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公开(公告)号：US20100286928A1
公开(公告)日：2010-11-11
申请号：US12772793
申请日：2010-05-03
CPC分类号： G01N23/06 , A61B6/027 , A61B6/032 , G06T11/006 , G06T2211/416 , G06T2211/421
摘要： A method and a device for determining attenuation coefficients for an object using a movable X-ray source and a detector, which is provided for recording projections, is provided. The method includes specifying a trajectory for the movable X-ray source, specifying positions on the trajectory for determining a derivative of projections recorded by the detector, specifying a plurality of scanning positions for each of the specified positions, following the trajectory with the X-ray source and recording a projection for each scanning position, numerically calculating a projection derivative in relation to the trajectory path for each of the positions using the projections recorded for the associated plurality of scanning positions, and determining attenuation coefficients for the object from the calculated projection derivatives using a theoretically exact or approximate rule for the reconstruction.
摘要翻译： 提供了一种用于使用可移动X射线源和检测器确定用于记录投影的物体的衰减系数的方法和装置。 该方法包括指定可移动X射线源的轨迹，指定用于确定由检测器记录的投影的导数的轨迹上的位置，指定针对每个指定位置的多个扫描位置，跟踪具有X轴的轨迹， 并且对每个扫描位置记录投影，使用针对相关联的多个扫描位置记录的投影，针对每个位置对与轨迹路径相关的投影导数进行数值计算，并根据所计算的投影确定该物体的衰减系数 衍生物使用理论上精确或近似的重建规则。
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公开(公告)号：US08619944B2
公开(公告)日：2013-12-31
申请号：US12772793
申请日：2010-05-03
IPC分类号： A61B6/03
CPC分类号： G01N23/06 , A61B6/027 , A61B6/032 , G06T11/006 , G06T2211/416 , G06T2211/421
摘要： A method and a device for determining attenuation coefficients for an object using a movable X-ray source and a detector, which is provided for recording projections, is provided. The method includes specifying a trajectory for the movable X-ray source, specifying positions on the trajectory for determining a derivative of projections recorded by the detector, specifying a plurality of scanning positions for each of the specified positions, following the trajectory with the X-ray source and recording a projection for each scanning position, numerically calculating a projection derivative in relation to the trajectory path for each of the positions using the projections recorded for the associated plurality of scanning positions, and determining attenuation coefficients for the object from the calculated projection derivatives using a theoretically exact or approximate rule for the reconstruction.
摘要翻译： 提供了一种用于使用可移动X射线源和检测器确定用于记录投影的物体的衰减系数的方法和装置。 该方法包括指定可移动X射线源的轨迹，指定用于确定由检测器记录的投影的导数的轨迹上的位置，指定针对每个指定位置的多个扫描位置，跟踪具有X轴的轨迹， 并且对每个扫描位置记录投影，使用针对相关联的多个扫描位置记录的投影，针对每个位置对与轨迹路径相关的投影导数进行数值计算，并根据所计算的投影确定该物体的衰减系数 衍生物使用理论上精确或近似的重建规则。
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3.发明申请METHOD AND DEVICE TO PROVIDE QUALITY INFORMATION FOR AN X-RAY IMAGING PROCEDURE 审中-公开提供X射线成像程序质量信息的方法和设备公开(公告)号：US20120045105A1
公开(公告)日：2012-02-23
申请号：US13210606
申请日：2011-08-16
申请人： Klaus Engel , Oliver Klar , Markus Kowarschik , Manuel Meilinger , Holger Scherl , Christian Schmidgunst
发明人： Klaus Engel , Oliver Klar , Markus Kowarschik , Manuel Meilinger , Holger Scherl , Christian Schmidgunst
IPC分类号： G06K9/00
CPC分类号： G01N23/046 , A61B6/032 , A61B6/4085 , A61B6/4441 , A61B6/5205 , A61B6/5258 , G01N2223/401 , G01N2223/419 , G01N2223/612 , G06T11/008
摘要： In a method and device spatially resolved quality information is provided for an x-ray imaging procedure in which a data field representing the examination subject is reconstructed from a number of exposures of an examination subject. Quality information that indicates the reliability of the reconstructed data field for the corresponding element is determined for a number of elements of the data field.
