公开(公告)号：US07764763B2

公开(公告)日：2010-07-27

申请号：US12339592

申请日：2008-12-19

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： A61B6/03

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4021 ,  A61B6/4085 ,  G06T11/006

摘要： It is an object of the present invention to eliminate windmill artifacts that inevitably occurs when a helical scan is performed with an X-ray CT system. To this end, the present invention is equipped with an X-ray source, and an X-ray detector having a plurality of detector elements arranged two-dimensionally, and disposed opposite to the X-ray source with a predetermined rotation center axis therebetween. The invention further includes reconstruction means for performing an arithmetic operation, in which two-dimensional projection data obtained based on X-ray detection data detected by the detector elements while rotating the X-ray source around the rotation center axis are back projected along a path different in a Z-axis direction extending along the rotation center axis from the X-ray path of the projection data, to reconstruct an image.

摘要翻译： 本发明的目的是消除当用X射线CT系统进行螺旋扫描时不可避免地发生的风车伪影。 为此，本发明装备有X射线源和具有多个二维排列的检测器元件的X射线检测器，并且与X射线源相对设置有预定的旋转中心轴。 本发明还包括用于执行算术运算的重建装置，其中在沿着旋转中心轴旋转X射线源的同时基于由检测器元件检测的X射线检测数据获得的二维投影数据沿着路径 在投影数据的X射线路径上沿着旋转中心轴线延伸的Z轴方向上不同，以重建图像。

公开(公告)号：US5473251A

公开(公告)日：1995-12-05

申请号：US135047

申请日：1993-10-12

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： A61B5/055 ,  G01R33/34 ,  G01R33/341 ,  G01R33/36 ,  G01V3/00

CPC分类号： G01R33/34061 ,  G01R33/3678

摘要： A pair of 8-shaped coils vertically sandwiches an object to be examined for providing a magnetic field in the horizontal direction perpendicular to the body axis in the object. A pair of rectangular coils also vertically sandwiches the object for providing a magnetic field in the vertical direction in the object. The pair of 8-shaped coils is connected for detecting a first magnetic resonance signal from the object and the pair of rectangular coils is connected for detecting a second magnetic resonance signal from the object. A phase of one of an output of the pair of 8-shaped coils and an output of the pair of rectangular coils is shifted by 90.degree. and summing a shifted output and the other output. An upper coil assembly of the 8-shaped coil pair and the rectangular coil pair is connected to a lower coil assembly at one end thereof in the lateral direction of the object and is pivotal to be freely opened and closed. To mount the coil assembly to the object, the upper coil assembly is opened, the object is placed on the lower coil assembly, and the upper coil assembly is closed.

摘要翻译： 一对8形线圈垂直地夹着待检查对象，以在物体中垂直于身体轴线的水平方向提供磁场。 一对矩形线圈还垂直地夹着物体，以在物体中沿垂直方向提供磁场。 一对8形线圈被连接用于检测来自物体的第一磁共振信号，并且连接一对矩形线圈以检测来自物体的第二磁共振信号。 一对8形线圈的输出和该对矩形线圈的输出之一的相位偏移90°，并将偏移的输出和另一个输出相加。 8线圈对和矩形线圈对的上部线圈组件在其一端处于下部线圈组件的主体的横向方向上并且枢转以自由地打开和关闭。 为了将线圈组件安装到物体上，上部线圈组件被打开，物体被放置在下部线圈组件上，并且上部线圈组件被关闭。

公开(公告)号：US4630202A

公开(公告)日：1986-12-16

申请号：US561072

申请日：1983-12-14

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： G01N23/04 ,  A61B6/03 ,  A61B6/04 ,  G06F15/42

