公开(公告)号：US06819736B1

公开(公告)日：2004-11-16

申请号：US10371702

申请日：2003-02-20

申请人： Herbert Bruder ,  Bernd Ohnesorge ,  Karl Stierstorfer ,  Thomas Flohr ,  Stefan Schaller

发明人： Herbert Bruder ,  Bernd Ohnesorge ,  Karl Stierstorfer ,  Thomas Flohr ,  Stefan Schaller

IPC分类号： A61B603

CPC分类号： A61B6/4028 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4233 ,  A61B6/503 ,  G06T11/006 ,  G06T2211/412 ,  Y10S378/901

摘要： The invention relates to a method for performing computer tomography, and to a computed tomography (CT) apparatus, in which a) for scanning an object by a cone-shaped beam exiting from a focal point and by a matrix-like detector array for detecting the beam, the focal point is moved in relation to the object on a spiral path, whose center axis corresponds to a system axis, and the detector array provides output data corresponding to the received radiation; and b) for imaging an object region that executes a periodic motion, a signal that reproduces the course over time of the periodic motion is obtained during the scanning; c) from output data furnished during the motion of the focal point on a spiral segment, images with an inclined image plane are reconstructed, the image planes being inclined relative to the system axis both about a first axis, which perpendicularly intersects the system axis, by an angle of inclination &ggr; and about a second axis, which perpendicularly intersects both the first axis and the system axis, by a tilt angle &dgr;; and spiral segments that immediately succeed one another overlap one another by an overlap angle that is greater than or equal to zero; and the spiral segments are selected, taking into account the signal that reproduces the course over time of the periodic motion, such that they correspond to a phase of the periodic motion that is to be imaged.

摘要翻译： 本发明涉及一种用于执行计算机断层摄影的方法，以及计算机断层摄影（CT）装置，其中a）通过从焦点出射的锥形束和用于检测的矩阵状检测器阵列扫描物体 光束，焦点相对于螺旋路径上的物体移动，螺旋路径的中心轴对应于系统轴，并且检测器阵列提供对应于接收到的辐射的输出数据; 以及b）为了对执行周期性运动的对象区域进行成像，在扫描期间获得在周期性运动中再现该过程的信号; c）从在焦点的运动中在螺旋段上提供的输出数据中重建具有倾斜图像平面的图像，图像平面相对于垂直于系统轴线的第一轴线相对于系统轴线倾斜， 通过与第一轴和系统轴两者垂直相交的倾斜角γ和大约第二轴的倾斜角δ; 并且立即成功的螺旋段彼此重叠大于或等于零的重叠角; 并且考虑到再现周期性运动的时间过程的信号，使得它们对应于要成像的周期性运动的相位，并选择螺旋段。

公开(公告)号：US06819735B2

公开(公告)日：2004-11-16

申请号：US10606798

申请日：2003-06-27

申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

IPC分类号： A61B603

CPC分类号： G06T5/007 ,  G06T11/008 ,  G06T2207/10081 ,  Y10S378/901

摘要： A method is for organ-specific image optimization in computed tomography. In this case, the HU values of a layer of the body previously recorded with a CT device are calculated and, on this basis, a first CT image is created. For this first CT image, a histogram is also created, in which the frequency distribution of the HU values is reproduced. In a histogram, at least one organ-specific HU region is defined and the latter is allocated an HU-dependent transfer function. Furthermore, a second CT image is created on the basis of the previously calculated HU values for the layer of the body which has been recorded. The first and second CT image are filtered with the HU-dependent transfer function and, finally, the filtered first CT image is mixed with the filtered second CT image.

