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公开(公告)号：US20090122952A1
公开(公告)日：2009-05-14
申请号：US12267101
申请日：2008-11-07
申请人： Akihiko Nishide , Kosuke Sasaki , Tetsuya Horiuchi
发明人： Akihiko Nishide , Kosuke Sasaki , Tetsuya Horiuchi
IPC分类号： A61B6/00
CPC分类号： A61B6/466 , A61B6/032 , A61B6/4085 , A61B6/488 , A61B6/542
摘要： The present invention provides an X-ray CT apparatus capable of obtaining each tomographic image indicative of X-ray tube voltage dependent information of a subject with the optimum image quality by less reduced exposure. The X-ray CT apparatus includes device for setting a plurality of X-ray tube voltages and sets imaging conditions used in the photography using the respective X-ray tube voltages in such a manner that respective image noise of tomographic images photographed at the X-ray tube voltages become substantially identical to one another. The setting of the imaging conditions is the setting of X-ray tube currents. The X-ray tube currents are set based on geometrical characteristic amounts of the subject determined from each scout image in such a manner that the respective image noise of the tomographic images photographed at the plurality of X-ray tube voltages become substantially identical to one another.
摘要翻译： 本发明提供一种X射线CT装置，其能够通过减少曝光减少获得指示具有最佳图像质量的被摄体的X射线管电压依赖信息的每个断层图像。 X射线CT装置包括用于设置多个X射线管电压的装置，并且使用各X射线管电压设置在摄影中使用的成像条件，使得在X射线管的电压下拍摄的断层图像的各自的图像噪声， 射线管电压彼此基本相同。 成像条件的设定是X射线管电流的设定。 X射线管电流基于从每个侦察图像确定的被摄体的几何特征量，以使得在多个X射线管电压下拍摄的断层图像的各自图像噪声彼此基本相同的方式来设定 。
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公开(公告)号：US07778381B2
公开(公告)日：2010-08-17
申请号：US12267101
申请日：2008-11-07
申请人： Akihiko Nishide , Kosuke Sasaki , Tetsuya Horiuchi
发明人： Akihiko Nishide , Kosuke Sasaki , Tetsuya Horiuchi
IPC分类号： A61B6/00
CPC分类号： A61B6/466 , A61B6/032 , A61B6/4085 , A61B6/488 , A61B6/542
摘要： The present invention provides an X-ray CT apparatus capable of obtaining each tomographic image indicative of X-ray tube voltage dependent information of a subject with the optimum image quality by less reduced exposure. The X-ray CT apparatus includes device for setting a plurality of X-ray tube voltages and sets imaging conditions used in the photography using the respective X-ray tube voltages in such a manner that respective image noise of tomographic images photographed at the X-ray tube voltages become substantially identical to one another. The setting of the imaging conditions is the setting of X-ray tube currents. The X-ray tube currents are set based on geometrical characteristic amounts of the subject determined from each scout image in such a manner that the respective image noise of the tomographic images photographed at the plurality of X-ray tube voltages become substantially identical to one another.
摘要翻译： 本发明提供一种X射线CT装置，其能够通过减少曝光减少获得指示具有最佳图像质量的被摄体的X射线管电压依赖信息的每个断层图像。 X射线CT装置包括用于设置多个X射线管电压的装置，并且使用各X射线管电压设置在摄影中使用的成像条件，使得在X射线管的电压下拍摄的断层图像的各自的图像噪声， 射线管电压彼此基本相同。 成像条件的设定是X射线管电流的设定。 X射线管电流基于从每个侦察图像确定的被摄体的几何特征量，以使得在多个X射线管电压下拍摄的断层图像的各自图像噪声彼此基本相同的方式来设定 。
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公开(公告)号：US20070286332A1
公开(公告)日：2007-12-13
申请号：US11757732
申请日：2007-06-04
摘要： The present invention aims to obtain a tomographic image similar in image quality to a tomographic image obtained by executing a scan at X-ray tube current value set by an X-ray automatic exposure function even when the X-ray tube current value set by the X-ray automatic exposure function are not within a standard range of the X-ray tube current values settable at the X-ray tube (21). X-ray tube current value supplied to the X-ray tube (21) are set by the X-ray automatic exposure function. Thereafter, when the X-ray tube current value set by the X-ray automatic exposure function is not within in the standard range of the X-ray tube current value settable at the X-ray tube, the X-ray tube current value at a portion not within the standard range are changed so as to be within the standard range, and the set value of helical pitch is changed so as to correspond to the ratio between the pre-changed x-ray tube current value and the post-changed X-ray tube current value.
