ,  A61B6/4035 ,  A61B6/542 ,  A61B6/583

摘要： The present invention provides an X-ray CT apparatus capable of improving image quality of a dual energy image. The X-ray CT apparatus comprises an X-ray tube for applying X rays having a first energy spectrum and X rays having a second energy spectrum different from the first energy spectrum to a subject, an X-ray data acquisition unit for acquiring X-ray projection data of the first energy spectrum projected onto the subject and X-ray projection data of the second energy spectrum projected thereonto, dual energy image reconstructing unit for image-reconstructing tomographic images indicative of X-ray tube voltage-dependent information at X-ray absorption coefficients related to a distribution of atoms, based on the X-ray projection data of the first energy spectrum and the X-ray projection data of the second energy spectrum, and adjusting unit for adjusting conditions for the image reconstruction in order to optimize the tomographic images indicative of the X-ray tube voltage-dependent information.

摘要翻译： 本发明提供能够提高双能量图像的图像质量的X射线CT装置。 X射线CT装置包括：X射线管，用于将具有第一能谱的X射线和具有与第一能谱不同的第二能谱的X射线施加到被检体; X射线数据获取单元， 投影到被摄体上的第一能量谱的射线投影数据和投射到其上的第二能量谱的X射线投影数据，双能量图像重建单元，用于将X射线管电压依赖信息的X射线管电压依赖性信息进行图像重建， 基于第一能谱的X射线投影数据和第二能谱的X射线投影数据的与原子分布相关的射线吸收系数，以及用于调整图像重建的条件的调整单元，以优化 所述断层图像指示所述X射线管电压依赖性信息。