-
101.发明授权公开(公告)号：US07970195B2
公开(公告)日：2011-06-28
申请号：US11908294
申请日：2006-03-07
申请人： Andy Ziegler , Thomas Koehler , Roland Proksa
发明人： Andy Ziegler , Thomas Koehler , Roland Proksa
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , G06T2211/424
摘要： The invention relates to a device and a method for the iterative reconstruction of the attenuation coefficients μj in a tomographic image of an object (1) from projection measurements mi. In the update equation for μjn during the n-th iteration the backprojected error (mi−mi−(μjn)) is weighted by a voxel dependent factor Formula (I). Such a voxel dependent update may particularly be included in the algorithms of ART or ML.
摘要翻译： 本发明涉及一种用于从投影测量mi在物体（1）的断层图像中迭代重建衰减系数μj的装置和方法。 在第n次迭代期间的μjn的更新方程中，反投影误差（mi-mi-（μjn））由体素因子因子公式（I）加权。 这种体素相关更新可以特别地包括在ART或ML的算法中。
-
公开(公告)号：US07668289B2
公开(公告)日：2010-02-23
申请号：US11912689
申请日：2006-04-25
申请人： Roland Proksa , Michael Grass
发明人： Roland Proksa , Michael Grass
IPC分类号： A61B6/03
CPC分类号： G01T1/2985 , G01N23/046 , G01N2223/419 , G01V5/0041 , G01V5/005
摘要： Spectral CT systems require cheap detectors with high energy resolution. According to an aspect of the present invention, a computer tomography apparatus comprises a detector element which is segmented into a plurality of sub-pixels. Each sub-pixel has at least two thresholds and counting channels, wherein the second threshold for each sub-pixel varies over the nominal detector element. This may provide for an improved energy-resolved photon counting.
摘要翻译： 光谱CT系统需要具有高能量分辨率的廉价检测器。 根据本发明的一个方面，计算机断层摄影装置包括被分割成多个子像素的检测器元件。 每个子像素具有至少两个阈值和计数通道，其中每个子像素的第二阈值在标称检测器元件上变化。 这可以提供改进的能量分辨光子计数。
-
公开(公告)号：US20090310736A1
公开(公告)日：2009-12-17
申请号：US12373112
申请日：2007-07-02
申请人： Andy Ziegler , Roland Proksa
发明人： Andy Ziegler , Roland Proksa
CPC分类号： G01T1/2985
摘要： A computed tomography system includes an x-ray source (108) that rotates about and emits radiation through an imaging region (116). At least one finite energy resolution detector (112) detects the emitted radiation. The at least one finite resolution detector (112) includes a plurality of sub-detectors (204). Each of the plurality of sub-detectors (204) is associated with one or more different energy thresholds. Each of the energy thresholds is used to count a number of incident photons based on a corresponding energy level. A reconstruction system (136) reconstructs the photon counts to generate one or more images of a subject residing within the imaging region (116).
摘要翻译： 计算机断层摄影系统包括绕着成像区域（116）旋转并发射辐射的x射线源（108）。 至少一个有限能量分辨率检测器（112）检测发射的辐射。 所述至少一个有限分辨率检测器（112）包括多个子检测器（204）。 多个子检测器（204）中的每一个与一个或多个不同的能量阈值相关联。 每个能量阈值用于根据相应的能级对一些入射光子进行计数。 重建系统（136）重建光子计数以产生驻留在成像区域（116）内的对象的一个或多个图像。
-
104.发明申请公开(公告)号：US20090232372A1
公开(公告)日：2009-09-17
申请号：US11817032
申请日：2006-02-13
申请人： Thomas Köhler , Roland Proksa
发明人： Thomas Köhler , Roland Proksa
IPC分类号： G06K9/00
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4085 , A61B6/503
摘要： A device (118) for analyzing multi-cycle cardiac computer tomography data detected by attenuating X-rays by a heart (130), comprising a first determining unit adapted to determine, based on the detected computer tomography data, a cardiac weighting function (302) for a reconstruction of an image of the heart (130), and a modifying unit adapted to modify the cardiac weighting function (302) in such a manner that an overlap of succeeding distribution functions (303) of the weighting function (302), which distribution functions (303) are assigned to different cycles of the heart (130), is at least equal to a predefined overlap threshold.
