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31. 发明授权

US07068751B2 System and method of determining a center of mass of an imaging subject for x-ray flux management control 失效
标题翻译：用于确定用于x射线通量管理控制的成像对象的质心的系统和方法
公开(公告)号：US07068751B2
公开(公告)日：2006-06-27
申请号：US10765583
申请日：2004-01-27
申请人： Thomas L. Toth , David M. Hoffman
发明人： Thomas L. Toth , David M. Hoffman
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/4035 , A61B6/4241 , A61B6/4488 , A61B6/469 , A61B6/488 , A61B6/544 , A61B6/583
摘要： A system and method of diagnostic imaging is provided that includes positioning a subject in a scanning bay, comparing a center of mass of the subject to a reference point, and repositioning the subject in the scanning bay to reduce a difference in position between the center of mass of the subject and the reference point. The present invention automatically selects a proper attenuation filter configuration, corrects patient centering, and corrects noise prediction errors, thereby increasing dose efficiency and tube output.
摘要翻译：提供了诊断成像的系统和方法，其包括将被摄体定位在扫描间隔中，将被摄体的质心与参考点进行比较，以及重新定位扫描间隔中的被摄体以减少位于第受试者的质量和参考点。本发明自动选择适当的衰减滤波器配置，校正患者居中，并且校正噪声预测误差，从而提高剂量效率和管输出。

32. 发明授权

US07013034B2 Methods and apparatus for reconstructing an image of an object 失效
标题翻译：用于重建物体的图像的方法和装置
公开(公告)号：US07013034B2
公开(公告)日：2006-03-14
申请号：US10268323
申请日：2002-10-10
申请人： Sharon X. Wang , Thomas L. Toth , Piero U. Simoni , Stephen W. Metz
发明人： Sharon X. Wang , Thomas L. Toth , Piero U. Simoni , Stephen W. Metz
IPC分类号： G06K9/00
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4085 , G06T11/005
摘要： A method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system having a radiation source configured to project a beam of radiation through an object and towards a multislice detector array configured to sense attenuation of the radiation passing through the object; the method includes helically scanning an object to acquire a plurality of slices of projection data, generating a separate projection dataset for each of N separate detector rows wherein the separate projection datasets include detector row projection data and detector row conjugate projection data, combining the detector row projection data and the detector row conjugate projection data, and helically weighting the combined projection data using a combined helical weighting and conjugate data weighting algorithm such that a greater weight is applied to combined center row projection data than to at least one outermost detector row projection data.
摘要翻译：一种用于使用计算机断层摄影（CT）成像系统来重建物体的图像的方法，所述计算机断层摄影（CT）成像系统具有被配置成将辐射束投射穿过物体并朝向被配置为感测穿过物体的辐射的衰减的多层检测器阵列投影的辐射源; 该方法包括螺旋扫描对象以获取多个投影数据片段，为N个单独检测器行中的每一个生成单独的投影数据集，其中分离的投影数据集包括检测器行投影数据和检测器行共轭投影数据，组合检测器行投影数据和检测器行共轭投影数据，并且使用组合的螺旋加权和共轭数据加权算法对组合的投影数据进行螺旋加权，使得对组合的中心行投影数据施加更大的权重，而不是至少一个最外检测器行投影数据。

33. 发明授权

US06993117B2 Method and apparatus of modulating the filtering of radiation during radiographic imaging 有权
公开(公告)号：US06993117B2
公开(公告)日：2006-01-31
申请号：US10935292
申请日：2004-09-07
申请人： Thomas L. Toth , Tsur Bernstein
发明人： Thomas L. Toth , Tsur Bernstein
IPC分类号： G21K3/00
CPC分类号： A61B6/032 , A61B6/4035 , A61B6/4488 , G21K1/10
摘要： The present invention includes a filtering apparatus for a CT imaging system or equivalently for an x-ray imaging system. The filtering apparatus may be translated along a first axis or a transverse axis to with respect to an attenuation pattern of a subject during an imaging session to reduce radiation exposure to anatomical regions of the subject sensitive to radiation exposure and/or regions from which data is not being acquired.