公开(公告)号：US06819734B2

公开(公告)日：2004-11-16

申请号：US10290520

申请日：2002-11-08

申请人： Rainer Raupach

发明人： Rainer Raupach

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  G06T5/002 ,  G06T5/10 ,  G06T5/20 ,  G06T2207/10081 ,  G06T2207/20032 ,  G06T2207/20192 ,  G06T2207/30004 ,  Y10S378/901

摘要： An algorithmic method is used for suppressing artifacts in computed tomography raw data, on the basis of the determination and subsequent subtraction of a correction sinogram from a measured starting sinogram. The method includes high-pass filtering of a starting sinogram in the channel direction, and low-pass filtering in the projection direction in order to improve the signal-to-noise ratio. Thereafter, the magnitude of a weighted gradient of each data point in the low-pass-filtered sinogram is formed, both in the projection direction and symmetrically about the corresponding channel axis. The data point is eliminated if the change amplitude thereof exceeds a first defined threshold value. Residual data points are removed in the low-pass-filtered sinogram if their amplitude exceeds a second defined threshold value, and low-pass filtering of the resulting sinogram occurs in the form of averaging in the projection direction. The correction sinogram thus obtained is finally subtracted from the starting sinogram.

摘要翻译： 基于来自测量的起始正弦图的确定和随后的校正窦位图的减法，使用算法方法来抑制计算机断层摄影原始数据中的假象。 该方法包括对信道方向上的起始正弦图进行高通滤波，并且在投影方向上进行低通滤波，以提高信噪比。 此后，在投影方向和对应的通道轴上对称地形成低通滤波正弦图中的每个数据点的加权梯度的大小。 如果数据点的变化幅度超过第一定义的阈值，则消除数据点。 如果低通滤波正弦图幅度超过第二定义阈值，则残留数据点被去除，并且以投影方向平均的形式对所得到的正弦图进行低通滤波。 这样得到的校正正弦图最终从起始正弦图中减去。

公开(公告)号：US06788758B2

公开(公告)日：2004-09-07

申请号：US10466496

申请日：2003-07-16

申请人： Mattieu Stefan De Villiers

发明人： Mattieu Stefan De Villiers

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  G06T2211/424 ,  G06T2211/436 ,  Y10S378/901

摘要： A method of reconstructing a tomographic image of an object from incomplete projection data using a limited angle tomography technique. The method includes using the protection data to obtain a first reconstruction of the image. Thereafter, regions in the first reconstruction that can be predicted with an acceptable degree of certainty in a final reconstruction, are identified. Prior knowledge in the form of possible density levels and piece-wise smoothness that regions in an image can assume, are applied to those regions of acceptable certainty in the first reconstruction so as to obtain a second reconstruction. The projection data is then applied to projections of the second reconstruction using a constraining method to obtain a third reconstruction. In the same way regions of acceptable certainty are identified and the prior knowledge and the projection data are applied to the third reconstruction and subsequent reconstructions until a final reconstruction is achieved.

摘要翻译： 一种使用有限角度层析成像技术从不完全投影数据重建物体的断层图像的方法。 该方法包括使用保护数据来获得图像的第一重建。 此后，确定在最终重建中可以以可接受的确定性预测的第一次重建中的区域。 以图像中的区域可以承担的可能密度级别和分段平滑度的形式的先验知识被应用于在第一重建中可接受的确定性的那些区域，以便获得第二重构。 然后使用约束方法将投影数据应用于第二重建的投影以获得第三重建。 以相同的方式识别可接受的确定性的区域，并且将先前的知识和投影数据应用于第三次重建和随后的重建，直到实现最终重建。

公开(公告)号：US06778628B2

公开(公告)日：2004-08-17

申请号：US10401680

申请日：2003-03-31

申请人： Masahiko Yamazaki ,  Miwa Okumura ,  Shinsuke Tsukagoshi

发明人： Masahiko Yamazaki ,  Miwa Okumura ,  Shinsuke Tsukagoshi

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/4014 ,  A61B6/4085 ,  A61B6/4266 ,  A61B6/463 ,  A61B6/467 ,  A61B6/542 ,  A61B6/583 ,  Y10S378/901

摘要： An X-ray computed tomography apparatus is provided to reconstruct image data based on projection data acquired by scanning a subject with an X-ray. A calculator is configured to calculate a dose efficiency index based on an expected dose of an X-ray radiated from an input device. The dose efficiency index indicates a diameter of a target which is identified at a predetermined detectability rate and has a predetermined CT value difference with respect to a surrounding CT value. A plan support system is configured to build up a scan planning screen on which the input expected dose is contained along with the calculated dose efficiency index. The scan planning screen is displayed on a display.

