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    Method for reducing line artifacts in a CT image and device for implementing the method
    101.
    发明授权
    Method for reducing line artifacts in a CT image and device for implementing the method 有权
    用于减少CT图像中的线伪影的方法和用于实现该方法的装置

    公开(公告)号：US06411671B2

    公开(公告)日：2002-06-25

    申请号：US09797330

    申请日：2001-03-01

    申请人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer ,  Thomas Von Der Haar

    发明人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer ,  Thomas Von Der Haar

    IPC分类号： A61B600

    CPC分类号： G06T11/005 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612 ,  G06T5/002 ,  G06T5/20 ,  G06T5/50 ,  G06T2207/10081

    摘要： In a method and apparatus for reducing line artifacts in a CT image D1, which is acquired during a scan by a CT device with a detector system having a number of proper detector channels and at least one defective detector channel, the image M1 is obtained first by a median filtering the image D1, which contains a circle artifact on a circle K1. A difference value image F1=D1−M1 is then produced. Filtering then is carried out in each picture element of the image F1 in the direction of the tangents t11 and t21 to the circle K1 extending through the respective picture element in order to produce two resulting images G11 and G21. A correction image D2 is subsequently produced by subtracting the resulting images G11 and G21 from D1.

    摘要翻译： 在减少由具有多个适当检测器通道的检测器系统和至少一个缺陷检测器通道的CT装置的扫描期间获取的CT图像D1中的线伪影的方法和装置中，首先获得图像M1 通过中值滤波在圆K1上包含圆形伪影的图像D1。 然后产生差值图像F1 = D1-M1。 然后在图像F1的每个图像元素中沿切线t11和t21的方向对通过各个图像元素的圆圈K1进行滤波，以便产生两个得到的图像G11和G21。 随后通过从D1中减去所得到的图像G11和G21产生校正图像D2。

    X-ray computed tomography apparatus with radiation detector which reduces image unsharpness
    102.
    发明授权
    X-ray computed tomography apparatus with radiation detector which reduces image unsharpness 失效
    具有放射线检测器的X射线计算机断层摄影装置，其减少图像不清晰度

    公开(公告)号：US6005908A

    公开(公告)日：1999-12-21

    申请号：US46768

    申请日：1998-03-24

    申请人： Arnulf Oppelt ,  Karl Stierstorfer

    发明人： Arnulf Oppelt ,  Karl Stierstorfer

    IPC分类号： A61B6/03 ,  G01T1/20 ,  G01T1/29 ,  A61B6/00

    CPC分类号： G01T1/2985 ,  G01T1/2018

    摘要： An X-ray computed tomography apparatus has a radiation detector composed of X-ray converters so that the scattering of light in a scintillator or the inductive disturbance in a directly converting semiconductor is minimized or eliminated. Each X-ray converter, e.g. a scintillator is in fixed contact with a number of signal converters, e.g. photodiodes. From the output signals of the signal converters, the unsharpness can be calculated and then compensated.

    摘要翻译： X射线计算机断层摄影装置具有由X射线转换器构成的放射线检测器，使得闪烁体中的光的散射或直接转换半导体中的感应扰动被最小化或消除。 每个X射线转换器，例如 闪烁体与许多信号转换器固定接触，例如， 光电二极管 从信号转换器的输出信号，可以计算出不清晰度，然后进行补偿。

    Precise image reconstruction of spiral CT images at optional pitch values
    105.
    发明授权
    Precise image reconstruction of spiral CT images at optional pitch values 有权
    螺旋CT图像的精确图像重建在可选的音调值

    公开(公告)号：US08306304B2

    公开(公告)日：2012-11-06

    申请号：US12462000

    申请日：2009-08-31

    申请人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

    发明人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

    IPC分类号： A61B6/03

    CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4441 ,  A61B6/507 ,  A61B6/5205 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421

    摘要： At least one embodiment of the invention relates to a method for the reconstruction of image data of an examined object from measuring data, wherein the measuring data were detected by a detector within and outside of its Tam-Danielsson window during a relative spiral movement between a radiation source of a computer tomography system and the examined object. As a result of the spiral movement, the measuring data outside of the Tam-Danielsson contain interruptions. A mathematically precise first reconstruction of first image data is realized in at least one embodiment based on the measuring data by using only measuring data from the Tam-Danielsson window. A mathematically precise second reconstruction is furthermore realized of second image data from the measuring data in at least one embodiment, using at least among other things measuring data from outside of the Tam-Danielsson window, wherein the interruption of the measuring data is compensated for by using existing measuring data and/or the first image data and/or other image data obtained from existing measuring data. Finally, the first image data and the second image data are combined.