摘要翻译： 在一种方法和装置中，提供了用于X射线成像程序的空间分辨质量信息，其中从检查对象的多次曝光重建代表检查对象的数据字段。 针对数据字段的多个元素确定指示相应元素的重构数据字段的可靠性的质量信息。
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4.发明申请REDUCTION OF ARTIFACTS CAUSED BY MOVEMENT OF AN X-RAY TUBE IN OBJECT RECONSTRUCTION 审中-公开在对象重建中减少由X射线管移动引起的人造物公开(公告)号：US20100232673A1
公开(公告)日：2010-09-16
申请号：US12706894
申请日：2010-02-17
CPC分类号： A61B6/502 , G06T5/003 , G06T5/50 , G06T2207/10081 , G06T2207/30068
摘要： An improvement in image quality when determining an image using iterative reconstruction is provided by taking account of focus shifts. In order to take into consideration the influence of focus shift in calculated projections, several different projections are calculated for each section of the focus path on a section-by-section basis. The several different calculated projections for a section are averaged for comparison with a projection recorded in the section. Improved image quality is provided, for example, in tomosynthesis applications in which a large number of recordings are made with a stationary detector.
摘要翻译： 通过考虑焦点偏移来提供使用迭代重建确定图像时图像质量的改善。 为了考虑到计算投影中的焦点偏移的影响，对于每个焦点路径的每一个部分，逐个部分地计算出几个不同的投影。 对于部分的几个不同的计算投影进行平均，以与该部分中记录的投影进行比较。 提供了改进的图像质量，例如在其中使用固定式检测器进行大量记录的断层合成应用中。
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公开(公告)号：US20120201352A1
公开(公告)日：2012-08-09
申请号：US13363668
申请日：2012-02-01
IPC分类号： G01N23/04
CPC分类号： G01N23/046 , A61B6/027 , A61B6/032 , A61B6/035 , A61B6/4441 , A61B6/4452 , A61B6/4458 , A61B6/583 , A61B6/584 , G01N2223/3303 , G01N2223/419 , G06T11/005
摘要： A method for obtaining a 3D image dataset of an object of interest is proposed. A plurality of 2D X-ray images are captured and a 3D reconstruction is carried out using filtered back projection. The projection parameters have been measured with the aid of a calibrating phantom, possibly using an interpolation or extrapolation of such measurements. A model of effect strings of the components in an X-ray imaging device is obtained, and the model parameters are identified based on imaging of a calibrating phantom. A projection matrix can then be calculated for any positions on any desired trajectories, without having to use imaging of a calibrating phantom at precisely that position and desired trajectory.
摘要翻译： 提出了一种用于获取感兴趣对象的3D图像数据集的方法。 捕获多个2D X射线图像，并且使用滤波反投影来执行3D重建。 已经借助于校准体模测量了投影参数，可能使用这种测量的内插或外推法。 获得X射线成像装置中的部件的效应串的模型，并且基于校准体模的成像来识别模型参数。 然后可以对任何所需轨迹上的任何位置计算投影矩阵，而无需在精确的位置和期望的轨迹上使用校准模型的成像。
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公开(公告)号：US08942345B2
公开(公告)日：2015-01-27
申请号：US13363668
申请日：2012-02-01
CPC分类号： G01N23/046 , A61B6/027 , A61B6/032 , A61B6/035 , A61B6/4441 , A61B6/4452 , A61B6/4458 , A61B6/583 , A61B6/584 , G01N2223/3303 , G01N2223/419 , G06T11/005
摘要： A method for obtaining a 3D image dataset of an object of interest is proposed. A plurality of 2D X-ray images are captured and a 3D reconstruction is carried out using filtered back projection. The projection parameters have been measured with the aid of a calibrating phantom, possibly using an interpolation or extrapolation of such measurements. A model of effect strings of the components in an X-ray imaging device is obtained, and the model parameters are identified based on imaging of a calibrating phantom. A projection matrix can then be calculated for any positions on any desired trajectories, without having to use imaging of a calibrating phantom at precisely that position and desired trajectory.
