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21. 发明授权

US09159146B2 Image reconstruction device and image reconstruction method configured to perform iteratively reconstructed image using weight coefficient 有权
标题翻译：图像重建装置和图像重建方法，配置为使用权重系数执行迭代重建图像
公开(公告)号：US09159146B2
公开(公告)日：2015-10-13
申请号：US14128769
申请日：2012-07-05
申请人： Hisashi Takahashi , Taiga Goto , Koichi Hirokawa
发明人： Hisashi Takahashi , Taiga Goto , Koichi Hirokawa
IPC分类号： G06K9/00 , G06T11/00
CPC分类号： G06T11/006 , G06T2211/412 , G06T2211/424
摘要： To provide an image reconstruction device capable of creating an image with image quality matching the operator's request when a cross-sectional image is reconstructed through a repeated calculation, the image reconstruction device which performs a repeated calculation on the basis of a difference between calculated projection data and measured projection data, the calculated projection data being obtained by performing a forward projection calculation on a reconstructed image which is reconstructed based on the measured projection data, includes an input section to which an image quality parameter which is considered to be important by an operator is input, a weight calculation section that calculates a weighting coefficient on the basis of the image quality parameter, and a repeated calculation section that performs a repeated calculation on the basis of a value obtained by weighting and adding a pixel value obtained in the previous iteration to a pixel value obtained from now using the weighting coefficient.
摘要翻译：为了提供一种能够通过重复计算重建横截面图像时，能够创建具有与操作者的请求相匹配的图像质量的图像重建装置，该图像重建装置基于计算出的投影数据之间的差进行重复计算并且测量的投影数据，通过对基于测量的投影数据重建的重建图像执行前向投影计算而获得的所计算的投影数据包括输入部分，被认为对于运营商来说重要的图像质量参数基于图像质量参数计算加权系数的权重计算部分，以及基于通过对在先前迭代中获得的像素值进行加权和相加而获得的值来执行重复计算的重复计算部分到从现在使用的像素值加权系数。

22. 发明授权

US09050003B2 Reconstruction computing device, reconstruction computing method, and X-ray CT apparatus 有权
标题翻译：重建计算装置，重建计算方法和X射线CT装置
公开(公告)号：US09050003B2
公开(公告)日：2015-06-09
申请号：US13635391
申请日：2011-03-29
申请人： Hisashi Takahashi , Taiga Goto , Koichi Hirokawa
发明人： Hisashi Takahashi , Taiga Goto , Koichi Hirokawa
IPC分类号： G06K9/00 , A61B6/03 , A61B6/00 , G06T11/00 , A61B6/06
CPC分类号： A61B6/032 , A61B6/06 , A61B6/5205 , G06T11/006 , G06T2211/424
摘要： In order to provide a reconstruction computing device, a reconstruction computing method, and an X-ray CT apparatus capable of improving the image quality while reducing the amount of computation when reconstructing an X-ray CT image using an iterative method, a reconstruction computing device 45 divides an initial image 50 reconstructed using an analytical method such as an FBP method into a bed region 51, an object region 52, and the other air region 53, sets reconstruction conditions including at least convergence conditions and a pixel size for each of the divided regions, updates estimation images by performing an iterative process, and fixes estimation images or forward projection data of a subset satisfying the convergence conditions until other subsets satisfy the convergence conditions.
摘要翻译：为了提供一种重建计算装置，重构计算方法和能够在使用迭代方法重建X射线CT图像的同时减少计算量的同时提高图像质量的X射线CT装置，重建计算装置将使用诸如FBP方法的分析方法重构的初始图像50划分到床区域51，对象区域52和另一空气区域53中，设置至少包括收敛条件和每个像素尺寸的像素尺寸的重建条件分割区域，通过执行迭代处理来更新估计图像，并且修正满足收敛条件的子集的估计图像或前向投影数据，直到其他子集满足收敛条件。

23. 发明申请

US20130177132A1 X-RAY CT APPARATUS AND IMAGE RECONSTRUCTION METHOD 有权
标题翻译： X射线CT设备和图像重建方法
公开(公告)号：US20130177132A1
公开(公告)日：2013-07-11
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
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 +βSR）的每个元素（步骤2）。然后，计算装置5计算矩阵I-α（SBTDA +βSR）的运算符范数‖I-α（SBTDA +βSR）‖（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）。