摘要翻译： 一种用于分析通过由心脏衰减X射线检测的多周期心脏计算机断层摄影数据的装置（118），包括：第一确定单元，适于基于检测到的计算机断层摄影数据确定心脏加权函数（302） ），用于重建心脏图像（130）;以及修改单元，其适于以下述方式修改心脏加权函数（302），使得加权函数（302）的后续分布函数（303）的重叠， 分配功能（303）被分配给心脏（130）的不同周期至少等于预定义的重叠阈值。
-
公开(公告)号：US20090185655A1
公开(公告)日：2009-07-23
申请号：US11575662
申请日：2005-09-23
申请人： Peter Koken , Andy Ziegler , Michael Grass , Thomas Köhler , Roland Proksa
发明人： Peter Koken , Andy Ziegler , Michael Grass , Thomas Köhler , Roland Proksa
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4028 , A61B6/4085 , A61B6/4291
摘要： A computed tomography method and apparatus are provided wherein a radiation source moves circularly relative to an examination zone about an axis of rotation (14). The radiation source produces a cone beam of x-rays and the focal point of this cone beam is switched between at least two positions (23a, 23b) spaced apart from each other and arranged on a line parallel to the axis of rotation to enlarge the reconstructable examination zone parallel to the axis of rotation. Preferably, the image of the examination zone is reconstructed using an iterative reconstruction method, in particular an algebraic reconstruction method or a maximum likelihood method.
摘要翻译： 提供了一种计算机断层摄影方法和装置，其中辐射源围绕旋转轴线（14）相对于检查区域循环移动。 辐射源产生X射线的锥形束，并且该锥形束的焦点在至少两个彼此间隔开的位置（23a，23b）之间切换并且布置在与旋转轴线平行的线上，以扩大 可重建检查区域平行于旋转轴。 优选地，使用迭代重建方法，特别是代数重建方法或最大似然方法来重建检查区域的图像。
-
公开(公告)号：US07545903B2
公开(公告)日：2009-06-09
申请号：US10564572
申请日：2004-07-07
IPC分类号： A61B6/03
CPC分类号： G06T7/20 , G06T11/005 , G06T2207/10081 , G06T2207/30048 , G06T2211/404 , G06T2211/412
摘要： In the CT imaging of non-homogeneously moving objects such as the heart or the coronary vessel tree, there is a problem that different parts of the objects are at rest at different points in time. Thus, a gated reconstruction with a globally selected time point does not yield a sharp image of such objects. According to the present invention, a motion of the objects is estimated, describing the motion of selected regions of these objects. Then, on the basis of the estimated motion, time points are determined, where these areas have minimal motion. Then, an image is reconstructed, wherein the data from which the respective regions are reconstructed, correspond to the respective time points, where the regions have minimal motion. Due to this, an improved image qualify maybe provided.
摘要翻译： 在诸如心脏或冠状血管树之类的非均匀运动物体的CT成像中，存在不同部分的物体在不同时间点处于静止状态的问题。 因此，具有全局选择的时间点的门控重构不会产生这样的对象的清晰图像。 根据本发明，估计对象的运动，描述这些对象的选定区域的运动。 然后，在估计运动的基础上，确定这些区域具有最小运动的时间点。 然后，重建图像，其中各个区域被重构的数据对应于各个时间点，其中区域具有最小的运动。 因此，可以提供改进的图像资格。
-
107.发明授权公开(公告)号：US07394927B2
公开(公告)日：2008-07-01
申请号：US10555576
申请日：2004-04-26
申请人： Roland Proksa , Thomas Köhler
发明人： Roland Proksa , Thomas Köhler
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , G06T2211/424
摘要： An iterative method determines a spatial distribution of values of a property of an object, and particularly values of its absorption, in an examination region, on the basis of measured values that values are acquired with a measuring device, and particularly with a computer tomograph. The reliability of each measured value is taken into account when this is done. The measured values can each be represented as a sum of values of the property that have each been multiplied by a proportional factor, the proportional factor being a measure of the proportion that a value of the property forms of the measured value. Each value of the property is approached by one iteration value at a time by setting each iteration value to a starting value and, in an iteration step, generating for each measured value a reference measured value, forming the difference between each reference measured value and the corresponding measured value, and multiplying this difference by a reliability parameter and projecting it backward into the examination region.