34. 发明授权

US06983180B2 Method of determining and displaying a helical artifact index 失效
标题翻译：确定和显示螺旋伪影指数的方法
公开(公告)号：US06983180B2
公开(公告)日：2006-01-03
申请号：US10065450
申请日：2002-10-18
申请人： Thomas L. Toth , Piero Simoni
发明人： Thomas L. Toth , Piero Simoni
IPC分类号： A61B6/00
CPC分类号： G06K9/033 , A61B6/027 , G06T11/005 , Y10S128/922 , Y10S378/901
摘要： An apparatus and process for determining and displaying a helical artifact index to a system operator are provided. The HAI is determined by acquiring and processing imaging data of a phantom. The HAI is then displayed to the operator on a console so that the operator may, if necessary, reset the scanning parameters or select a new scanning protocol that will result in a reconstructed image of a subject having reduced artifact presence. By providing a likelihood of artifact presence to the system operator, the present invention eliminates the need for the operator to recall those scanning profiles that are susceptible to high artifact presence.
摘要翻译：提供了一种用于确定和显示对系统操作者的螺旋伪影指数的装置和过程。 HAI是通过获取和处理幻影的成像数据来确定的。 HAI然后在控制台上显示给操作员，以便如果需要，操作员可以重置扫描参数或选择一种新的扫描协议，这将导致具有减少的伪像存在的对象的重建图像。通过提供对系统操作者的伪像存在的可能性，本发明消除了操作者需要召回易受高伪影存在的那些扫描轮廓。

35. 发明授权

US06680995B2 Method and apparatus of determining and displaying a helical artifact index 失效
标题翻译：确定和显示螺旋伪影指数的方法和装置
公开(公告)号：US06680995B2
公开(公告)日：2004-01-20
申请号：US09682914
申请日：2001-10-31
申请人： Thomas L. Toth , Piero Simoni
发明人： Thomas L. Toth , Piero Simoni
IPC分类号： G61B600
CPC分类号： G06K9/033 , A61B6/027 , G06T11/005 , Y10S128/922 , Y10S378/901
摘要： An apparatus and process for determining and displaying a helical artifact index to a system operator are provided. The HAI is determined by acquiring and processing imaging data of a phantom. The HAI is then displayed to the operator on a console so that the operator may, if necessary, reset the scanning parameters or select a new scanning protocol that will result in a reconstructed image of a subject having reduced artifact presence. By providing a likelihood of artifact presence to the system operator, the present invention eliminates the need for the operator to recall those scanning profiles that are susceptible to high artifact presence.
摘要翻译：提供了一种用于确定和显示对系统操作者的螺旋伪影指数的装置和过程。 HAI是通过获取和处理幻影的成像数据来确定的。 HAI然后在控制台上显示给操作员，以便如果需要，操作员可以重置扫描参数或选择一种新的扫描协议，这将导致具有减少的伪像存在的对象的重建图像。通过提供对系统操作者的伪像存在的可能性，本发明消除了操作者需要召回易受高伪影存在的那些扫描轮廓。

36. 发明授权

US06327331B1 Method and apparatus for analyzing CT z-axis beam positioning 失效
标题翻译： CT z轴光束定位分析方法及装置
公开(公告)号：US06327331B1
公开(公告)日：2001-12-04
申请号：US09473346
申请日：1999-12-28
申请人： Thomas L. Toth , Steven J. Woloschek
发明人： Thomas L. Toth , Steven J. Woloschek
IPC分类号： G01S2300
CPC分类号： A61B6/587 , A61B6/08 , Y10S378/901
摘要： In one embodiment of the present invention, a method is provided for analyzing performance of tracking control loop in a CT imaging system configured to position an x-ray beam using the tracking control loop. The method includes the steps of collecting control loop data over a plurality of views during scanning and of evaluating control loop data relative to the corresponding views to measure at least one imaging system characteristic. This method provides the imaging system user with data that facilitates insight into possible causes for imaging artifacts. In another embodiment, a CT imaging system is provided including a tracking control loop. The CT imaging system is configured to position an x-ray beam using the tracking control loop, collect control loop data over a plurality of views during scanning and evaluate control loop data relative to the corresponding views to measure at least one imaging system characteristic.
摘要翻译：在本发明的一个实施例中，提供了一种用于分析CT成像系统中的跟踪控制环的性能的方法，该CT成像系统被配置为使用跟踪控制环来定位X射线束。该方法包括以下步骤：在扫描期间在多个视图中收集控制环路数据，并且相对于对应视图评估控制环路数据以测量至少一个成像系统特征。该方法为成像系统用户提供有助于洞察成像伪像的可能原因的数据。在另一个实施例中，提供了包括跟踪控制回路的CT成像系统。 CT成像系统被配置为使用跟踪控制环来定位X射线束，在扫描期间在多个视图上收集控制环路数据，并且相对于对应视图评估控制环路数据以测量至少一个成像系统特性。

