公开(公告)号：US20070126730A1

公开(公告)日：2007-06-07

申请号：US10579514

申请日：2004-11-08

申请人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa

发明人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa

IPC分类号： G06T1/00 ,  G06F17/00

CPC分类号： A61B6/504 ,  A61B5/02007 ,  A61B5/055 ,  A61B6/032 ,  A61B6/481 ,  G01R33/56325 ,  G01R33/5635 ,  G06T5/002 ,  G06T5/008 ,  G06T5/50 ,  G06T2207/10081 ,  G06T2207/10088 ,  G06T2207/10132 ,  G06T2207/20182 ,  G06T2207/20224 ,  G06T2207/30101

摘要： An image processing method comprises: an inputting step of inputting image data which is obtained by imaging a subject for a predetermined period of time with a medical imaging apparatus and is arranged in time series; an extracting along the time axis step of extracting pixels which satisfy a predetermined condition along the time axis from all the pixels arranged in time series for each pixel coordinate position with respect to each pixel in the image data; and a constructing step of constructing a two-dimensional or three-dimensional image based on the pixels extracted along the time axis in the extracting along the time axis step.

摘要翻译： 一种图像处理方法包括：输入步骤，输入通过用医学成像装置对被摄体成像一段预定时间而获得的图像数据，并且以时间顺序排列; 沿着时间轴步骤提取相对于图像数据中的每个像素从针对每个像素坐标位置以时间序列布置的全部像素沿时间轴提取满足预定条件的像素; 以及构建步骤，其基于沿着时间轴步骤的提取中沿着时间轴提取的像素构建二维或三维图像。

公开(公告)号：US20130243299A1

公开(公告)日：2013-09-19

申请号：US13989564

申请日：2011-12-07

申请人： Taiga Goto ,  Hisashi Takahashi ,  Koichi Hirokawa

发明人： Taiga Goto ,  Hisashi Takahashi ,  Koichi Hirokawa

IPC分类号： G06T11/00

CPC分类号： G06T11/003 ,  A61B6/032 ,  A61B6/4078 ,  G06T11/006 ,  G06T2211/421

摘要： In order to execute a high-resolution reconstructible distance-driven back projection process and to generate a high-resolution tomographic image, an X-ray CT apparatus 1 determines the presence/absence of opposing data corresponding to each piece of target data on the basis of scanning conditions, and calculates a phase range where opposing data is present (Step 21). The X-ray CT apparatus 1 performs high-resolution conversion of a zero-insertion method on a phase range where opposing data is present, and performs high-resolution conversion using a data interpolation method on a phase range where no opposing data is present, thereby creating double sampled high-resolution projection data, and calculates a view weight (Step 22). The X-ray CT apparatus 1 performs a distance-driven high-resolution back projection process using high-resolution projection data and generates a reconstructed image (Step 23).

摘要翻译： 为了执行高分辨率可重构的距离驱动反投影处理并生成高分辨率断层图像，X射线CT装置1基于每个目标数据确定对应的数据的存在/不存在 并计算相对数据存在的相位范围（步骤21）。 X射线CT装置1在存在相对数据的相位范围上执行零插入方式的高分辨率变换，并且在不存在相反数据的相位范围上使用数据插值方法进行高分辨率转换， 从而产生双重采样的高分辨率投影数据，并计算视图权重（步骤22）。 X射线CT装置1使用高分辨率投影数据进行距离驱动的高分辨率反投影处理，并生成重构图像（步骤23）。

公开(公告)号：US20090046833A1

公开(公告)日：2009-02-19

申请号：US12066469

申请日：2006-09-15

申请人： Koichi Hirokawa ,  Taiga Goto

发明人： Koichi Hirokawa ,  Taiga Goto

IPC分类号： H05G1/44

CPC分类号： A61B6/032 ,  A61B6/463 ,  A61B6/488 ,  A61B6/542

摘要： [Problems] To provide an X-ray CT apparatus capable of easily comparing image quality supposed to be obtained when not using a X-ray dose optimization function and image quality supposed to be obtained when using the X-ray dose optimization function at the stage of scan planning. [Means for Solving Problems] A 3-dimensional model of an object to be examined (17) is generated from scanogram projection data (S170). An image noise dispersion value corresponding to an imaging region of the object is predicted from the 3-dimensional model. The predicted image noise dispersion value is compared to a desired value of the image index value inputted by a user so as to calculate a modulation pattern of the irradiation X-ray amount (S200).By predicting the image quality supposed to be obtained when using and not using the X-ray dose optimization function, each of the predicted results is displayed so as to be compared on a display device (5) (S230).

