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公开(公告)号：US09508142B2
公开(公告)日：2016-11-29
申请号：US14422788
申请日：2013-08-07
CPC分类号： G06T7/0012 , A61B6/03 , A61B6/4233 , A61B6/5258 , G01N23/046 , G06T5/005 , G06T2207/10081 , G06T2207/30004
摘要： An X-ray detector (320), configured to have X-ray detecting elements (322) arranged in array, detects the intensity of X-rays that are radiated from the X-ray tube (311) and have passed through a subject (500). A data processing device (420) executes steps of: arranging scan data, which is based on the intensity of X-rays, in an array sequence of the X-ray detecting elements (322) or in a time sequence, to detect an anomalous scan data; associating a weight greater than “1” with scan data adjacent to the anomalous scan data, and associating a weight of “1” with other imaging data; calculating an update amount of a pixel vector that reflects these weights; and performing an iterative operation using the update amount to generate an X-ray CT image of the subject (500).
摘要翻译： 被配置为具有排列成阵列的X射线检测元件（322）的X射线检测器（320），检测从X射线管（311）辐射并穿过被检体的X射线的强度（ 500）。 数据处理装置（420）执行以下步骤：将基于X射线强度的扫描数据排列在X射线检测元件（322）的阵列序列中，或者按时间顺序排列，以检测异常 扫描数据; 将大于“1”的重量与与异常扫描数据相邻的扫描数据相关联，并将“1”的权重与其他成像数据相关联; 计算反映这些权重的像素向量的更新量; 以及使用所述更新量执行迭代操作以生成所述对象（500）的X射线CT图像。
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公开(公告)号：US20150221085A1
公开(公告)日：2015-08-06
申请号：US14422788
申请日：2013-08-07
CPC分类号： G06T7/0012 , A61B6/03 , A61B6/4233 , A61B6/5258 , G01N23/046 , G06T5/005 , G06T2207/10081 , G06T2207/30004
摘要： An X-ray detector (320), configured to have X-ray detecting elements (322) arranged in array, detects the intensity of X-rays that are radiated from the X-ray tube (311) and have passed through a subject (500). A data processing device (420) executes steps of arranging scan data, which is based on the intensity of X-rays, in an array sequence of the X-ray detecting elements (322) or in a time sequence, to detect an anomalous scan data; associating a weight greater than “1” with scan data adjacent to the anomalous scan data, and associating a weight of “1” with other imaging data; calculating an update amount of a pixel vector that reflects these weights; and performing an iterative operation using the update amount to generate an X-ray CT image of the subject (500).
摘要翻译： 被配置为具有排列成阵列的X射线检测元件（322）的X射线检测器（320），检测从X射线管（311）辐射并穿过被检体的X射线的强度（ 500）。 数据处理装置（420）执行将X射线强度的扫描数据排列在X射线检测元件（322）的阵列序列中，或按时间顺序进行的步骤，以检测异常扫描 数据; 将大于“1”的重量与与异常扫描数据相邻的扫描数据相关联，并将“1”的权重与其他成像数据相关联; 计算反映这些权重的像素向量的更新量; 以及使用所述更新量执行迭代操作以生成所述对象（500）的X射线CT图像。
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公开(公告)号：US20130108009A1
公开(公告)日：2013-05-02
申请号：US13701232
申请日：2011-06-03
申请人： Shinichi Kojima , Fumito Watanabe , Yasutaka Konno , Yushi Tsubota , Yukiko Ueki
IPC分类号： G01N23/04
CPC分类号： G01N23/046 , A61B6/032 , A61B6/5205 , A61B6/5258 , A61B6/5282 , A61B6/583 , A61B6/585
摘要： An X-ray CT apparatus includes: an X-ray generating unit configured to generate an X ray; an X-ray detecting unit including a plurality of X-ray detectors, each configured to detect the X ray generated from the X-ray generating unit and transmitted through an object; and an image generating unit configured to correct and reconstruct signals acquired by the X-ray detecting unit. While crosstalk correction of a plurality of the X-ray detectors is performed at the image generating unit, correction of a locally attenuating component is previously performed and correction of a whole component of the crosstalk is performed when the image is reconstructed.