37. 发明授权

US06269501B1 Methods and apparatus for automatic patient positioning 有权
标题翻译：自动患者定位的方法和装置
公开(公告)号：US06269501B1
公开(公告)日：2001-08-07
申请号：US09472254
申请日：1999-12-27
申请人： Jianying Li , Thomas L. Toth
发明人： Jianying Li , Thomas L. Toth
IPC分类号： A61B602
CPC分类号： A61B6/08 , A61B6/0457 , A61B6/488
摘要： In one aspect, the present invention is a method for automatically positioning an object, such as a patient, on a movable table using pre-scan scout data. High and low edges and a center of the object are determined as a function of object position in a z-axis direction. At least one threshold is determined from which to determine whether to move the table. The table is automatically repositioned based on comparison of the thresholds to respective distances of the high edge, low edge and center of the object from isocenter. The above described method allows automatic and dynamic adjustment of the table height to a position that prevents over-range while allowing use of higher gains to reduce image noise.
摘要翻译：一方面，本发明是一种用于使用预扫描侦察数据自动地将诸如患者的物体定位在可移动台上的方法。根据物体在z轴方向上的位置确定物体的高低边和中心。确定至少一个阈值以确定是否移动该表。基于阈值与来自等角中心的物体的高边缘，低边缘和中心的距离的比较，自动重新定位桌子。上述方法允许桌面高度的自动和动态调整到防止超范围的位置，同时允许使用更高的增益来减少图像噪声。

38. 发明授权

US6115487A Correction algorithm for bone-induced spectral artifacts in computed tomograph imaging 失效
标题翻译：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
IPC分类号： A61B6/03 , A61B6/00 , G01N23/04 , G06K9/00
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。

39. 发明授权

US6061419A Methods and apparatus for noise compensation in an imaging system 有权
标题翻译：成像系统中噪声补偿的方法和装置
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）。

40. 发明授权

US6052434A X-ray tube target for reduced off-focal radiation 失效
标题翻译：用于减少焦外辐射的X射线管靶
公开(公告)号：US6052434A
公开(公告)日：2000-04-18
申请号：US777369
申请日：1996-12-27
申请人： Thomas L. Toth , Willi H. Hampel , Stephen W. Gravelle , Wayne F. Block
发明人： Thomas L. Toth , Willi H. Hampel , Stephen W. Gravelle , Wayne F. Block
IPC分类号： A61B6/03 , H01J35/10 , H01J35/08
CPC分类号： A61B6/032 , A61B6/4021 , H01J35/10
摘要： An X-ray tube comprises an anode assembly having an associated anode and a cathode assembly for providing a focused electron beam directed to the anode. An anode target, associated with the anode assembly, accelerates the electron beam and produces X-rays upon electron impact with the anode target. Off-focal radiation tends to be most intensely emitted by the top surface of the target. In conventional X-ray tubes, the off-focal radiation as seen by the detector encompasses almost the entire top surface of the target assembly. In accordance with the present invention, the anode target comprises a cut-out top surface for reducing off-focal radiation, by blocking the off-focal radiation from the top surface from reaching the detector. Blocking the radiation produced at the top surface becomes more important as the ratio of the track area visible at the detector decreases with respect to the top surface area.
摘要翻译： X射线管包括具有相关阳极和阴极组件的阳极组件，用于提供指向阳极的聚焦电子束。与阳极组件相关联的阳极靶加速电子束并在与阳极靶电子碰撞时产生X射线。局部放射线趋于由靶的顶面最强烈地发射。在常规的X射线管中，由检测器所看到的非焦距辐射几乎涵盖了目标组件的整个顶表面。根据本发明，阳极靶包括用于通过阻挡来自顶表面的偏焦辐射到达检测器来减少焦点外辐射的切除顶表面。阻挡在顶表面处产生的辐射变得更加重要，因为检测器处可见的轨道区域的比率相对于顶表面积降低。

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