公开(公告)号：US06243440B1

公开(公告)日：2001-06-05

申请号：US09299075

申请日：1999-04-26

申请人： Shiro Oikawa ,  Susumu Adachi ,  Takayuki Takemoto ,  Yasukuni Yamane

发明人： Shiro Oikawa ,  Susumu Adachi ,  Takayuki Takemoto ,  Yasukuni Yamane

IPC分类号： H05G164

CPC分类号： A61B6/032

摘要： An apparatus using a two-dimensional radiation sensor for acquiring X-ray penetration images or the like. A monitoring radiography is performed with a small dose before a production radiography. A radiographic condition for the production radiography, specifically a radiation emitting period or a tube current of a radiation generator, is computed based on a ratio between a quantity of charges in a region of interest collected from the two-dimensional radiation sensor in time of the monitoring radiography and a desired quantity of charges in the region of interest in time of the production radiography. The production radiography is carried out based on a result of the computation to acquire a high quality image.

摘要翻译： 使用二维辐射传感器获取X射线穿透图像等的装置。 在生产射线照相之前，以小剂量进行监测放射照相。 基于从二维辐射传感器收集的感兴趣区域中的电荷量之间的比率来计算用于生产放射线照相术的射线照相条件，特别是辐射发射周期或辐射发生器的管电流， 监测放射成像以及在生产射线照相时期感兴趣的区域中的期望数量的电荷。 基于计算的结果进行生产射线照相以获得高质量的图像。

公开(公告)号：US06330303B1

公开(公告)日：2001-12-11

申请号：US09429012

申请日：1999-10-28

申请人： Yasukuni Yamane ,  Shiro Oikawa

发明人： Yasukuni Yamane ,  Shiro Oikawa

IPC分类号： H05G164

CPC分类号： A61B6/032

摘要： A scanning line drive circuit performs not only a sequential scanning function of scanning lines, but also an interlaced scanning function. For instance, in a fluoroscopy mode in which high-speed imaging and real-time imaging are required, the scanning line drive circuit performs interlaced scanning to scan, for example, every other scanning line. With the interlaced scanning, since the scanning lines are scanned one line at a time like the sequential scanning, a variation of charge on a signal line side does not increase during a transition of a scanning line voltage like conventional scanning in which a plurality of scanning lines are scanned simultaneously. It is therefor possible to obtain a good signal-to-noise ratio without an increase in noise due to fluctuations in the scanning line voltage. Moreover, since an increase in the variation of charge in the fluoroscopy mode can be limited by changing a scanning method of the scanning line drive circuit according to an imaging mode, a signal readout circuit does not need to have a complicated structure to limit the increase in the variation of charge.

摘要翻译： 扫描线驱动电路不仅执行扫描线的顺序扫描功能，而且还执行隔行扫描功能。 例如，在需要高速成像和实时成像的荧光透视模式中，扫描线驱动电路进行隔行扫描，例如扫描其它扫描线。 对于隔行扫描，由于扫描线在像顺序扫描那样扫描一行，所以在像扫描线电压的扫描线电压的转变期间信号线侧的电荷变化不会增加，其中多个扫描 线同时扫描。 由于扫描线电压的波动，可以获得良好的信噪比而不增加噪声。 此外，由于可以通过根据成像模式改变扫描线驱动电路的扫描方法来限制荧光透视模式中的电荷变化的增加，所以信号读出电路不需要具有复杂的结构来限制增加 在充电的变化中。

公开(公告)号：US5483071A

公开(公告)日：1996-01-09

申请号：US266606

申请日：1994-06-28

申请人： Shiro Oikawa ,  Takayuki Takemoto ,  Tutomu Katou ,  Shirou Suzuki ,  Kenkichi Tanioka

发明人： Shiro Oikawa ,  Takayuki Takemoto ,  Tutomu Katou ,  Shirou Suzuki ,  Kenkichi Tanioka

