公开(公告)号：US07186023B2

公开(公告)日：2007-03-06

申请号：US10862458

申请日：2004-06-08

申请人： Hisanori Morita ,  Shiro Oikawa

发明人： Hisanori Morita ,  Shiro Oikawa

IPC分类号： G01D18/00

CPC分类号： A61B6/583 ,  A61B6/4092 ,  A61B6/466

摘要： Projection images of a calibration phantom are picked up and stored. Three-dimensional position information on an X-ray tube and an area detector is obtained from the projection images and three-dimensional arrangement information on markers inside the calibration phantom. Three-dimensional position information is obtained for all projection images, and stored in a three-dimensional position information storage unit. Projection images of an object under examination are picked up by following the same tracks and the same sequence as when radiographing the calibration phantom. Radiographic data of the projection images is read. A reconstructing calculation is carried out for the object based on the three-dimensional position information on the X-ray tube and area detector relative to the calibration phantom, to create slice images or three-dimensional volume data of a selected site of the object.

摘要翻译： 拾取和存储校准体模的投影图像。 从投影图像和校准体模内的标记的三维排列信息获得X射线管和区域检测器的三维位置信息。 获得所有投影图像的三维位置信息，并存储在三维位置信息存储单元中。 检查对象的投影图像通过跟踪相同的轨迹和与放映校准体模时相同的顺序来拾取。 读取投影图像的射线照相数据。 基于关于X射线管和区域检测器的相对于校准体模的三维位置信息，对对象进行重建计算，以创建对象的所选位置的切片图像或三维体数据。

公开(公告)号：US20060274880A1

公开(公告)日：2006-12-07

申请号：US11447153

申请日：2006-06-06

申请人： Shiro Oikawa ,  Hisanori Morita

发明人： Shiro Oikawa ,  Hisanori Morita

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

CPC分类号： A61B6/4482 ,  A61B6/02

摘要： An FPD has a detecting plane with detecting elements arranged in rows (u-axis) and columns (v-axis) extending in two intersecting axial directions. In time of primary scanning, the FPD is moved about a sectional axis to maintain the u-axis parallel to a body axis constantly. Consequently, in a reconstruction process, a set of projection points on the detecting plane of X rays having passed through lattice points in one row along the body axis A of an imaginary three-dimensional lattice, is parallel to the u-axis. It is therefore possible to derive all projection data that should be projected back to the lattice points in one row, only from detection signals acquired from the detecting elements in two lines having the set of projection points in between. Thus, the quantity of detection signals required for obtaining the projection data is reduced to perform the reconstruction process at high speed.

摘要翻译： FPD具有检测平面，其检测元件排成行（u轴）和在两个相交的轴向方向上延伸的列（v轴）。 在初级扫描的时候，FPD围绕截面轴线移动，以保持u轴平行于体轴线。 因此，在重建处理中，沿虚拟三维网格的体轴A穿过一行中的格子点的X射线的检测面上的一组投影点平行于u轴。 因此，可以仅从具有两组中的投影点之间的两行中的检测元件获取的检测信号，导出应该投射回到一行中的格子点的所有投影数据。 因此，获得投影数据所需的检测信号的数量减少，以高速执行重建处理。

公开(公告)号：US07359479B2

公开(公告)日：2008-04-15

申请号：US11447153

申请日：2006-06-06

申请人： Shiro Oikawa ,  Hisanori Morita

发明人： Shiro Oikawa ,  Hisanori Morita

IPC分类号： A61B6/00

CPC分类号： A61B6/4482 ,  A61B6/02

摘要： An FPD has a detecting plane with detecting elements arranged in rows (u-axis) and columns (v-axis) extending in two intersecting axial directions. In time of primary scanning, the FPD is moved about a sectional axis to maintain the u-axis parallel to a body axis constantly. Consequently, in a reconstruction process, a set of projection points on the detecting plane of X rays having passed through lattice points in one row along the body axis A of an imaginary three-dimensional lattice, is parallel to the u-axis. It is therefore possible to derive all projection data that should be projected back to the lattice points in one row, only from detection signals acquired from the detecting elements in two lines having the set of projection points in between. Thus, the quantity of detection signals required for obtaining the projection data is reduced to perform the reconstruction process at high speed.