CPC分类号： A61B6/0457 ,  A61B6/027 ,  A61B6/032 ,  Y10S378/901

摘要： In a computerized tomographic CT apparatus, X-rays penetrated from a slice of an object are computer-processed so as to reconstruct a tomographic image of the imaginary slice of the object. The CT apparatus is comprised of a table couch for supporting the object to be examined, a table couch drive control circuit for controlling a continuous transportation of the table couch along a longitudinal axis of the object, an X-ray source for irradiating fan-shaped X-rays toward the imaginary slice of the object, a detector array for detecting the fan-shaped X-rays which have penetrated throught the slice of the object. It further comprises a gantry for mounting the X-ray source and the detector array in such a manner that the X-ray source is positioned opposite from the detector array with respect to the slice of the object and for performing a relative movement between the X-ray source and the detector array in a plane which is perpendicular to the longitudinal axis of the object. The apparatus enables helical scanning to be effected by the continuous transportation of the table couch and the relative movement between them. A reconstruction control circuit is provided for processing the helically-scanned projection signals derived from the detector array so as to reconstruct a tomographic image of the slice of the object.

摘要翻译： 在计算机断层摄影CT装置中，对从物体的切片穿透的X射线进行计算机处理，以便重建物体的假想切片的断层图像。 CT装置包括用于支撑被检查物体的桌面沙发，用于控制桌子沿着物体的纵向轴线的连续输送的台式沙发驱动控制电路，用于照射扇形的X射线源 X射线朝向物体的虚拟切片，用于检测穿透物体切片的扇形X射线的检测器阵列。 其还包括用于安装X射线源和检测器阵列的台架，使得X射线源相对于物体的切片与检测器阵列相对定位，并且用于执行X的相对运动 射线源和检测器阵列在垂直于物体纵轴的平面内。 该装置能够通过桌子的连续输送和它们之间的相对运动来实现螺旋扫描。 提供了一种重构控制电路，用于处理从检测器阵列导出的螺旋扫描的投影信号，以便重建物体切片的断层图像。

公开(公告)号：US20090168952A1

公开(公告)日：2009-07-02

申请号：US12339592

申请日：2008-12-19

申请人： Issei MORI

发明人： Issei MORI

IPC分类号： A61B6/00

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4021 ,  A61B6/4085 ,  G06T11/006

摘要： It is an object of the present invention to eliminate windmill artifacts that inevitably occurs when a helical scan is performed with an X-ray CT system. To this end, the present invention is equipped with an X-ray source, and an X-ray detector having a plurality of detector elements arranged two-dimensionally, and disposed opposite to the X-ray source with a predetermined rotation center axis therebetween. The invention further includes reconstruction means for performing an arithmetic operation, in which two-dimensional projection data obtained based on X-ray detection data detected by the detector elements while rotating the X-ray source around the rotation center axis are back projected along a path different in a Z-axis direction extending along the rotation center axis from the X-ray path of the projection data, to reconstruct an image.

摘要翻译： 本发明的目的是消除当用X射线CT系统进行螺旋扫描时不可避免地发生的风车伪影。 为此，本发明装备有X射线源和具有多个二维排列的检测器元件的X射线检测器，并且与X射线源相对设置有预定的旋转中心轴。 本发明还包括用于执行算术运算的重建装置，其中在沿着旋转中心轴旋转X射线源的同时基于由检测器元件检测的X射线检测数据获得的二维投影数据沿着路径 在投影数据的X射线路径上沿着旋转中心轴线延伸的Z轴方向上不同，以重建图像。

公开(公告)号：US07496221B2

公开(公告)日：2009-02-24

申请号：US11072535

申请日：2005-03-07

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： G06K9/00 ,  G06K9/40

CPC分类号： G06T11/005 ,  A61B6/035

摘要： A radiological image diagnostic system is provided with a radiation generating unit, a radiation detecting unit, a clipping-correction unit and an image reconfiguration unit. The radiation generating unit generates a radiation. The radiation detecting unit detects the radiation from the radiation generating unit. The clipping-correction unit applies a clipping process to a radiation detected value by the radiation detecting unit and applies a mean value correction process to data acquired based upon the radiation detected value so that the separation of the local mean of the data acquired based upon the radiation detected value before and after the clipping process is reduced. The image reconfiguration unit generates an image using data acquired based upon a radiation detected value after the clipping process and after the mean value correction process.

