公开(公告)号：US20150030128A1

公开(公告)日：2015-01-29

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

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 re 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： 提供第一和第二累积值计算单元，其在由栅格箔条跨越像素的箔片阴影的位置基于几何形状识别该位置，并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：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：US06643352B2

公开(公告)日：2003-11-04

申请号：US10310161

申请日：2002-12-05

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：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：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：US5172401A

公开(公告)日：1992-12-15

申请号：US692849

申请日：1991-04-29

申请人： Masatoshi Asari ,  Shiro Oikawa

发明人： Masatoshi Asari ,  Shiro Oikawa

IPC分类号： H01J35/14 ,  H01J35/30 ,  H05G1/70

CPC分类号： H05G1/70 ,  H01J35/14 ,  H01J35/30

摘要： A high-speed scan type X-ray generating apparatus for scanning X-ray generating positions along a circumference of an examinee, in which an electron beam is emitted from an electron gun into a ring-shaped vacuum tube. The electron beam is deflected by electromagnets or the like to run on a circular orbit through the vacuum tube. The electron beam is further deflected by different, small electromagnets to deviate from the circular orbit and impinge on a ring-shaped target, thereby generating an X-ray toward the center of the vacuum tube. By controlling the small electromagnets, the X-ray generating position is caused to scan at high speed along a circumferential wall of the ring-shaped target.

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：US07753586B2

公开(公告)日：2010-07-13

申请号：US12302795

申请日：2007-05-29

申请人： Shiro Oikawa

发明人： Shiro Oikawa

IPC分类号： G21K1/10 ,  H05G1/60 ,  G01D18/00

CPC分类号： A61B6/4233 ,  A61B6/032 ,  A61B6/06 ,  A61B6/4291 ,  A61B6/4441 ,  A61B6/583

摘要： A grid 3 arranged with a scattered radiation shielding plate 31 for each column is arranged at a front face of a radiation detector 2. The distance between the grid 3 and the radiation detector 2 is desirably a integral multiple of the height of the scattered radiation shielding plate 31. A true image signal of the pixel column including the shade is estimated from the image signal of the pixel column adjacent to the pixel column including the shade 41. The scattered radiation distribution is estimated from the image signals of the pixel column including the shade of the scattered radiation shielding plate and the image signals when considering that the shielding plate is not included in the shielded pixel. A clear diagnosis image without influence of scattered radiation is obtained by subtracting the estimated scattered radiation distribution from the estimated image signal distribution.

摘要翻译： 布置有每列的散射辐射屏蔽板31的栅格3布置在辐射检测器2的正面。栅格3和辐射检测器2之间的距离理想地是散射辐射屏蔽的高度的整数倍 从包括阴影41的像素列的像素列的图像信号估计包括阴影的像素列的真实图像信号。根据包括阴影的像素列的图像信号估计散射辐射分布 当考虑到屏蔽板不包括在屏蔽像素中时，散射辐射屏蔽板的阴影和图像信号。 通过从估计的图像信号分布中减去估计的散射辐射分布，获得不受散射辐射影响的清晰诊断图像。