摘要翻译： 本发明的目的在于获得与通过由X射线自动曝光功能设定的X射线管电流值执行扫描而获得的断层图像相似的断层图像，即使当由X射线管电流值 X射线自动曝光功能不在X射线管（21）可设定的X射线管电流值的标准范围内。 通过X射线自动曝光功能设定供给X射线管（21）的X射线管电流值。 此后，当通过X射线自动曝光功能设定的X射线管电流值不在可设置在X射线管的X射线管电流值的标准范围内时，X射线管电流值在 不在标准范围内的部分被改变为在标准范围内，并且改变螺距的设定值，以便对应于预先改变的X射线管电流值和后变化的X射线管电流值之间的比率 X射线管电流值。
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公开(公告)号：US20050254617A1
公开(公告)日：2005-11-17
申请号：US11124946
申请日：2005-05-09
申请人： Akihiko Nishide , Tetsuya Horiuchi
发明人： Akihiko Nishide , Tetsuya Horiuchi
CPC分类号： G06T5/002 , G06T5/50 , G06T11/005 , G06T11/008 , G06T2207/10081 , G06T2207/30004 , Y10S378/901
摘要： A method for reconstructing an image that can be recognized stably during CAD. The method for reconstructing an image on the basis of a plurality of views of projection data items provided by X-rays having passed through a subject includes image reconstruction dedicated to a computer-aided detection (CAD) mode. The image reconstruction comprises a reconstruction function dedicated to the CAD mode, includes pre-processing that includes a noise removal filter for removing a noise from projection data, such as, a streaky artifact removal dedicated to the CAD mode, and also includes post-processing that includes a noise removal filter dedicated to the CAD mode.
摘要翻译： 一种用于重建可在CAD中稳定识别的图像的方法。 基于通过被摄体的X射线提供的投影数据项的多个视图来重建图像的方法包括专用于计算机辅助检测（CAD）模式的图像重建。 图像重建包括专用于CAD模式的重建功能，包括预处理，包括用于从投影数据去除噪声的噪声去除滤波器，例如专用于CAD模式的条纹伪像去除，并且还包括后处理 其包括专用于CAD模式的噪声去除滤波器。
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公开(公告)号：US07082181B2
公开(公告)日：2006-07-25
申请号：US11124946
申请日：2005-05-09
申请人： Akihiko Nishide , Tetsuya Horiuchi
发明人： Akihiko Nishide , Tetsuya Horiuchi
IPC分类号： A61B6/00
CPC分类号： G06T5/002 , G06T5/50 , G06T11/005 , G06T11/008 , G06T2207/10081 , G06T2207/30004 , Y10S378/901
摘要： A method for reconstructing an image that can be recognized stably during CAD. The method for reconstructing an image on the basis of a plurality of views of projection data items provided by X-rays having passed through a subject includes image reconstruction dedicated to a computer-aided detection (CAD) mode. The image reconstruction comprises a reconstruction function dedicated to the CAD mode, includes pre-processing that includes a noise removal filter for removing a noise from projection data, such as, a streaky artifact removal dedicated to the CAD mode, and also includes post-processing that includes a noise removal filter dedicated to the CAD mode.