摘要翻译： FPD具有检测平面，其检测元件排成行（u轴）和在两个相交的轴向方向上延伸的列（v轴）。 在初级扫描的时候，FPD围绕截面轴线移动，以保持u轴平行于体轴线。 因此，在重建处理中，沿虚拟三维网格的体轴A穿过一行中的格子点的X射线的检测面上的一组投影点平行于u轴。 因此，可以仅从具有两组中的投影点之间的两行中的检测元件获取的检测信号，导出应该投射回到一行中的格子点的所有投影数据。 因此，获得投影数据所需的检测信号的数量减少，以高速执行重建处理。

公开(公告)号：US09480452B2

公开(公告)日：2016-11-01

申请号：US14384265

申请日：2012-03-21

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： A61B6/00 ,  G21K1/00

CPC分类号： A61B6/5282 ,  A61B6/4233 ,  A61B6/4291 ,  A61B6/4441 ,  A61B6/5211 ,  A61B6/5252 ,  A61B6/5258

摘要： A first and a second accumulated value calculating units are provided which, in a location where foil shadows by grid foil strips straddle pixels, identify this location based on geometry, and calculate straddle accumulated values of the foil shadows in the identified location. Even when the foil shadows by the grid foil strips straddle the pixels due to twisting and bending of the grid foil strips, such location is identified based on geometry and the straddle accumulated values of the foil shadows in the identified location are calculated. Therefore, even when changes are made in the pitches or pixel sizes of an X-ray grid and a flat panel X-ray detector (FPD), the foil shadows will be removed based on the straddle accumulated values. As a result, the foil shadows can be removed taking twisting and bending of the grid foil strips into consideration, and in a way to accommodate X-ray grids and FPDs of various sizes.

摘要翻译： 提供了第一和第二累积值计算单元，其在通过栅格箔条跨越像素的箔阴影的位置基于几何形状识别该位置，并且计算所识别位置中的箔阴影的跨越累积值。 即使当由于网格箔条的扭曲和弯曲而使得栅格箔条跨越像素的箔片受到影响时，基于几何形状来识别这样的位置，并且计算识别位置中的箔阴影的跨越累积值。 因此，即使在X射线格栅和平板X射线检测器（FPD）的间距或像素尺寸上进行改变，也将基于跨越累积值来移除箔阴影。 结果，考虑到网格箔条的扭曲和弯曲，并且以适应各种尺寸的X射线栅格和FPD的方式可以去除箔阴影。

公开(公告)号：US08494118B2

公开(公告)日：2013-07-23

申请号：US13027386

申请日：2011-02-15

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： H05G1/64

CPC分类号： A61B6/5252 ,  A61B6/4291 ,  A61B6/4441 ,  A61B6/4452 ,  A61B6/487 ,  A61B6/588

摘要： A radiographic apparatus includes a radiation source for emitting radiation, a radiation detecting device for detecting the radiation, a radiation grid placed to cover a radiation detecting plane of the radiation detecting device, a pattern storage device for storing a plurality of patterns of shadows of the radiation grid falling on the radiation detecting device, an image generating device for generating an original image showing the object under examination and the shadows of the radiation grid, based on detection signals outputted from the radiation detecting device, a grid shadow estimating device for estimating a pattern of superimposed grid shadows, which are the shadows of the radiation grid appearing on the original image, from the patterns of shadows stored in the pattern storage device, and a removing device for removing the shadows of the radiation grid from the original image based on the superimposed grid shadows estimated.

摘要翻译： 放射线照相设备包括用于发射辐射的辐射源，用于检测辐射的辐射检测装置，放置以覆盖放射线检测装置的辐射检测平面的辐射栅格，用于存储辐射检测装置的多个阴影图案的图案存储装置 落在辐射检测装置上的辐射网格，基于从放射线检测装置输出的检测信号，生成表示检查对象的原始图像和放射线网格的阴影的图像生成装置，用于估计 根据存储在图案存储装置中的阴影的图案，叠加的网格阴影（它们是出现在原始图像上的辐射网格的阴影）的图案，以及用于基于原始图像从原始图像中去除辐射网格的阴影的去除装置 叠加的网格阴影估计。

公开(公告)号：US20110200169A1

公开(公告)日：2011-08-18

申请号：US13027386

申请日：2011-02-15

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： H05G1/64

CPC分类号： A61B6/5252 ,  A61B6/4291 ,  A61B6/4441 ,  A61B6/4452 ,  A61B6/487 ,  A61B6/588

摘要： A radiographic apparatus includes a radiation source for emitting radiation, a radiation detecting device for detecting the radiation, a radiation grid placed to cover a radiation detecting plane of the radiation detecting device, a pattern storage device for storing a plurality of patterns of shadows of the radiation grid falling on the radiation detecting device, an image generating device for generating an original image showing the object under examination and the shadows of the radiation grid, based on detection signals outputted from the radiation detecting device, a grid shadow estimating device for estimating a pattern of superimposed grid shadows, which are the shadows of the radiation grid appearing on the original image, from the patterns of shadows stored in the pattern storage device, and a removing device for removing the shadows of the radiation grid from the original image based on the superimposed grid shadows estimated.