摘要翻译： 迭代方法基于使用测量装置获得的值的测量值，特别是与计算机断层摄影机相比较，确定对象的属性的值的空间分布，特别是其在检查区域中的吸收值。 当完成时，会考虑每个测量值的可靠性。 测量值可以各自表示为每个乘以比例因子的性质的值的和，比例因子是测量值的属性形式的值的比例的度量。 通过将每个迭代值设置为起始值，将属性的每个值接近一个迭代值，并且在迭代步骤中，为每个测量值生成参考测量值，从而形成每个参考测量值与 相应的测量值，并将该差乘以可靠性参数并将其向后投影到检查区域。
-
公开(公告)号：US20070053482A1
公开(公告)日：2007-03-08
申请号：US10564572
申请日：2004-07-07
申请人： Thomas Kohler , Michael Grass , Michael Kuhn , Roland Proksa
发明人： Thomas Kohler , Michael Grass , Michael Kuhn , Roland Proksa
CPC分类号： G06T7/20 , G06T11/005 , G06T2207/10081 , G06T2207/30048 , G06T2211/404 , G06T2211/412
摘要： In the CT imaging of non-homogeneously moving objects such as the heart or the coronary vessel tree, there is a problem that different parts of the objects are at rest at different points in time. Thus, a gated reconstruction with a globally selected time point does not yield a sharp image of such objects. According to the present invention, a motion of the objects is estimated, describing the motion of selected regions of these objects. Then, on the basis of the estimated motion, time points are determined, where these areas have minimal motion. Then, an image is reconstructed, wherein the data from which the respective regions are reconstructed, correspond to the respective time points, where the regions have minimal motion. Due to this, an improved image qualify maybe provided.
摘要翻译： 在诸如心脏或冠状血管树之类的非均匀运动物体的CT成像中，存在不同部分的物体在不同时间点处于静止状态的问题。 因此，具有全局选择的时间点的门控重构不会产生这样的对象的清晰图像。 根据本发明，估计对象的运动，描述这些对象的选定区域的运动。 然后，在估计运动的基础上，确定这些区域具有最小运动的时间点。 然后，重建图像，其中各个区域被重构的数据对应于各个时间点，其中区域具有最小的运动。 因此，可以提供改进的图像资格。
-
公开(公告)号：US06561695B2
公开(公告)日：2003-05-13
申请号：US10144829
申请日：2001-10-25
申请人： Roland Proksa
发明人： Roland Proksa
IPC分类号： A61B600
CPC分类号： A61B6/583 , A61B6/027 , A61B6/032 , A61B6/0442 , A61B6/4085 , A61B6/5276 , A61B6/547
摘要： The reconstruction in Cone-beam CT scanner requires a high accuracy of the tabletop (1) position determination. In sequential as well as in helical acquisitions projection data (20) from different tabletop (1) positions are combined. Additional position markers, manufactured as insertions (10) of a contrast material relative to the material of the tabletop (1), are introduced into the tabletop (1). These insertions (10) allow the determination of the true position of the tabletop (1) from projection data. This information can be used to either control the scanner mechanics or as a correction information for the reconstruction process.
-
公开(公告)号：US4873486A
公开(公告)日：1989-10-10
申请号：US241635
申请日：1988-09-08
CPC分类号： G01R33/3621 , G01R33/3607
摘要： A magnetic resonance spectrometer in which, at least in the receiving branch, the received spin resonance signal is transposed by successive mixing processes into a transposed signal having a higher frequency range than the baseband. The transposed signal is converted into a digital signal by an analog-to-digital converter.
摘要翻译： 一种磁共振光谱仪，其中至少在接收分支中，接收的自旋共振信号通过连续的混合处理转置成具有比基带更高的频率范围的转置信号。 转置信号由模数转换器转换为数字信号。
-
-
-
-
-
-
-
-
-
搜索结果
142 条记录 (耗时 0.03 秒)