IPC分类号： A61B6/00 ,  G01T1/20 ,  H01L27/146 ,  H01L31/0264 ,  G01T1/202 ,  G01T1/24

CPC分类号： G01T1/2018 ,  H01L27/146 ,  H01L27/14676

摘要： A two-dimensional radiation detector for obtaining a radiographic image as converted into electric signals. The detector has a multi-layer structure including a scintilator, a translucent electrode film, a photoconductive film and a scan switch layer. The scan switch layer includes conductors arranged in matrix form and in contact with the photoconductive film, a plurality of FETs corresponding to the conductors arranged in matrix form, and a uniformly planar conductor for successively applying a bias voltage through the FETs to the matrix conductors row by row. Each FET has a drain electrode connected to one of the matrix conductors, a source electrode connected to the uniformly planar conductor, and a gate electrode connected to the drive circuit. The translucent electrode film includes column conductors corresponding to columns of the matrix conductors, each of the column conductors being connected to a signal reading line.

摘要翻译： 一种二维辐射检测器，用于获得转换为电信号的放射照相图像。 检测器具有包括闪烁体，透光性电极膜，感光膜和扫描开关层的多层结构。 扫描开关层包括以矩阵形式布置并与光电导膜接触的导体，对应于以矩阵形式布置的导体的多个FET，以及均匀平面的导体，用于连续地通过FET施加偏置电压到矩阵导体列 按行。 每个FET具有连接到矩阵导体之一的漏极电极，连接到均匀平面导体的源电极和连接到驱动电路的栅电极。 半透明电极膜包括与矩阵导体的列对应的列导体，每个列导体连接到信号读取线。

公开(公告)号：US5515411A

公开(公告)日：1996-05-07

申请号：US215950

申请日：1994-03-22

申请人： Hiromichi Tonami ,  Takahisa Nishikawa ,  Takayuki Takemoto ,  Yutaro Kimura ,  Keiichi Hiragaki ,  Hidetoshi Kishimoto ,  Tatsuya Shimizu ,  Shiro Oikawa ,  Tutomu Katou ,  Shirou Suzuki ,  Toshio Yamagishi ,  Kenkichi Tanioka

发明人： Hiromichi Tonami ,  Takahisa Nishikawa ,  Takayuki Takemoto ,  Yutaro Kimura ,  Keiichi Hiragaki ,  Hidetoshi Kishimoto ,  Tatsuya Shimizu ,  Shiro Oikawa ,  Tutomu Katou ,  Shirou Suzuki ,  Toshio Yamagishi ,  Kenkichi Tanioka

IPC分类号： G21K4/00 ,  H01J31/49 ,  H01J40/14

CPC分类号： H01J31/49 ,  G21K4/00 ,  G21K2004/04 ,  G21K2004/06

摘要： An X-ray image pickup tube converts a transmitted X-ray image into electric signals. The pickup tube includes a target structure having a fluorescent element, and a translucent conductive film for receiving a high voltage, with a photoconductive film laminated thereupon. The fluorescent element receives transmitted X rays in a two-dimensional distribution, and converts them into visible rays in a two-dimensional distribution. The translucnet conductive film is optically coupled to a surface of the fluorescent element opposite from an X-ray incident surface thereof. The photoconductive film includes an amorphors semiconductor layer which converts the visible rays transmitted in a two-dimensional distribution through the translucent conductive film, into electric charges in a two-dimensional distribution, and which multiplies the electric charges in the two-dimensional distribution based on electric fields formed by the high voltage applied to the translucent conductive film. The pickup tube also has a signal reading device in the form of an electron gun or switching elements for scanning a surface of the photoconductive film, as electric signals, a two-dimensional electric potential distribution occurring on the photoconductive film.

摘要翻译： X射线摄像管将透射的X射线图像转换为电信号。 拾取管包括具有荧光元件的目标结构和用于接收高电压的半透明导电膜，其上层叠有光电导膜。 荧光元件以二维分布接收透射的X射线，并将其转换成二维分布中的可见光。 透明导电膜光学耦合到与其X射线入射表面相对的荧光元件的表面。 光电导膜包括将通过半透明导电膜以二维分布透射的可见光转换为二维分布的电荷的非晶半导体层，并且将二维分布中的电荷乘以 由施加到半透明导电膜的高电压形成的电场。 拾取管还具有电子枪形式的信号读取装置或用于扫描光电导膜的表面作为电信号的光电导膜上出现的二维电位分布的开关元件。

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：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：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.