摘要翻译： [问题]提供一种X射线CT装置，其能够容易地比较在不使用X射线剂量优化功能时应该获得的图像质量和在该阶段使用X射线剂量优化功能时应该获得的图像质量 的扫描计划。 （解决问题的手段）从扫描图投影数据生成待检查对象（17）的3维模型（S170）。 从3维模型预测与物体的成像区域对应的图像噪声色散值。 将预测图像噪声色散值与用户输入的图像索引值的期望值进行比较，以计算照射X射线量的调制图案（S200）。 通过预测在使用并不使用X射线剂量优化功能时应该获得的图像质量，显示每个预测结果以便在显示装置（5）上进行比较（S230）。

公开(公告)号：US20080273778A1

公开(公告)日：2008-11-06

申请号：US10588257

申请日：2005-02-15

申请人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa

发明人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa

IPC分类号： A61B6/03 ,  G06K9/00

CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/032 ,  G06T2211/412 ,  G06T2211/421

摘要： A weighting function is created according to an arbitrary bio-movement correction range and a projection data angle for back-projection (width in the view direction used for reconstruction), set by a user, by considering the degree of the bio-movement and redundancy. By using this weighting function, an image reconstruction is performed.The bio-movement correction range is set as a correction angle width index ε expressing the width guaranteed as a slope portion of the weighting function. The projection data angle for back-projection (data width) is determined by considering the data redundancy, SN, time width (time resolution) contributing to the image.By determining the weight according to these two parameters, it is possible to apply reconstruction of projection data of all the scan ranges in the reconstruction of the tomogram and prevent lowering of the data contribution ratio as well as reduce the motion artifact, thereby obtaining a high-quality image.

摘要翻译： 根据用户设定的任意生物移动校正范围和背投影投影数据角度（用于重建的视线方向的宽度），通过考虑生物移动和冗余度来创建加权函数 。 通过使用该加权函数，执行图像重建。 生物运动校正范围被设定为表示作为加权函数的斜率部分保证的宽度的校正角宽度指数ε。 通过考虑对图像有贡献的数据冗余度，SN，时间宽度（时间分辨率）来确定反投影的投影数据角度（数据宽度）。 通过根据这两个参数确定权重，可以在重建断层图像中应用所有扫描范围的投影数据的重建，并且防止数据贡献率的降低以及减少运动伪像，从而获得高 质量形象。

公开(公告)号：US20070189436A1

公开(公告)日：2007-08-16

申请号：US11629756

申请日：2005-06-15

申请人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa ,  Hiroto Kokubun

发明人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa ,  Hiroto Kokubun

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

CPC分类号： G06T11/005 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/503 ,  A61B6/541 ,  G06T2211/412

摘要： A radiotomography apparatus according to the present invention includes a radiation detection device that irradiates radiation from a radiation source in multiple directions around an object to be examined and detects radiation transmitted through the object from the multiple directions; a table on which the object lies and which can move the object in a body axis direction of the object; reconstruction parameter setting device that sets reconstruction parameters that include an amount of movement of the table in the body axis direction, and that are used to reconstruct an image of the object; a reconstruction view area calculating device that calculates a reconstruction view area for at least one data segment that is necessary for a reconstruction calculation that is determined for each spatial position that is reconstructed based on the set reconstruction parameters; a reference segment position setting device that sets a reference segment position in the calculated reconstruction view area according to a phase signal that is obtained by dynamic analysis of the object; an effective segment calculating device that calculates a data segment including the set reference segment position as an effective segment using a predetermined weight function; and an image creating device that creates an image by reconstructing the calculated effective segments. It is thus possible to provide a radiotomography apparatus that can both enhance temporal resolution and reduce ineffective radiation exposure.

摘要翻译： 根据本发明的放射摄影术装置包括：放射线检测装置，其从围绕被检体的多个方向照射来自辐射源的辐射，并从多个方向检测透过物体的辐射; 物体所在的桌子，并且可以在物体的身体轴线方向上移动物体; 重建参数设置装置，其设置包括所述表在所述体轴方向上的移动量的重建参数，并且用于重建所述对象的图像; 重构视区计算装置，其根据所设置的重建参数，计算针对重建计算确定的每个空间位置所确定的至少一个数据段的重构视区; 参考分段位置设定装置，根据通过物体的动态分析获得的相位信号，在计算出的重建视区内设定基准分段位置; 有效段计算装置，其使用预定的权重函数来计算包括所设置的参考段位置的数据段作为有效段; 以及通过重建所计算的有效段来创建图像的图像创建装置。 因此，可以提供能够增强时间分辨率并减少无效辐射暴露的放射摄影术设备。