摘要翻译： 放射线照相设备包括用于发射辐射的辐射源，用于检测辐射的辐射检测装置，放置以覆盖放射线检测装置的辐射检测平面的辐射栅格，用于存储辐射检测装置的多个阴影图案的图案存储装置 落在辐射检测装置上的辐射网格，基于从放射线检测装置输出的检测信号，生成表示检查对象的原始图像和放射线网格的阴影的图像生成装置，用于估计 根据存储在图案存储装置中的阴影的图案，叠加的网格阴影（它们是出现在原始图像上的辐射网格的阴影）的图案，以及用于基于原始图像从原始图像中去除辐射网格的阴影的去除装置 叠加的网格阴影估计。

公开(公告)号：US5179583A

公开(公告)日：1993-01-12

申请号：US693267

申请日：1991-04-30

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： A61B6/03 ,  H01J35/06 ,  H01J35/24

CPC分类号： A61B6/035 ,  A61B6/4488 ,  H01J35/06 ,  H01J35/24

摘要： An X-ray tube for a CT apparatus comprises a ring-shaped vacuum tube containing a fixed cathode having a thermion emitting surface, a ring-shaped fixed anode, and a ring-shaped rotatable cathode interposed between the fixed cathode and fixed anode. The rotatable cathode defines a thermion receiving surface opposed to the thermion emitting surface, and a thermion emitting portion opposed to the fixed anode. Thermions are emitted from the thermion emitting portion toward the fixed anode while the rotatable cathode is suspended to non-contact state and rotated at high speed. With the thermions being accelerated and colliding on the fixed anode, an X-ray is generated toward the center of the vacuum tube. The X-ray generating position moves at high speed along a circumferential surface of the fixed anode with rotation of the rotatable cathode.

公开(公告)号：US06587539B2

公开(公告)日：2003-07-01

申请号：US10068891

申请日：2002-02-11

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： G01N2300

CPC分类号： G06T11/005 ,  A61B6/032 ,  A61B6/4085

摘要： An X-ray tube and an X-ray area detector are driven synchronously in scanning action to revolve about a scan axis extending substantially through the center of a region of interest of an object under examination. An image processor performs a predetermined image processing on projection data detected in each scan position. In the image processing, a low-pass filtering is applied to projection data in each row of pixels of the area detector perpendicular to a direction corresponding to the scan axis, the low-pass filtering being in accordance with a location on the scan axis to which each row of pixels is projected. This filtering reduces artifacts due to a volume scan mode appearing in three-dimensional volume data of the region of interest generated by projecting the projection data after the low-pass filtering back to a virtual three-dimensional lattice.

公开(公告)号：US06553093B2

公开(公告)日：2003-04-22

申请号：US10096679

申请日：2002-03-14

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： A61B600

CPC分类号： A61B6/4429 ,  A61B6/032

摘要： In a radiation tomography device, in case a wide photographing area is required, even if a resolution capability in a depth direction of a section of a subject including an intersection of a rotation axis and a radiation irradiating axis is low, a small Laminographic angle &agr;1 is set. In case a high resolution capability is required in the depth direction, even if the photographing area is narrow, a large Laminographic angle &agr;2 is set. Since a balance between the resolution capability in the depth direction of the subject and the photographing area can be adjusted by varying the Laminographic angle, the photographing modes can be freely selected to thereby carry out the tomography suitable for the photographing requirement.

公开(公告)号：US6104776A

公开(公告)日：2000-08-15

申请号：US123360

申请日：1998-07-28

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： G01N23/04 ,  G01N23/06 ,  G01N23/20 ,  G03B42/02 ,  A61B6/00

CPC分类号： G01N23/06 ,  G01N23/20025

摘要： A nondestructive test apparatus for testing a work is formed of a fixed radiation generating device; a rotatable work holding device situated near the radiation generating device; and a rotatable radiation image taking device situated near the work holding device at a side opposite to the radiation generating device. The radiation image taking device rotates or swings in accordance with rotation or swinging of the work holding device at a same angle thereto. The radiation image taking device receives and accumulates images of the work held on the work holding device and radiated by the radiation generating device while the work is being rotated or swung. It is possible to quickly obtain a sectional image with the relatively simple and compact structure. The test or inspection efficiency can be improved.

摘要翻译： 用于测试作业的非破坏性测试装置由固定辐射发生装置形成; 位于辐射产生装置附近的可旋转工作保持装置; 以及位于与所述放射线产生装置相对的一侧的所述工件保持装置附近的可旋转的放射线摄像装置。 照射摄像装置根据工件保持装置的旋转或摆动以相同的角度旋转或摆动。 放射线摄像装置接收并累积保持在作业保持装置上的作品的图像，并在工作正在旋转或摆动时由放射线产生装置辐射。 可以用相对简单紧凑的结构快速获得截面图像。 可以提高测试或检验效率。