摘要翻译： 放射线图像诊断系统设置有辐射发生单元，辐射检测单元，限幅校正单元和图像重新配置单元。 辐射产生单元产生辐射。 放射线检测单元检测来自辐射发生单元的辐射。 剪辑校正单元通过辐射检测单元对辐射检测值应用剪切处理，并将平均值校正处理应用于基于辐射检测值所获得的数据，使得基于所获取的数据的局部平均值的分离 削波过程之前和之后的辐射检测值减少。 图像重新配置单元使用在剪辑处理之后和平均值校正处理之后基于辐射检测值获取的数据来生成图像。

公开(公告)号：US20050201635A1

公开(公告)日：2005-09-15

申请号：US11072535

申请日：2005-03-07

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： G01T1/00 ,  A61B6/00 ,  A61B6/03 ,  G01N23/00 ,  G06K9/40 ,  G06T1/00 ,  G21K1/12 ,  H05G1/60

CPC分类号： G06T11/005 ,  A61B6/035

摘要： A radiological image diagnostic system is provided with a radiation generating unit, a radiation detecting unit, a clipping-correction unit and an image reconfiguration unit. The radiation generating unit generates a radiation. The radiation detecting unit detects the radiation from the radiation generating unit. The clipping-correction unit applies a clipping process to a radiation detected value by the radiation detecting unit and applies a mean value correction process to data acquired based upon the radiation detected value so that the separation of the local mean of the data acquired based upon the radiation detected value before and after the clipping process is reduced. The image reconfiguration unit generates an image using data acquired based upon a radiation detected value after the clipping process and after the mean value correction process.

摘要翻译： 放射线图像诊断系统设置有辐射发生单元，辐射检测单元，限幅校正单元和图像重新配置单元。 辐射产生单元产生辐射。 放射线检测单元检测来自辐射发生单元的辐射。 剪辑校正单元通过辐射检测单元对辐射检测值应用剪切处理，并将平均值校正处理应用于基于辐射检测值所获得的数据，使得基于所获取的数据的局部平均值的分离 削波过程之前和之后的辐射检测值减少。 图像重新配置单元使用在剪辑处理之后和平均值校正处理之后基于辐射检测值获取的数据来生成图像。

公开(公告)号：US5216367A

公开(公告)日：1993-06-01

申请号：US655036

申请日：1991-02-14

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： G01R33/3415

CPC分类号： G01R33/3415

摘要： In a magnetic resonance imaging apparatus, there are provided plural receiver coils over a portion of a biological body. Data on a coil energizing sequence is previously stored in a memory. An only limited number of receiving coils are sequentially energized based on the coil energizing sequence data.

摘要翻译： 在磁共振成像装置中，在生物体的一部分上设置有多个接收器线圈。 线圈通电序列中的数据预先存储在存储器中。 只有有限数量的接收线圈基于线圈通电序列数据被依次通电。

公开(公告)号：US4754468A

公开(公告)日：1988-06-28

申请号：US839560

申请日：1986-03-14

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： A61B6/03 ,  G01N23/04 ,  A61B6/00

CPC分类号： A61B6/4275 ,  A61B6/032 ,  G01N23/046 ,  G01N2223/419

摘要： An X-ray CT system includes an X-ray source, a drive device, an X-ray detector, a data acquisition system, a reconstruction processor and a delay circuit. The X-ray source emits an X-ray fan beam onto an object and is rotated by the drive device on substantially the same plane as the fan beam. A graticule sensor detects an angular position of the X-ray source. The X-ray detector consists of detector elements fixed concentrically with a relative rotational path of the X-ray source. The data acquisition system responds to a position signal from the graticule sensor and samples the output data from the detector for each predetermined angular position of the X-ray source to obtain projection data. The projection data is reconstructed by the reconstruction processor to obtain a tomographic image of the object. The delay circuit delays the position signal from the graticule sensor to offset the sampling point of the projection data by a 1/4 sampling point pitch from the angle corresponding to the center of each detection element.