24. 发明申请

US20090257553A1 X-RAY CT APPARATUS AND IMAGE NOISE REDUCTION METHOD 审中-公开
标题翻译： X射线CT装置和图像噪声减少方法
公开(公告)号：US20090257553A1
公开(公告)日：2009-10-15
申请号：US12374161
申请日：2007-07-18
申请人： Taiga Goto , Koichi Hirokawa
发明人： Taiga Goto , Koichi Hirokawa
IPC分类号： H05G1/60
CPC分类号： G06T11/005 , A61B6/032
摘要： An X-ray CT apparatus that can obtain a tomogram having high spatial resolution without increasing the effect of system noise and dosage is provided. The X-ray CT apparatus has an X-ray source for emitting X-ray, an X-ray detector having plural X-ray detecting elements that detect X-ray transmitted through an examinee as attenuation data and are arranged in a channel direction, a data combining unit for combining attenuation data of plural X-ray detecting elements in the channel direction to obtain composite data, a data decomposing unit for decomposing composite data to obtain respective decomposition data of the plural X-ray detecting elements, and an image re-constructing unit for re-constructing an image of the examinee by using the decomposition data.
摘要翻译：提供了可以获得具有高空间分辨率而不增加系统噪声和剂量的影响的X射线CT装置。 X射线CT装置具有用于发射X射线的X射线源，具有多个X射线检测元件的X射线检测器，该X射线检测元件检测通过受检者发射的X射线作为衰减数据并沿通道方向排列，数据组合单元，用于组合在信道方向上的多个X射线检测元件的衰减数据以获得复合数据;数据分解单元，用于分解复合数据以获得多个X射线检测元件的各自的分解数据;以及图像恢复 - 构造单元，用于通过使用分解数据重新构造受检者的图像。

25. 发明授权

US07505550B2 Radiotomography apparatus 有权
标题翻译：放射摄影仪
公开(公告)号：US07505550B2
公开(公告)日：2009-03-17
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： A61B6/00
CPC分类号： G06T11/005 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/503 , A61B6/541 , G06T2211/412
摘要： A radiotomograph comprises radiation detecting means which applies radiation from a radiation source to a subject from many direction and detects radiation transmitted through the subject from the directions, a bed on which the subject lies and which can move the subject in the direction of the body axis of the subject, reconstruction parameter setting means which sets reconstruction parameters including the amount of movement of the bed in the direction of the body axis and used to reconstruct, an image of the subject, reconstruction view area calculating means which calculates the reconstruction view area for at least one data segment necessary for reconstruction calculation determined for each position in a space reconstructed according to the set reconstruction parameters, reference segment position setting means which sets a reference segment position in the calculated reconstruction view area according to a phase signal generated by dynamic state analysis of the subject, effective segment calculating means which calculates an effective segment from the data segment containing the set reference segment position using a predetermined weight function, and image creating means for creating an image by reconstructing the calculated effective segment. With this, a radiotomograph both having an improved time resolution and enabling reduced effective radiation exposure can be provided.
摘要翻译：放射图像仪包括辐射检测装置，其从多个方向向受检者施加辐射，并从被检者所在的方向上检测通过被检体的方向传播的辐射，并且可以沿着身体轴线的方向移动受检者重建参数设置装置，其重建参数，其包括床体在身体轴线方向上的运动量并用于重构对象的重建参数，重建视区计算装置，其计算重建视区，根据所设定的重建参数重建的空间中的每个位置确定重建计算所需的至少一个数据段，基准段位置设定装置，根据由动态生成的相位信号，在计算出的重建视区内设定基准段位置分析主题，效果 e段计算装置，其使用预定的权重函数从包含所述设置的参考段位置的数据段计算有效段;以及图像创建装置，用于通过重建所计算的有效段来创建图像。因此，可以提供具有改善的时间分辨率并且能够实现减少的有效辐射暴露的放射图像仪。

26. 发明申请

US20070126730A1 Image processing method, image processing device, computer aided detection, and method for filtering along the time axis 有权
标题翻译：图像处理方法，图像处理装置，计算机辅助检测和时间轴滤波方法
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。

27. 发明申请

US20090046833A1 X-RAY CT APPARATUS 失效
标题翻译： X射线CT装置
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）。

28. 发明申请

US20080273778A1 Image Reconstruction Method and Tomograph 有权
标题翻译：图像重建方法和图像
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。

29. 发明申请

US20070189436A1 Radiotomography apparatus 有权
标题翻译：放射摄影仪
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。

30. 发明申请

US20100014630A1 X-RAY CT APPARATUS 有权
标题翻译： X射线CT装置
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。

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