摘要翻译： 提出了一种用于获取感兴趣对象的3D图像数据集的方法。 捕获多个2D X射线图像，并且使用滤波反投影来执行3D重建。 已经借助于校准体模测量了投影参数，可能使用这种测量的内插或外推法。 获得X射线成像装置中的部件的效应串的模型，并且基于校准体模的成像来识别模型参数。 然后可以对任何所需轨迹上的任何位置计算投影矩阵，而无需在精确的位置和期望的轨迹上使用校准模型的成像。
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公开(公告)号：US10524755B2
公开(公告)日：2020-01-07
申请号：US15866962
申请日：2018-01-10
摘要： Vessel overlap artifacts are reduced in a four-dimensional angiography data set a blood vessel system of a patient with a contrast medium. A three-dimensional vessel data set of the blood vessel system is reconstructed from two-dimensional projection images of digital subtraction angiography showing the blood vessel system, determined by multiplicative back projection of the projection images into the vessel data set or a base data set of the four-dimensional angiography data set derived vessel data set. A plausibility check is performed with vessel sections displayed as filled with contrast medium in partial image data sets of the angiography data set assigned to all individual, and different instants of the covered period are checked against a plausibility check criterion checking for a contrast medium-filled connection to an admissible source point, after which a corrected partial image data set is determined containing only vessel sections satisfying the plausibility check criterion.
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8.发明授权公开(公告)号：US10217215B2
公开(公告)日：2019-02-26
申请号：US15367866
申请日：2016-12-02
摘要： A method for adapting the brightness of an X-ray image is provided. The X-ray image is recorded using a filter attenuating X-ray radiation used for recording the X-ray image differently in at least two spatial filter regions. The method includes determining image regions mapping the filter regions from filter parameters and recording geometry parameters describing the filter regions from at least one evaluation line running perpendicular to a boundary between image regions. The method also includes determining, for each evaluation line, a correction value describing a difference in brightness between the image regions from an image value profile along the evaluation line in an evaluation area containing the boundary, determining at least one correction factor from the at least one correction value, and adapting the brightness between the at least two image regions by scaling the image values with the correction factor.
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公开(公告)号：US20180218521A1
公开(公告)日：2018-08-02
申请号：US15874998
申请日：2018-01-19
CPC分类号： G06T11/206 , A61B6/465 , A61B6/481 , A61B6/504 , G06T11/008 , G06T2200/24 , G06T2210/41 , G06T2211/404
摘要： A method is provided for image processing an angiography data set of a capture region of interest of a patient's vascular system. The method includes establishing a static time parameter set from the angiography data set, wherein the static time parameter set includes time parameters and characterizes the time profile of the contrast agent concentration for picture elements of the capture region described in the image data subsets; establishing a series of mask data sets by picture element-by-picture element application of a window function having a window width of greater than zero; selecting a subinterval in the parameter space covered by the time parameters for each instant of the series to the static time parameter set; and establishing a series of static display data sets by applying the mask data sets to a static vessel data set, which shows a vascular system perfused by the contrast agent in the capture region and which underlies or is derived from the angiography data set.
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公开(公告)号：US08929632B2
公开(公告)日：2015-01-06
申请号：US13621889
申请日：2012-09-18
申请人： Tim Horz , Markus Kowarschik
发明人： Tim Horz , Markus Kowarschik
CPC分类号： A61B6/481 , A61B6/504 , A61B6/5211 , G06T11/001
摘要： A method of visualizing changes in blood flow in a digital subtraction angiography (DSA) image sequence is disclosed. A time-contrast curve is generated for all pixels in each image of the DSA image sequence. A reference parameter for each time-contrast curve to be used as a first time point is specified. The value of the reference parameter for each time-contrast curve is determined and an arbitrary parameter is specified for each time-contrast curve to be used as a second time point. An output image is generated by applying a color-coding of the difference between the first time point and the second time point to all pixels.
摘要翻译： 公开了一种在数字减影血管造影（DSA）图像序列中可视化血流变化的方法。 为DSA图像序列的每个图像中的所有像素生成时间 - 对比度曲线。 指定要用作第一时间点的每个时间 - 对比度曲线的参考参数。 确定每个时间 - 对比度曲线的参考参数的值，并且为每个时间 - 对比度曲线指定任意参数作为第二时间点。 通过将第一时间点和第二时间点之间的差的颜色编码应用于所有像素来生成输出图像。
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