摘要翻译： 提供X射线计算机断层摄影装置，用于基于通过用X射线扫描对象获取的投影数据来重建图像数据。 计算器被配置为基于从输入设备辐射的X射线的预期剂量来计算剂量效率指数。 剂量效率指数表示以预定的检测率被识别并且相对于周围CT值具有预定的CT值差的目标的直径。 计划支持系统被配置为建立扫描计划屏幕，其中包含输入预期剂量以及计算的剂量效率指数。 扫描计划画面显示在显示屏上。

公开(公告)号：US06754299B2

公开(公告)日：2004-06-22

申请号：US10211206

申请日：2002-08-02

申请人： Sarah K. Patch

发明人： Sarah K. Patch

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4085 ,  G06T11/005 ,  Y10S378/901

摘要： A method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system is provided. The CT system includes a radiation source and a multislice detector array on a rotating gantry, with the radiation source configured to project a beam of radiation through an object and towards. the multislice detector array. The multislice detector array is configured to sense attenuation of the radiation passing through the object. The method for reconstructing an image includes helically scanning an object with a computed tomographic imaging system to acquire a plurality of views of projection data at a plurality of gantry angles and a plurality of cone angles, generating a plurality of cone angle dependent weights that are inversely correlated to an absolute value of a cone angle, and weighting the projection data using the cone angle dependent weights.

摘要翻译： 提供了一种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。 CT系统包括辐射源和位于旋转机架上的多层检测器阵列，其中辐射源被配置成将辐射束投射通过物体并朝向。 多重检测器阵列。 多层检测器阵列被配置为感测穿过物体的辐射的衰减。 用于重建图像的方法包括用计算机断层摄影系统螺旋扫描对象，以获取多个台架角度和多个锥角度的投影数据的多个视图，产生多个相反的锥角依赖权重 与锥角的绝对值相关，并且使用锥角依赖权重对投影数据进行加权。

公开(公告)号：US06754297B2

公开(公告)日：2004-06-22

申请号：US10229889

申请日：2002-08-28

申请人： Dean Norman James

发明人： Dean Norman James

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/4014 ,  A61B6/4266 ,  A61B6/4405 ,  A61B6/504 ,  Y10S378/901

摘要： A computing device in a three-dimensional imaging system utilizes a plurality of distance readings and reference readings from the at least one subject sensor to determine a subject location and a subject volume and establish a base-three dimensional map of a subject. A plurality of two-dimensional image exposures along with a plurality of associated reference locations are created by rotating an image source and an image receptor around an inner circumference of an imaging gantry. The plurality of two-dimensional image exposures is digitized to create a plurality of digital two-dimensional image exposures. The computing device receives the plurality of digital two-dimensional image exposures and the plurality of associated reference locations. The overlaying, interpolating, and pasting of the plurality of digital two-dimensional image exposures on the base three-dimensional map creates a base three-dimensional image exposure, which is displayed on a display device.

摘要翻译： 三维成像系统中的计算设备利用来自至少一个对象传感器的多个距离读数和参考读数来确定对象位置和对象体积并建立对象的基础三维图。 通过围绕成像台架的内周旋转图像源和图像接收器来产生多个二维图像曝光以及多个相关联的参考位置。 将多个二维图像曝光数字化以产生多个数字二维图像曝光。 计算设备接收多个数字二维图像曝光和多个相关联的参考位置。 在基础三维地图上的多个数字二维图像曝光的叠加，内插和粘贴创建了显示在显示装置上的基础三维图像曝光。