摘要翻译： 一种用于重建可在CAD中稳定识别的图像的方法。 基于通过被摄体的X射线提供的投影数据项的多个视图来重建图像的方法包括专用于计算机辅助检测（CAD）模式的图像重建。 图像重建包括专用于CAD模式的重建功能，包括预处理，包括用于从投影数据去除噪声的噪声去除滤波器，例如专用于CAD模式的条纹伪像去除，并且还包括后处理 其包括专用于CAD模式的噪声去除滤波器。
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公开(公告)号：US20050008116A1
公开(公告)日：2005-01-13
申请号：US10885189
申请日：2004-07-06
摘要： An object of the present invention is to utilize a distance, which is linearly moved for acceleration or deceleration, out of an overall distance linearly moved during a helical scan for the purpose of image reconstruction. Projection data is acquired even during acceleration or deceleration of linear movement made for a helical scan. The acquired projection data is utilized for image reconstruction. Moreover, during the acceleration of linear movement, while a tube current is being increased, projection data is acquired. During the deceleration of linear movement, while the tube current is being decreased, projection data is acquired.
摘要翻译： 为了图像重构的目的，本发明的目的是利用在螺旋扫描过程中线性移动的整个距离内的加速或减速线性移动的距离。 甚至在进行螺旋扫描的线性运动的加速或减速期间也获取投影数据。 获取的投影数据被用于图像重建。 此外，在线性运动的加速期间，当管电流增加时，获取投影数据。 在线性运动减速期间，当管电流减小时，获取投影数据。
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公开(公告)号：US07639776B2
公开(公告)日：2009-12-29
申请号：US11757732
申请日：2007-06-04
IPC分类号： A61B6/00
摘要： The present invention aims to obtain a tomographic image similar in image quality to a tomographic image obtained by executing a scan at X-ray tube current value set by an X-ray automatic exposure function even when the X-ray tube current value set by the X-ray automatic exposure function are not within a standard range of the X-ray tube current values settable at the X-ray tube (21). X-ray tube current value supplied to the X-ray tube (21) are set by the X-ray automatic exposure function. Thereafter, when the X-ray tube current value set by the X-ray automatic exposure function is not within in the standard range of the X-ray tube current value settable at the X-ray tube, the X-ray tube current value at a portion not within the standard range are changed so as to be within the standard range, and the set value of helical pitch is changed so as to correspond to the ratio between the pre-changed x-ray tube current value and the post-changed X-ray tube current value.
摘要翻译： 本发明的目的在于获得与通过由X射线自动曝光功能设定的X射线管电流值执行扫描而获得的断层图像相似的断层图像，即使当由X射线管电流值 X射线自动曝光功能不在X射线管（21）可设定的X射线管电流值的标准范围内。 通过X射线自动曝光功能设定供给X射线管（21）的X射线管电流值。 此后，当通过X射线自动曝光功能设定的X射线管电流值不在可设置在X射线管的X射线管电流值的标准范围内时，X射线管电流值在 不在标准范围内的部分被改变为在标准范围内，并且改变螺距的设定值，以便对应于预先改变的X射线管电流值和后变化的X射线管电流值之间的比率 X射线管电流值。
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公开(公告)号：US20070019851A1
公开(公告)日：2007-01-25
申请号：US11489969
申请日：2006-07-20
IPC分类号： G06K9/00
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/412
摘要： The present invention is intended to improve the quality of a four-dimensional image that is a time-varying three-dimensional image. The four-dimensional image that is a time-varying three-dimensional image is spatially filtered in the direction of a time axis and the directions of spatial axes alike.
