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11.发明授权Correction algorithm for bone-induced spectral artifacts in computed tomograph imaging 失效计算机断层成像中骨诱导光谱伪影的校正算法
公开(公告)号：US6115487A
公开(公告)日：2000-09-05
申请号：US4397
申请日：1998-01-08
申请人： Thomas L. Toth , Guy M. Besson , Jiang Hsieh , Tin-Su Pan
发明人： Thomas L. Toth , Guy M. Besson , Jiang Hsieh , Tin-Su Pan
CPC分类号： A61B6/583 , G01N23/046 , A61B6/027 , G01N2223/419 , Y10S378/901
摘要： A spectral correction algorithm for correcting dense object-induced spectral artifacts is described. In one embodiment, a calibration object, representative of typical head scanning conditions is scanned and the data reconstructed to provide an image. A water or water-equivalent cylinder of about the same diameter also is scanned and reconstructed, on the same display field of view (DFOV). These two images are designated respectively by BWEQ and WEQ. The ratio of images BWEQ and WEQ is then evaluated, and a region of interest extracted by multiplying the ratio by a function II(r), to obtain a calibration pattern CP. The calibration pattern is then averaged in azimuth to obtain a calibration vector. This calibration vector is fitted with low--order polynomial, and then divided by the fitting polynomial, to take out from the vector the low frequency components that, for instance, would be introduced on an "ideal" scanner. By subtracting 1.0 from the ratio, and multiplying by a CT number scale factor (ctscale) and an apodizing window Aw(r), a calibration error vector CEV is obtained that is representative of the circularly symmetric image error introduced by the non-corrected bone-induced artifact. The corresponding error calibration vector can be expanded into a circularly symmetric image error pattern I[CEV(r)], and subtracted from the calibration image, to provide a substantially artifact free image. The method can be extended to extract and correlate error vectors on an image segment basis such that the resulting error image pattern is not circularly symmetric.
摘要翻译： 描述了用于校正致密物体感应光谱伪影的光谱校正算法。 在一个实施例中，代表典型头部扫描条件的校准对象被扫描，并且重建数据以提供图像。 在相同的显示视野（DFOV）上也扫描和重构大约相同直径的水或水当量圆柱体。 这两个图像分别由BWEQ和WEQ指定。 然后评估图像BWEQ和WEQ的比率，并且通过将该比率乘以函数II（r）而提取的感兴趣区域以获得校准图案CP。 然后将校准图案在方位平均，以获得校准矢量。 该校准矢量装配有低阶多项式，然后用拟合多项式除以从矢量中取出例如将在“理想”扫描仪上引入的低频分量。 通过从该比值中减去1.0，乘以CT数比例因子（ctscale）和变迹窗口Aw（r），获得代表由未校正骨引入的圆对称图像误差的校准误差向量CEV 诱导的神器。 相应的误差校准矢量可以扩展成圆对称图像误差模式I [CEV（r）]，并从校准图像中减去，以提供基本上无伪影的图像。 该方法可以扩展以在图像片段上提取和关联错误矢量，使得所得到的误差图像图案不是圆对称的。
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公开(公告)号：US6061419A
公开(公告)日：2000-05-09
申请号：US139833
申请日：1998-08-25
申请人： Jiang Hsieh , Thomas L. Toth
发明人： Jiang Hsieh , Thomas L. Toth
IPC分类号： A61B6/03
CPC分类号： A61B6/4085 , A61B6/032 , Y10S378/901
摘要： Methods and apparatus for performing channel dependent and gain dependent smoothing filter (across channels) to compensate for noise in a multislice imaging system are described. The smoothing mainly affects the radial resolution. The filter can be combined with the matrix deconvolution filter typically used in multi-slice scanners. The filter is channel and DAS gain dependent and provides that an image generated from data collected in a multi-slice scan has about the same image quality, e.g., noise reduction, as images generated by other types of scanners.
摘要翻译： 描述了用于执行通道相关和增益依赖的平滑滤波器（跨通道）以补偿多层成像系统中的噪声的方法和装置。 平滑主要影响径向分辨率。 滤波器可以与通常用于多切片扫描仪的矩阵去卷积滤波器组合。 滤波器是通道和DAS增益相关的，并且提供从在多切片扫描中收集的数据生成的图像具有与其他类型的扫描仪产生的图像具有相同的图像质量（例如降噪）。
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公开(公告)号：US08199875B2
公开(公告)日：2012-06-12
申请号：US12760862
申请日：2010-04-15
申请人： Naveen Chandra , Xiaoye Wu , Thomas L. Toth , Jiang Hsieh
发明人： Naveen Chandra , Xiaoye Wu , Thomas L. Toth , Jiang Hsieh
IPC分类号： A61B6/00
CPC分类号： A61B6/4035 , A61B6/032 , A61B6/4007 , A61B6/405 , A61B6/4241 , A61B6/482
摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller configured to apply a first kVp for a first time period, apply a second kVp for a second time period, wherein the second time period is different from the first time period, acquire a first asymmetric view dataset during at least a portion of the first time period, acquire a second asymmetric view dataset during at least a portion of the second time period, and generate an image using the acquired first and second asymmetric view datasets.
摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架，以及被配置为在第一时间段施加第一kVp的控制器，在第二时间段施加第二kVp，其中第二时间段是不同的 从所述第一时间段在所述第一时间段的至少一部分期间获取第一非对称视图数据集，在所述第二时间段的至少一部分期间获取第二非对称视图数据集，并且使用所获取的第一和第二时间段生成图像 非对称视图数据集。
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公开(公告)号：US20120236984A1
公开(公告)日：2012-09-20
申请号：US13484707
申请日：2012-05-31
申请人： Naveen Chandra , Xiaoye Wu , Thomas L. Toth , Jiang Hsieh
发明人： Naveen Chandra , Xiaoye Wu , Thomas L. Toth , Jiang Hsieh
IPC分类号： A61B6/03
CPC分类号： A61B6/4035 , A61B6/032 , A61B6/4007 , A61B6/405 , A61B6/4241 , A61B6/482
摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller. The controller is configured to apply a first kVp for a first time period, apply a second kVp for a second time period, integrate two or more view datasets during the first time period, integrate one or more view datasets during the second time period, and generate an image using the datasets integrated during the first time period and during the second time period.
摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架和控制器。 控制器被配置为在第一时间段内施加第一kVp，在第二时间段施加第二kVp，在第一时间段期间集成两个或更多个视图数据集，在第二时间段期间集成一个或多个视图数据集;以及 使用在第一时间段期间和第二时间段期间集成的数据集生成图像。
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公开(公告)号：US20110142312A1
公开(公告)日：2011-06-16
申请号：US12635901
申请日：2009-12-11
申请人： Thomas L. Toth , Jiang Hsieh , Naveen Chandra , Xiaoye Wu
发明人： Thomas L. Toth , Jiang Hsieh , Naveen Chandra , Xiaoye Wu
CPC分类号： A61B6/405 , A61B6/032 , A61B6/4035 , A61B6/4241 , A61B6/4266 , A61B6/4411 , A61B6/482 , G01T1/2985 , G06T11/005 , G06T2211/408
摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller configured to obtain kVp projection data at a first kVp, obtain kVp projection data at a second kVp, extract data from the kVp projection data obtained at the second kVp, add the extracted data to the kVp projection data obtained at the first kVp to generate mitigated projection data at the first kVp, and generate an image using the mitigated projection data at the first kVp and using the projection data obtained at the second kVp.
摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架，以及控制器，被配置为在第一kVp处获得kVp投影数据，在第二kVp处获得kVp投影数据，从在 第二kVp，将提取的数据加到在第一kVp处获得的kVp投影数据，以在第一kVp处产生减轻的投影数据，并使用第一kVp处的减轻投影数据并使用在第二kVp获得的投影数据生成图像 kVp。
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公开(公告)号：US09135728B2
公开(公告)日：2015-09-15
申请号：US13439245
申请日：2012-04-04
申请人： Jiahua Fan , Jiang Hsieh , Naveen Chandra , Suresh Narayanan Narayanan , Dan Xu
发明人： Jiahua Fan , Jiang Hsieh , Naveen Chandra , Suresh Narayanan Narayanan , Dan Xu
CPC分类号： G06T11/005 , A61B6/032 , A61B6/06 , A61B6/4021 , A61B6/4035 , A61B6/4241 , A61B6/4291 , A61B6/482 , A61B6/582 , G06T2211/408 , G21K1/025 , G21K1/10 , H01J35/26 , H01J35/30
摘要： A CT system includes a gantry, an x-ray source, a detector, and a grating collimator that includes alternating first and second materials. The system includes a controller configured to emit a first beam of x-rays from a first focal spot and to a first detector pixel, wherein the first beam of x-rays passes along a ray and through one of the first materials of the grating collimator, and subsequently emit a second beam of x-rays from a second focal spot and to the first detector pixel, wherein the second beam of x-rays passes substantially along the ray and through one of the second materials of the grating collimator. The system includes a computer programmed to generate first and second kVp image datasets using data acquired from the first beam and second beams of x-rays, and reconstruct a basis material image of the object.
摘要翻译： CT系统包括台架，X射线源，检测器和包括交替的第一和第二材料的光栅准直器。 该系统包括控制器，该控制器被配置为从第一焦点和第一检测器像素发射第一X射线束，其中第一射线束沿着光线并通过光栅准直器的第一材料之一 并且随后从第二焦点和第一检测器像素发射第二射线束，其中所述第二光束X射线基本上沿着所述光线并通过所述光栅准直器的所述第二材料之一通过。 该系统包括被编程为使用从第一光束和第二光束获得的数据来生成第一和第二kVp图像数据集的计算机，并重构对象的基础材料图像。
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17.发明授权公开(公告)号：US08588494B2
公开(公告)日：2013-11-19
申请号：US12915195
申请日：2010-10-29
CPC分类号： H04B1/1638 , G06T11/008 , G06T2211/408
摘要： A system and method for material decomposition optimization in the image domain include a non-transitory computer readable medium has stored thereon a sequence of instructions which, when executed by a computer, causes the computer to access a reconstructed basis material image. For a first voxel of the reconstructed basis material image, the instructions also cause the computer to optimize a concentration of a pair of materials (a,b) in the first voxel exclusively in the image domain and based on a first probability based on random perturbations and a second probability based on random perturbations. The optimization is further based on a third probability based on known materials and a fourth probability based on concentrations of the pair of materials in a pair of voxels neighboring the first voxel.