公开(公告)号：US09123156B2

公开(公告)日：2015-09-01

申请号：US13824697

申请日：2011-10-13

申请人： Hisashi Takahashi ,  Taiga Goto ,  Koichi Hirokawa

发明人： Hisashi Takahashi ,  Taiga Goto ,  Koichi Hirokawa

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

CPC分类号： G06T11/006 ,  A61B6/032 ,  A61B6/5205 ,  A61B6/5264 ,  G06T2211/424

摘要： In order to provide an X-ray CT apparatus and the like that reconstruct an image using an iterative approximation method which ensures stable convergence and can be executed at high speed, a computation device 5 of an X-ray CT apparatus 1 calculates matrices A, B, D, R, and R′ on the basis of the scanning conditions input through an input device 6 (step 1). Then, the computation device 5 calculates each element of a matrix I−α(SBTDA+βSR) (step 2). Then, the computation device 5 calculates the operator norm ∥I−α(SBTDA+βSR)∥ of the matrix I−α(SBTDA+βSR) (step 3). Then, the computation device 5 determines a relaxation coefficient α such that a predetermined conditional expression is satisfied (step 4).

摘要翻译： 为了提供使用确保稳定收敛并且可以高速执行的迭代逼近方法来重建图像的X射线CT装置等，X射线CT装置1的计算装置5计算矩阵A， 基于通过输入装置6输入的扫描条件（步骤1），B，D，R和R'。 然后，计算装置5计算矩阵I-α（SBTDA +＆bgr; SR）的每个元素（步骤2）。 然后，计算装置5计算矩阵I-α（SBTDA +＆bgr; SR）的运算符范数‖I-α（SBTDA +＆bgr; SR）∥（步骤3）。 然后，计算装置5确定满足预定条件表达式的松弛系数α（步骤4）。

公开(公告)号：US20100014630A1

公开(公告)日：2010-01-21

申请号：US12527009

申请日：2008-02-14

申请人： Taiga Goto ,  Koichi Hirokawa ,  Toshiyuki Irie

发明人： Taiga Goto ,  Koichi Hirokawa ,  Toshiyuki Irie

IPC分类号： A61B6/03 ,  A61B6/00

CPC分类号： A61B5/4869 ,  A61B6/50 ,  A61B6/505 ,  A61B6/542

摘要： An X-ray CT apparatus acquires a scanogram of an object to be examined, generates an ellipse model having an X-ray attenuation coefficient equivalent to that of water and approximated to a tomographic image of the obtained imaged portion from the feature quantity of the projection value profile, determines whether or not the generated elliptic model is adequate as a model of the imaged portion from another feature quantity with respect to the projection value profile, generates a corrected elliptic model according to yet another feature quantity with respect to the projection value profile if the elliptic model is determined to be inadequate, and controls the modulation of the tube current in an X-ray source so that a predetermined target SD value is maintained in any scanning position when a tomographic image is reconstructed according to X-rays transmitted through the object by using the elliptic model or the corrected elliptic model.

摘要翻译： X射线CT装置获取待检查对象的扫描图，生成具有与水的X射线衰减系数相当的X射线衰减系数的椭圆模型，并从投影的特征量近似于所获得的成像部的断层图像 值轮廓，根据另一特征量相对于投影值轮廓确定生成的椭圆模型是否足够作为成像部分的模型，根据与投影值轮廓相关的另一特征量生成校正的椭圆模型 如果椭圆模型被确定为不足，并且控制X射线源中的管电流的调制，使得当根据透射的X射线重建断层图像时，在任何扫描位置保持预定的目标SD值 该对象通过使用椭圆模型或校正的椭圆模型。

公开(公告)号：US07602880B2

公开(公告)日：2009-10-13

申请号：US12066469

申请日：2006-09-15

申请人： Koichi Hirokawa ,  Taiga Goto

发明人： Koichi Hirokawa ,  Taiga Goto

IPC分类号： H05G1/44

CPC分类号： A61B6/032 ,  A61B6/463 ,  A61B6/488 ,  A61B6/542

摘要： [Problems] To provide an X-ray CT apparatus capable of easily comparing image quality supposed to be obtained when not using a X-ray dose optimization function and image quality supposed to be obtained when using the X-ray dose optimization function at the stage of scan planning.[Means for Solving Problems] A 3-dimensional model of an object to be examined (17) is generated from scanogram projection data (S170). An image noise dispersion value corresponding to an imaging region of the object is predicted from the 3-dimensional model.The predicted image noise dispersion value is compared to a desired value of the image index value inputted by a user so as to calculate a modulation pattern of the irradiation X-ray amount (S200).By predicting the image quality supposed to be obtained when using and not using the X-ray dose optimization function, each of the predicted results is displayed so as to be compared on a display device (5) (S230).