摘要翻译： X射线CT装置包括：X射线产生单元，被配置为产生X射线; X射线检测单元，其包括多个X射线检测器，每个X射线检测器被配置为检测从X射线产生单元产生并透过物体的X射线; 以及图像生成单元，被配置为校正和重建由所述X射线检测单元获取的信号。 虽然在图像生成单元执行多个X射线检测器的串扰校正，但是预先执行局部衰减分量的校正，并且当重构图像时执行串扰的整个分量的校正。
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公开(公告)号：US09482629B2
公开(公告)日：2016-11-01
申请号：US13701232
申请日：2011-06-03
申请人： Shinichi Kojima , Fumito Watanabe , Hironori Ueki , Yasutaka Konno , Yushi Tsubota , Yukiko Ueki
IPC分类号： G01N23/083 , G01N23/04 , A61B6/03 , A61B6/00
CPC分类号： G01N23/046 , A61B6/032 , A61B6/5205 , A61B6/5258 , A61B6/5282 , A61B6/583 , A61B6/585
摘要： An X-ray CT apparatus includes: an X-ray generating unit configured to generate an X ray; an X-ray detecting unit including a plurality of X-ray detectors, each configured to detect the X ray generated from the X-ray generating unit and transmitted through an object; and an image generating unit configured to correct and reconstruct signals acquired by the X-ray detecting unit. While crosstalk correction of a plurality of the X-ray detectors is performed at the image generating unit, correction of a locally attenuating component is previously performed and correction of a whole component of the crosstalk is performed when the image is reconstructed.
摘要翻译： X射线CT装置包括：X射线产生单元，被配置为产生X射线; X射线检测单元，其包括多个X射线检测器，每个X射线检测器被配置为检测从X射线产生单元产生并透过物体的X射线; 以及图像生成单元，被配置为校正和重建由所述X射线检测单元获取的信号。 虽然在图像生成单元执行多个X射线检测器的串扰校正，但是预先执行局部衰减分量的校正，并且当重构图像时执行串扰的整个分量的校正。
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公开(公告)号：US09380987B2
公开(公告)日：2016-07-05
申请号：US14364257
申请日：2012-12-12
CPC分类号： A61B6/4266 , A61B6/032 , A61B6/4021 , A61B6/4208 , A61B6/4291 , A61B6/467 , A61B6/5205 , A61B6/5282 , A61B6/54 , G01T1/2002 , G01T1/243
摘要： In order to suppress reduction in sensitivity when acquiring high-resolution data, an X-ray CT device is provided with an X-ray source that irradiates a patient with X-rays, and an X-ray detector that detects the X-rays. The X-ray detector includes a plurality of detection elements (scintillators and photodiodes) arrayed in a first direction, and a plurality of separators that separate the detection elements arrayed in the first direction respectively from each other. The separators each have a first-direction width which is a width in the first direction, first-direction widths of some separators each arrayed every predetermined number of separators being different from first-direction widths of the other separators.
摘要翻译： 为了抑制获取高分辨率数据时的灵敏度降低，对X射线CT装置设置有X射线照射患者的X射线源和检测X射线的X射线检测器。 X射线检测器包括沿第一方向排列的多个检测元件（闪烁体和光电二极管），以及将沿第一方向排列的检测元件彼此分离的多个分离器。 分离器各自具有作为第一方向的宽度的第一方向宽度，每隔预定数量的分隔件排列的一些隔板的第一方向宽度与其他隔板的第一方向宽度不同。
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公开(公告)号：US20150190106A1
公开(公告)日：2015-07-09
申请号：US14408576
申请日：2013-07-12
发明人： Keisuke Yamakawa , Shinichi Kojima
CPC分类号： A61B6/5235 , A61B6/032 , A61B6/465 , A61B6/5205 , A61B6/5258 , G06T11/005 , G06T2207/10081 , G06T2207/20182 , G06T2211/424
摘要： The present invention is directed to improve the precision of a CT image of a local region (small FOV image) that is obtained by applying the extensive reconstruction technique to the iterative approximate reconstruction method. A first CT image relating to a first reconstruction range is reconstructed from the projection data of a subject, the projection data being detected by the X-ray detector of the X-ray CT apparatus, and the first CT image is corrected iteratively so that the first calculated projection data obtained from the first CT image according to projection calculation, becomes equal to the projection data of the subject. The first CT image thus iteratively corrected is used to extract local measured projection data in association with the second reconstruction range. A second CT image is reconstructed in the second reconstruction range and the second CT image is iteratively corrected so that the extracted local measured projection data becomes equal to the second calculated projection data that is obtained from the second CT image according to the projection calculation.