摘要翻译： X射线CT系统包括X射线源，驱动装置，X射线检测器，数据采集系统，重建处理器和延迟电路。 X射线源将X射线扇形光束发射到物体上，并通过驱动装置旋转在与风扇光束基本相同的平面上。 刻度传感器检测X射线源的角位置。 X射线检测器由与X射线源的相对旋转路径同心固定的检测器元件组成。 数据采集​​系统响应来自刻度传感器的位置信号，并对来自X射线源的每个预定角度位置的检测器的输出数据进行采样以获得投影数据。 投影数据由重建处理器重建，以获得对象的断层图像。 延迟电路延迟来自刻度传感器的位置信号，以从与每个检测元件的中心对应的角度将投影数据的采样点偏移1/4采样点间距。

公开(公告)号：US4591984A

公开(公告)日：1986-05-27

申请号：US406514

申请日：1982-08-09

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： G01T1/15 ,  G01T1/17 ,  G06F15/42

CPC分类号： G01T1/171 ,  G01T1/15

摘要： A radiation measuring device comprising a radiation detector for detecting radiation quantum arriving in the Poisson distribution, a phase height analyzer for analyzing a height of an output signal from the detector to extract signal components at a level within a predetermined level, converter for integrating an output signal from the detector to produce pulses of which the number corresponds to the integrated value, a switch for selecting the output signal from the analyzer when the number of arrival photons is smaller than a predetermined value and for selecting the output signal from the converter when the number of photons is larger than the predetermined value and a counter for counting output pulses of the selected analyzer or counter.

摘要翻译： 一种辐射测量装置，包括用于检测到达泊松分布的辐射量子的辐射检测器，相位高度分析器，用于分析来自检测器的输出信号的高度，以提取在预定电平内的电平的信号分量，用于对输出进行积分 来自检测器的信号产生数字对应于积分值的脉冲，当到达光子数量小于预定值时用于选择来自分析器的输出信号的开关，以及当来自转换器的输出信号 光子数大于预定值，计数器用于计数所选择的分析器或计数器的输出脉冲。

公开(公告)号：US07583778B2

公开(公告)日：2009-09-01

申请号：US10895858

申请日：2004-07-22

申请人： Issei Mori

发明人： Issei Mori

IPC分类号： A61B6/03

CPC分类号： G06T11/006 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/5258

摘要： An X-ray CT apparatus is provided which can be suppressed or eliminated of aliasing occurrence in the R-R scheme. The X-ray CT apparatus has a reconstructing device for processing the collected data on each view to thereby obtain projection data and making a backprojection operation on the projection data to thereby reconstruct an image. In the reconstructing device, when the X-ray detector element closest to a rotation center of the detector system determines that an X-ray path for detecting the X-ray irradiated is in a position deviated by a sampling offset (first value) from the rotation center, projection data of the X-ray detector element at least in a vicinity of the rotation center upon the backprojection operation is backprojected to a position deviated by a backprojection offset (second value: different from the first value) from the rotation center. Namely, in the case projection data has a deviation from a desired alignment state, backprojection is made to a suitably offset position correspondingly to the misalignment state without backprojection as per the projection path, thus achieving aliasing suppression and resolving power maintenance.

摘要翻译： 提供了可以抑制或消除R-R方案中出现混叠的X射线CT装置。 X射线CT装置具有用于在每个视图上处理收集的数据的重建装置，从而获得投影数据并对投影数据进行反投影操作，从而重建图像。 在重建装置中，当最靠近检测器系统的旋转中心的X射线检测器元件确定用于检测被照射的X射线的X射线路径处于与来自该X射线检测器的采样偏移（第一值）偏离的位置时 旋转中心，至少在反投影操作时旋转中心附近的X射线检测器元件的投影数据被反向投影到偏离旋转中心的反投影偏移（第二值：不同于第一值）的位置。 也就是说，在投影数据与期望的对准状态有偏差的情况下，根据投影路径，不进行反投影，对应于未对准状态的适当偏移位置进行反投影，从而实现混叠抑制和分辨率维持。