摘要翻译： 本发明旨在提高作为时变三维图像的四维图像的质量。 作为时变三维图像的四维图像在时间轴的方向和空间轴的方向上进行空间滤波。
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公开(公告)号：US20070053480A1
公开(公告)日：2007-03-08
申请号：US11507763
申请日：2006-08-22
申请人： Akihiko Nishide , Tetsuya Horiuchi , Yasuhiro Imai
发明人： Akihiko Nishide , Tetsuya Horiuchi , Yasuhiro Imai
CPC分类号： A61B6/00 , A61B6/027 , A61B6/032 , A61B6/542 , A61B6/583 , G01N23/046 , G01N2223/419 , G01N2223/612
摘要： This invention provides an X-ray CT capable of presenting information of exposure to the operator by displaying X-ray dose information of each of regions of interest to be scanned by an X-ray CT apparatus, thereby encouraging reduction in exposure and optimization. X-ray dose information of each region to be scanned by a conventional scan (axial scan), a cine scan, a helical scan, or a variable-pitch helical scan of an X-ray CT apparatus is displayed so that the operator can recognize the X-ray dose information before acquisition of an image of a subject. The X-ray dose information can be predicated with higher precision and displayed by using a dose prediction value obtained by an interpolation value and an extrapolation value of the first or higher order on at least three or more kinds of phantom measurement values, not a simple prediction value such as a zero-th order interpolation value or a zero-th order extrapolation value obtained by using measurement values of two kinds of phantoms like in the present CTDI display.
摘要翻译： 本发明提供一种能够通过显示由X射线CT装置扫描的每个感兴趣区域的X射线剂量信息来呈现对操作者的曝光信息的X射线CT，由此有助于减少曝光和优化。 通过X射线CT装置的常规扫描（轴向扫描），电影扫描，螺旋扫描或可变间距螺旋扫描来显示要扫描的每个区域的X射线剂量信息，使得操作者可以识别 在获取对象的图像之前的X射线剂量信息。 X射线剂量信息可以更精确地预测并且通过使用通过内插值获得的剂量预测值和在至少三种或更多种幻影测量值上的第一或更高阶的外推值来显示，而不是简单的 例如通过使用如本CTDI显示中的两种类型的幻影的测量值而获得的零级内插值或零级外插值等预测值。
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公开(公告)号：US07756240B2
公开(公告)日：2010-07-13
申请号：US11956813
申请日：2007-12-14
申请人： Akihiko Nishide , Makoto Gohno
发明人： Akihiko Nishide , Makoto Gohno
IPC分类号： A61B6/00
CPC分类号： A61B6/405 , A61B6/027 , A61B6/4035 , A61B6/542 , A61B6/583
摘要： The present invention provides an X-ray CT apparatus capable of improving image quality of a dual energy image. The X-ray CT apparatus comprises an X-ray tube for applying X rays having a first energy spectrum and X rays having a second energy spectrum different from the first energy spectrum to a subject, an X-ray data acquisition unit for acquiring X-ray projection data of the first energy spectrum projected onto the subject and X-ray projection data of the second energy spectrum projected thereonto, dual energy image reconstructing unit for image-reconstructing tomographic images indicative of X-ray tube voltage-dependent information at X-ray absorption coefficients related to a distribution of atoms, based on the X-ray projection data of the first energy spectrum and the X-ray projection data of the second energy spectrum, and adjusting unit for adjusting conditions for the image reconstruction in order to optimize the tomographic images indicative of the X-ray tube voltage-dependent information.
摘要翻译： 本发明提供能够提高双能量图像的图像质量的X射线CT装置。 X射线CT装置包括：X射线管，用于将具有第一能谱的X射线和具有与第一能谱不同的第二能谱的X射线施加到被检体; X射线数据获取单元， 投影到被摄体上的第一能量谱的射线投影数据和投射到其上的第二能量谱的X射线投影数据，双能量图像重建单元，用于将X射线管电压依赖信息的X射线管电压依赖性信息进行图像重建， 基于第一能谱的X射线投影数据和第二能谱的X射线投影数据的与原子分布相关的射线吸收系数，以及用于调整图像重建的条件的调整单元，以优化 所述断层图像指示所述X射线管电压依赖性信息。
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