摘要翻译： 本发明旨在提高通过将广泛重建技术应用于迭代近似重建方法获得的局部区域（小FOV图像）的CT图像的精度。 从对象的投影数据重建与第一重建范围有关的第一CT图像，投影数据由X射线CT装置的X射线检测器检测，并且第一CT图像被迭代地校正，使得 根据投影计算从第一CT图像获得的第一计算投影数据变得等于被摄体的投影数据。 由此迭代校正的第一CT图像与第二重建范围相关联地提取局部测量投影数据。 在第二重建范围中重构第二CT图像，并且迭代地校正第二CT图像，使得提取的局部测量投影数据等于根据投影计算从第二CT图像获得的第二计算投影数据。
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公开(公告)号：US09307949B2
公开(公告)日：2016-04-12
申请号：US14364278
申请日：2012-12-12
CPC分类号： A61B6/5282 , A61B6/032 , A61B6/4291 , A61B6/5205 , A61B6/583 , G01N23/046 , G06T11/005 , G06T2211/416
摘要： It is an object to prevent a poor X-ray CT image due to scattered X-rays. An X-ray CT scanner (100) uses an X-ray detector (4), etc., to scan (F1) an object (3) to obtain X-ray transmission image data, and estimate (F3) an X-ray absorption coefficient distribution inside the object (3) based on the scanned X-ray transmission image data. Next, the X-ray CT scanner (100) performs a Monte Carlo simulation on a simulated object (3) having the X-ray absorption coefficient distribution estimated, and estimates (F4 and F7) a point spread function or scattered X-ray distribution derived from the object. Then, the X-ray CT scanner (100) corrects (F5 and F8), based on the point spread function or scattered X-ray distribution estimated, the X-ray transmission image data, and finally creates (F6 and F9) an image of the X-ray absorption coefficient distribution of the object (3).
摘要翻译： 本发明的目的是防止由于X射线散射引起的X射线CT图像不良。 X射线CT扫描仪（100）使用X射线检测器（4）等来扫描（F1）物体（3）以获得X射线透射图像数据，并且估计（F3）X射线 基于扫描的X射线透射图像数据，物体（3）内部的吸收系数分布。 接下来，X射线CT扫描器（100）对估计出X射线吸收系数分布的模拟对象（3）进行蒙特卡罗模拟，并且估计（F4和F7）点扩散函数或散射X射线分布 从对象派生。 然后，X射线CT扫描器（100）基于点扩散函数或估计的散射X射线分布来校正（F5和F8）X射线透射图像数据，并最终创建（F6和F9）图像 的物体（3）的X射线吸收系数分布。
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公开(公告)号：US20140321610A1
公开(公告)日：2014-10-30
申请号：US14364257
申请日：2012-12-12
CPC分类号： A61B6/4266 , A61B6/032 , A61B6/4021 , A61B6/4208 , A61B6/4291 , A61B6/467 , A61B6/5205 , A61B6/5282 , A61B6/54 , G01T1/2002 , G01T1/243
摘要： In order to suppress reduction in sensitivity when acquiring high-resolution data, an X-ray CT device is provided with an X-ray source that irradiates a patient with X-rays, and an X-ray detector that detects the X-rays. The X-ray detector includes a plurality of detection elements (scintillators and photodiodes) arrayed in a first direction, and a plurality of separators that separate the detection elements arrayed in the first direction respectively from each other. The separators each have a first-direction width which is a width in the first direction, first-direction widths of some separators each arrayed every predetermined number of separators being different from first-direction widths of the other separators.
