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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：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：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：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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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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