公开(公告)号：US06751283B2

公开(公告)日：2004-06-15

申请号：US10213467

申请日：2002-08-06

申请人： Peter G. van de Haar

发明人： Peter G. van de Haar

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4447 ,  Y10S378/901

摘要： A computed tomography apparatus (10) for performing volumetric helical imaging acquires helical computed tomography imaging data (72) using a tilted gantry geometry. In the tilted gantry geometry, a rotational plane of a rotating radiation source (16) is tilted at an angle (&khgr;) with respect to a direction (Z) of linear motion of a subject. A transform processor (40) transforms (74) the imaging data (72) to a zero tilt geometry. A rebinning processor (50) rebins (110) the transformed imaging data (76) to a non-sheared detector window. A reconstruction processor (54) reconstructs (130) the transformed and rebinned imaging data (112) to generate a three-dimensional image representation (132). Optionally, an image transform processor (56) transforms (134) the reconstructed image representation (132) with an inverse of the zero tilt geometry transformation (74).

摘要翻译： 用于执行体积螺旋成像的计算机断层摄影装置（10）使用倾斜台架几何获取螺旋计算机断层成像数据（72）。 在倾斜台架几何形状中，旋转辐射源（16）的旋转平面相对于被摄体的线性运动的方向（Z）以角度（chi）倾斜。 变换处理器（40）将（74）成像数据（74）变换为零倾斜几何形状。 重组处理器（50）将转换的成像数据（76）重新（110）到非剪切检测器窗口。 重建处理器（54）重建（130）经变换和重新组合的成像数据（112）以生成三维图像表示（132）。 可选地，图像变换处理器（56）利用零倾斜几何变换（74）的倒数变换（134）重建图像表示（132）。

公开(公告)号：US06748044B2

公开(公告)日：2004-06-08

申请号：US10243056

申请日：2002-09-13

申请人： John M. Sabol ,  Gopal B. Avinash ,  Matthew J. Walker

发明人： John M. Sabol ,  Gopal B. Avinash ,  Matthew J. Walker

IPC分类号： A61B603

CPC分类号： G06T7/0012 ,  Y10S378/901

摘要： The present technique provides a method and system for generating tomographic mammography data and processing the data using a computer aided detection and diagnosis (CAD) algorithm. The CAD algorithm may perform various types of analysis, including segmentation, feature extraction, and feature classification. The acquired data may be processed in parallel by the CAD algorithm such that information derived from one processing path may be used to enhance or alter the processing of data in a parallel processing path. The processed data may be used to provide an enhanced mammographic image with features of interest marked for inspection by a radiologist. The features of interest may also be classified to aid the inspection by the radiologist.

摘要翻译： 本技术提供了一种使用计算机辅助检测和诊断（CAD）算法生成断层摄影乳腺X线摄影数据和处理数据的方法和系统。 CAD算法可以执行各种类型的分析，包括分割，特征提取和特征分类。 可以通过CAD算法并行处理所获取的数据，使得从一个处理路径导出的信息可以用于增强或改变并行处理路径中的数据的处理。 经处理的数据可以用于提供具有兴趣的特征的增强的乳房X光照相图像标记为由放射科医师进行检查。 感兴趣的特征也可以分类以帮助放射科医师的检查。

公开(公告)号：US06731716B2

公开(公告)日：2004-05-04

申请号：US10277051

申请日：2002-10-22

申请人： Kazumasa Mihara ,  Keiichi Hori ,  Yuichiro Kaminou ,  Setuta Setogawa

发明人： Kazumasa Mihara ,  Keiichi Hori ,  Yuichiro Kaminou ,  Setuta Setogawa

IPC分类号： A61B603

CPC分类号： A61B6/4275 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/4085 ,  A61B6/4488

摘要： An X-ray CT apparatus comprises a large number of X-ray sources, a detector, and a collimator. The X-ray sources are arranged around an object P of inspection. The detector detects X rays emitted from the X-ray sources. The collimator is located between the X-ray sources and the object of inspection, and restricts the angle of emission of the X rays emitted from the X-ray sources so as to match the size of the detection surface of the detector.

摘要翻译： X射线CT装置包括大量X射线源，检测器和准直器。 X射线源围绕检查对象P排列。 检测器检测从X射线源发射的X射线。 准直器位于X射线源和检查对象之间，并且限制从X射线源发射的X射线的发射角度，以便与检测器的检测表面的大小相匹配。