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公开(公告)号：US06628744B1
公开(公告)日：2003-09-30
申请号：US10256059
申请日：2002-09-26
IPC分类号： A61B603
CPC分类号： A61B6/032 , A61B6/4021 , A61B6/4291 , G06T11/005 , Y10S378/901
摘要： A third generation CT scanner includes a rotating x-ray source (18) and a detector array (16). Each sampling of the detector array generates a source fan data line of data values that are converted (34) to attenuation values in a logarithmic domain and subject to preliminary corrections (36). Attenuation values from a plurality of adjoining source fans are converted (94) back to a non-logarithmic domain as intensity values. A corresponding deconvolution function (88) from a deconvolution function look-up table (90) corresponding to the detector whose intensity value is being corrected is deconvolved with a line (84) of the intensity values which spans a plurality of adjoining source fan data lines to remove the intensity attributable to off-focal radiation (30). The intensity data is converted (102) back into attenuation values in the logarithmic domain and reconstructed (106) into an image representation for display on a monitor (112).
摘要翻译： 第三代CT扫描仪包括旋转X射线源（18）和检测器阵列（16）。 检测器阵列的每个采样产生一个数据值的源风扇数据线，其数据值被转换（34）到对数域中的衰减值，并进行初步校正（36）。 来自多个邻接的源风扇的衰减值被转换（94）回到非对数域作为强度值。 来自与强度值正在被校正的检测器对应的反卷积函数查找表（90）的对应的去卷积函数（88）用跨越多个邻接的源风扇数据线的强度值的线（84）去卷积 以消除归因于非焦距辐射的强度（30）。 将强度数据（102）转换回对数域中的衰减值，并将其重建（106）成为用于在监视器（112）上显示的图像表示。
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公开(公告)号：US07983385B2
公开(公告)日：2011-07-19
申请号：US12441916
申请日：2007-09-11
IPC分类号： A61B6/00
CPC分类号： A61B6/4085 , A61B6/027 , A61B6/032 , A61B6/06 , A61B6/4028 , A61B6/541
摘要： A computed tomography system (100) includes an x-ray source (112) that rotates about an examination region (108) and translates along a longitudinal axis (120). The x-ray source (112) remains at a first location on the longitudinal axis (120) while rotating about the examination region (108), accelerates to a scanning speed and performs a fly-by scan of a region of interest (220) in which at least one hundred and eighty degrees plus a fan angle of data is acquired. At least one detector (124) detects x-rays radiated by the x-ray source (112) that traverses the examination region (108) and generates signals indicative thereof. A reconstructor (132) reconstructs the signals to generate volumetric image data.
摘要翻译： 计算机断层摄影系统（100）包括围绕检查区域（108）旋转并沿着纵向轴线（120）平移的x射线源（112）。 当围绕检查区域（108）旋转时，X射线源（112）保持在纵向轴线（120）上的第一位置，加速到扫描速度并执行感兴趣区域（220）的飞越扫描， 其中至少有一百八十度加上数据的扇角。 至少一个检测器（124）检测穿过检查区域（108）的x射线源（112）辐射的X射线，并产生指示其的信号。 重建器（132）重建信号以产生体积图像数据。
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公开(公告)号：US20090238327A1
公开(公告)日：2009-09-24
申请号：US12441916
申请日：2007-09-11
CPC分类号： A61B6/4085 , A61B6/027 , A61B6/032 , A61B6/06 , A61B6/4028 , A61B6/541
摘要： A computed tomography system (100) includes an x-ray source (112) that rotates about an examination region (108) and translates along a longitudinal axis (120). The x-ray source (112) remains at a first location on the longitudinal axis (120) while rotating about the examination region (108), accelerates to a scanning speed and performs a fly-by scan of a region of interest (220) in which at least one hundred and eighty degrees plus a fan angle of data is acquired. At least one detector (124) detects x-rays radiated by the x-ray source (112) that traverses the examination region (108) and generates signals indicative thereof. A reconstructor (132) reconstructs the signals to generate volumetric image data.
摘要翻译： 计算机断层摄影系统（100）包括围绕检查区域（108）旋转并沿着纵向轴线（120）平移的x射线源（112）。 当围绕检查区域（108）旋转时，X射线源（112）保持在纵向轴线（120）上的第一位置，加速到扫描速度并执行感兴趣区域（220）的飞越扫描， 其中至少有一百八十度加上数据的扇角。 至少一个检测器（124）检测穿过检查区域（108）的x射线源（112）辐射的X射线，并产生指示其的信号。 重建器（132）重建信号以产生体积图像数据。
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