摘要翻译： [问题]提供一种X射线CT装置，其能够容易地比较在不使用X射线剂量优化功能时应该获得的图像质量和在该阶段使用X射线剂量优化功能时应该获得的图像质量 的扫描计划。 （解决问题的手段）从扫描图投影数据生成待检查对象（17）的3维模型（S170）。 从3维模型预测与物体的成像区域对应的图像噪声色散值。 将预测图像噪声色散值与用户输入的图像索引值的期望值进行比较，以计算照射X射线量的调制图案（S200）。 通过预测在使用并不使用X射线剂量优化功能时应该获得的图像质量，显示每个预测结果以便在显示装置（5）上进行比较（S230）。

公开(公告)号：US20060165211A1

公开(公告)日：2006-07-27

申请号：US10524341

申请日：2003-08-28

申请人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa

发明人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa

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

CPC分类号： G06T11/005 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4085 ,  G06T2211/421

摘要： A tomograph which determines projection data phase range capable of back projection for each reconfigured voxel with an arbitrary value larger than π so that the absolute values of cone angles at the ends of this phase range is minimized, calculates an approximate straight line for a curve indicating the position of a radiation source with respect to the channel direction position of parallel beam projection data obtained by a parallel beam of a parallel shape viewed from the go-around axis direction generated from the radiation source, and based on the determined projection data range capable of back projection, three-dimension back projects the parallel beam projection data subjected to filter processing created through a filter correction to the back projection region corresponding to the region in concern along the approximate irradiation trace of the radiation beam calculated using the calculated approximate straight line, thereby suppressing generation of the distortion attributed to data discontinuity, simplifying an arcsin calculation and significantly increasing the processing speed of the tomograph.

摘要翻译： 确定能够以大于pi的任意值对每个重新配置的体素进行反投影的投影数据相位范围的断层图像，使得在该相位范围的末端处的锥角的绝对值最小化，计算出曲线的近似直线， 辐射源相对于由从辐射源产生的从复原轴线方向观察的平行光束的平行光束投影数据的通道方向位置的位置，并且基于所确定的投影数据范围能够 背投影，三维后投影通过滤波器校正产生的滤波处理的平行光束投影数据沿着与所计算的近似直线计算的辐射束的近似照射轨迹相对应的区域的背投影区域 ，从而抑制失真属性的产生 减少数据不连续性，简化了arcsin计算，并显着提高了层析成像的处理速度。

公开(公告)号：US08189736B2

公开(公告)日：2012-05-29

申请号：US12671872

申请日：2008-08-06

申请人： Koichi Hirokawa ,  Taiga Goto ,  Takayuki Kadomura

发明人： Koichi Hirokawa ,  Taiga Goto ,  Takayuki Kadomura

IPC分类号： A61B6/00

CPC分类号： A61B6/032 ,  A61B6/405 ,  A61B6/482 ,  A61B6/488 ,  A61B6/545

摘要： Provided is an X-ray CT apparatus which can perform CT scan of multi-energy scanning at a high speed and can obtain an image having an excellent substance distinguishing ability. The X-ray CT apparatus includes: means to continuously perform a first CT scanning using a first X-ray energy and a second CT scanning using a second X-ray energy without interrupting CT scan; means to transit the X-ray energy emitted from the X-ray during a transition period TR including an end of the first CT scanning and a beginning of the second CT scanning from the first X-ray energy to the second X-ray energy; and means to compensate the scan data in the transition period by the opposing data in the residual scan period so as to reconstruct an image.

摘要翻译： 本发明提供能够高速进行多能量扫描的CT扫描的X射线CT装置，能够得到具有优异的物质辨别能力的图像。 X射线CT装置包括：使用第一X射线能量和第二次CT扫描连续进行第一次CT扫描的装置，使用第二X射线能量而不中断CT扫描; 在包括第一CT扫描的结束和从第一X射线能量开始到第二X射线能量的过渡期间TR中将从X射线发射的X射线能量传递到第二X射线能量的装置; 以及用于在所述剩余扫描周期中通过相对数据补偿所述过渡期间中的扫描数据以便重构图像的装置。