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公开(公告)号：US08971607B2
公开(公告)日：2015-03-03
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
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）。
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公开(公告)号：US20140193055A1
公开(公告)日：2014-07-10
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： 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。
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3.发明申请RECONSTRUCTION COMPUTING DEVICE, RECONSTRUCTION COMPUTING METHOD, AND X-RAY CT APPARATUS 有权重建计算设备，重建计算方法和X射线CT设备公开(公告)号：US20130028500A1
公开(公告)日：2013-01-31
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
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 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方法的分析方法重建的初始图像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的重建条件和分割的每个的像素大小 区域，通过执行迭代处理更新估计图像，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。
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4.发明授权Image reconstruction device and image reconstruction method configured to perform iteratively reconstructed image using weight coefficient 有权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
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。
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5.发明授权Medical image processing device and medical image processing method, applying weighted penalty term in iterative approximation 有权医学图像处理装置和医学图像处理方法，迭代近似应用加权惩罚项公开(公告)号：US09123098B2
公开(公告)日：2015-09-01
申请号：US14112276
申请日：2012-04-04
CPC分类号： G06T7/0012 , A61B6/032 , A61B6/5205 , A61B6/5258 , A61B6/583 , G06T5/002 , G06T11/006 , G06T2207/10081 , G06T2207/20182 , G06T2207/30004 , G06T2211/424
摘要： With respect to projection data covering a plurality of sites, in order to create a medical image in which a uniform noise reduction effect is achieved for all sites within the projection data, an arithmetic device (5) determines one or more of proper subsets on the basis of scanning conditions and reconstruction conditions (step 2). Next, the arithmetic device (5) calculates a penalty-term weight for each proper subset on the basis of a detector output weight corresponding to a set element contained in the proper subset (step 3). Then, the arithmetic unit (5) performs an iterative approximation by using the penalty-term weight for each proper subset (step 4).
摘要翻译： 关于覆盖多个位置的投影数据，为了创建其中对投影数据内的所有位置实现均匀的降噪效果的医学图像，运算装置（5）确定一个或多个适当的子集， 扫描条件和重建条件的基础（步骤2）。 接下来，算术装置（5）基于与包含在适当子集中的集合元素相对应的检测器输出权重来计算每个适当子集的惩罚项权重（步骤3）。 然后，算术单元（5）通过使用每个适当子集的惩罚项权重来执行迭代近似（步骤4）。
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6.发明授权Reconstruction computing device, reconstruction computing method, and X-ray CT apparatus 有权重建计算装置，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
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。
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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
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）。
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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
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）。
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公开(公告)号：US20140226887A1
公开(公告)日：2014-08-14
申请号：US14112276
申请日：2012-04-04
CPC分类号： G06T7/0012 , A61B6/032 , A61B6/5205 , A61B6/5258 , A61B6/583 , G06T5/002 , G06T11/006 , G06T2207/10081 , G06T2207/20182 , G06T2207/30004 , G06T2211/424
摘要： With respect to projection data covering a plurality of sites, in order to create a medical image in which a uniform noise reduction effect is achieved for all sites within the projection data, an arithmetic device (5) determines one or more of proper subsets on the basis of scanning conditions and reconstruction conditions (step 2). Next, the arithmetic device (5) calculates a penalty-term weight for each proper subset on the basis of a detector output weight corresponding to a set element contained in the proper subset (step 3). Then, the arithmetic unit (5) performs an iterative approximation by using the penalty-term weight for each proper subset (step 4).
摘要翻译： 关于覆盖多个位置的投影数据，为了创建其中对投影数据内的所有位置实现均匀的降噪效果的医学图像，运算装置（5）确定一个或多个适当的子集， 扫描条件和重建条件的基础（步骤2）。 接下来，算术装置（5）基于与包含在适当子集中的集合元素相对应的检测器输出权重来计算每个适当子集的惩罚项权重（步骤3）。 然后，算术单元（5）通过使用每个适当子集的惩罚项权重来执行迭代近似（步骤4）。
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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）。
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