摘要翻译： 用于图像域中的材料分解优化的系统和方法包括其上存储有一系列指令的非瞬时计算机可读介质，所述指令序列当由计算机执行时使计算机访问重建的基础材料图像。 对于重建的基材图像的第一体素，指令还使计算机优化仅在图像域中的第一体素中的一对材料（a，b）的浓度，并且基于基于随机扰动的第一概率 和基于随机扰动的第二概率。 优化进一步基于基于已知材料的第三概率和基于邻近第一体素的一对体素中的该对材料对的浓度的第四概率。
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公开(公告)号：US20130266115A1
公开(公告)日：2013-10-10
申请号：US13439245
申请日：2012-04-04
申请人： Jiahua Fan , Jiang Hsieh , Naveen Chandra , Suresh Narayanan Narayanan , Dan Xu
发明人： Jiahua Fan , Jiang Hsieh , Naveen Chandra , Suresh Narayanan Narayanan , Dan Xu
CPC分类号： G06T11/005 , A61B6/032 , A61B6/06 , A61B6/4021 , A61B6/4035 , A61B6/4241 , A61B6/4291 , A61B6/482 , A61B6/582 , G06T2211/408 , G21K1/025 , G21K1/10 , H01J35/26 , H01J35/30
摘要： A CT system includes a gantry, an x-ray source, a detector, and a grating collimator that includes alternating first and second materials. The system includes a controller configured to emit a first beam of x-rays from a first focal spot and to a first detector pixel, wherein the first beam of x-rays passes along a ray and through one of the first materials of the grating collimator, and subsequently emit a second beam of x-rays from a second focal spot and to the first detector pixel, wherein the second beam of x-rays passes substantially along the ray and through one of the second materials of the grating collimator. The system includes a computer programmed to generate first and second kVp image datasets using data acquired from the first beam and second beams of x-rays, and reconstruct a basis material image of the object.
摘要翻译： CT系统包括台架，X射线源，检测器和包括交替的第一和第二材料的光栅准直器。 该系统包括控制器，该控制器被配置为从第一焦点和第一检测器像素发射第一X射线束，其中第一射线束沿着光线并通过光栅准直器的第一材料之一 并且随后从第二焦点和第一检测器像素发射第二射线束，其中所述第二光束X射线基本上沿着所述光线并通过所述光栅准直器的所述第二材料之一通过。 该系统包括被编程为使用从第一光束和第二光束获得的数据来生成第一和第二kVp图像数据集的计算机，并重构对象的基础材料图像。
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公开(公告)号：US20130163714A9
公开(公告)日：2013-06-27
申请号：US13545743
申请日：2012-07-10
申请人： Jianying Li , Jiang Hsieh
发明人： Jianying Li , Jiang Hsieh
CPC分类号： G06T11/005 , A61B6/027 , G06T11/003 , G06T2211/421
摘要： A method for reconstructing an image of an object includes scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object. A set of thresholds are determined utilizing the projections, and selected smoothing kernels are associated with the thresholds. The method further includes utilizing the smoothing kernels and the projections to produce smoothed projections in accordance with the thresholds and filtering and backprojecting the smoothed projections to generate an image of the object.
摘要翻译： 用于重建对象的图像的方法包括使用计算机断层摄影（CT）成像设备扫描对象以获取对象的投影。 使用投影来确定一组阈值，并且所选择的平滑内核与阈值相关联。 该方法还包括利用平滑内核和投影来根据阈值产生平滑的投影，并过滤和反投影平滑的投影以生成对象的图像。
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公开(公告)号：US20130156163A1
公开(公告)日：2013-06-20
申请号：US13330128
申请日：2011-12-19
申请人： Xin Liu , Jiang Hsieh
发明人： Xin Liu , Jiang Hsieh
IPC分类号： G01D18/00
CPC分类号： G06T11/005 , A61B6/032 , A61B6/037 , A61B6/4035 , A61B6/4417 , A61B6/482 , A61B6/5211 , A61B6/582 , A61B6/583 , G06T2211/408
摘要： A method for reconstructing an image of an object includes performing an air calibration on an imaging system to generate set of air calibration data, estimating an x-ray spectrum using the air calibration data, and reconstructing an image of an object using the estimated x-ray spectrum. An imaging system and a non-transitory computer readable medium are also described herein.
摘要翻译： 一种用于重建对象的图像的方法包括在成像系统上执行空气校准以产生一组空气校准数据，使用空气校准数据估计X射线谱，以及使用所估计的x轴重建物体的图像， 射线谱。 本文还描述了成像系统和非暂时性计算机可读介质。
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