摘要翻译： 为了抑制获取高分辨率数据时的灵敏度降低，对X射线CT装置设置有X射线照射患者的X射线源和检测X射线的X射线检测器。 X射线检测器包括沿第一方向排列的多个检测元件（闪烁体和光电二极管），以及将沿第一方向排列的检测元件彼此分离的多个分离器。 分离器各自具有作为第一方向的宽度的第一方向宽度，每隔预定数量的分隔件排列的一些隔板的第一方向宽度与其他隔板的第一方向宽度不同。
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公开(公告)号：US09552659B2
公开(公告)日：2017-01-24
申请号：US14655589
申请日：2014-01-15
CPC分类号： G06T11/005 , A61B6/032 , A61B6/4021 , A61B6/5205 , G06T11/006 , G06T2207/10016 , G06T2207/10081 , G06T2207/10148 , G06T2207/30004 , G06T2211/40
摘要： Difference of resolution depending on imaging position in one reconstructed image generated in the FFS method is reduced to improve measurement accuracy. The X-ray CT device interpolates missing data of the projection data obtained by the FFS method with view direction interpolation processing using real data of the projection data lining up along the angular direction of the rotational movement, and channel direction interpolation processing using real data of the projection data lining up along the channel direction, and generates a reconstructed image, in which contribution ratios of the projection data having been subjected to the view direction interpolation processing and the projection data having been subjected to the channel direction interpolation processing differ according to position of pixel in the reconstructed image.
摘要翻译： 根据在FFS方法中生成的一个重建图像中的成像位置的分辨率的差异被减小以提高测量精度。 X射线CT装置使用利用旋转运动的角度方向排列的投影数据的实数的视场方向插值处理，对通过FFS方法获得的投影数据的丢失数据进行插值，使用实际数据 所述投影数据沿着所述通道方向排列起来，并且生成重构图像，其中已经进行了视图方向内插处理的投影数据和经过所述频道方向插值处理的投影数据的贡献率根据位置而不同 的重建图像中的像素。
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公开(公告)号：US09420986B2
公开(公告)日：2016-08-23
申请号：US14408576
申请日：2013-07-12
发明人： Keisuke Yamakawa , Shinichi Kojima
CPC分类号： A61B6/5235 , A61B6/032 , A61B6/465 , A61B6/5205 , A61B6/5258 , G06T11/005 , G06T2207/10081 , G06T2207/20182 , G06T2211/424
摘要： The present invention is directed to improve the precision of a CT image of a local region (small FOV image) that is obtained by applying the extensive reconstruction technique to the iterative approximate reconstruction method. A first CT image relating to a first reconstruction range is reconstructed from the projection data of a subject, the projection data being detected by the X-ray detector of the X-ray CT apparatus, and the first CT image is corrected iteratively so that the first calculated projection data obtained from the first CT image according to projection calculation, becomes equal to the projection data of the subject. The first CT image thus iteratively corrected is used to extract local measured projection data in association with the second reconstruction range. A second CT image is reconstructed in the second reconstruction range and the second CT image is iteratively corrected so that the extracted local measured projection data becomes equal to the second calculated projection data that is obtained from the second CT image according to the projection calculation.
摘要翻译： 本发明旨在提高通过将广泛重建技术应用于迭代近似重建方法获得的局部区域（小FOV图像）的CT图像的精度。 从对象的投影数据重建与第一重建范围有关的第一CT图像，投影数据由X射线CT装置的X射线检测器检测，并且第一CT图像被迭代地校正，使得 根据投影计算从第一CT图像获得的第一计算投影数据变得等于被摄体的投影数据。 由此迭代校正的第一CT图像与第二重建范围相关联地提取局部测量投影数据。 在第二重建范围中重构第二CT图像，并且迭代地校正第二CT图像，使得提取的局部测量投影数据等于根据投影计算从第二CT图像获得的第二计算投影数据。
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