    摘要翻译： 本发明的至少一个实施例涉及一种用于从测量数据重建被检查对象的图像数据的方法，其中在其Tam-Danielsson窗口内外的检测器检测测量数据， 计算机断层摄影系统的辐射源和检查对象。 由于螺旋运动，Tam-Danielsson以外的测量数据包含中断。 在至少一个实施例中，通过仅使用来自Tam-Danielsson窗口的测量数据，基于测量数据来实现第一图像数据的数学上精确的第一重建。 在至少一个实施例中，使用至少测量来自Tam-Danielsson窗口外部的数据的测量数据的中断，至少在其中测量来自测量数据的第二图像数据的数学上精确的第二重构，其中测量数据的中断由 使用现有测量数据和/或从现有测量数据获得的第一图像数据和/或其他图像数据。 最后，组合第一图像数据和第二图像数据。

    Method And Computer System For The Reduction Of Artifacts In Reconstructed CT Image Datasets
    106.
    发明申请
    Method And Computer System For The Reduction Of Artifacts In Reconstructed CT Image Datasets 有权
    在重建CT图像数据集中减少人工制品的方法和计算机系统

    公开(公告)号：US20120195483A1

    公开(公告)日：2012-08-02

    申请号：US13358624

    申请日：2012-01-26

    申请人： Harald Schöndube ,  Karl Stierstorfer

    发明人： Harald Schöndube ,  Karl Stierstorfer

    IPC分类号： G06K9/00

    CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/5258 ,  G06T5/005 ,  G06T2207/10081 ,  G06T2207/20032

    摘要： A method and computer system are disclosed with software for artifact reduction in CT image datasets for spiral scans from a CT system with an inclined gantry. In at least one embodiment, for each of at least two positions of the center of rotation, which is moved during the spiral scan, the removal of annular artifacts is carried out around these positions, during which the position concerned is used as the center point of the annular artifacts to be removed.

    摘要翻译： 公开了一种方法和计算机系统，其具有用于从具有倾斜机架的CT系统进行螺旋扫描的CT图像数据集中的伪像减少的软件。 在至少一个实施例中，对于在螺旋扫描期间移动的旋转中心的至少两个位置中的每一个，围绕这些位置执行环形伪像的去除，在该位置期间，将所述位置用作中心点 要除去的环形假象。

    Method and image reconstruction device for generating computed tomography image data
    108.
    发明授权
    Method and image reconstruction device for generating computed tomography image data 有权
    用于生成计算机断层摄影图像数据的方法和图像重建装置

    公开(公告)号：US08050480B2

    公开(公告)日：2011-11-01

    申请号：US12453911

    申请日：2009-05-27

    申请人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

    发明人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

    IPC分类号： G06K9/00 ,  A61B6/00

    CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/416 ,  G06T2211/421

    摘要： A method is disclosed for generating computed tomography image data of a volume of interest from X-ray CT data sets generated by a computed tomography system during scanning of an examination subject on a helical path rotating around a longitudinal system axis in the infeed direction. In at least one embodiment, at least two volume-based reconstructions of the volume of interest are performed by way of differential back-projection over surfaces constituted by different groups of M-lines, followed in each case by an inverse Hilbert transformation. The method further includes combining different reconstructed volumes to form a final reconstruction of the volume of interest.

    摘要翻译： 公开了一种用于在扫描受试者的扫描期间由计算机断层摄影系统生成的X射线CT数据集的计算机断层摄影图像数据的生成的方法，所述X射线CT数据集沿着在进给方向上围绕纵向系统轴线旋转的螺旋路径。 在至少一个实施例中，通过在由不同M行组组成的表面上的差异背投影来执行感兴趣体积的至少两个基于体积的重建，然后在每种情况下通过反希尔伯特变换。 该方法还包括组合不同的重建体积以形成感兴趣体积的最终重建。

    CT Image Reconstruction In The Extended Field Of View
    109.
    发明申请
    CT Image Reconstruction In The Extended Field Of View 有权
    CT图像重建在扩展视野

    公开(公告)号：US20110188723A1

    公开(公告)日：2011-08-04

    申请号：US13018724

    申请日：2011-02-01

    申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach ,  Karl Stierstorfer

    发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach ,  Karl Stierstorfer

    IPC分类号： G06K9/00

    CPC分类号： A61B6/4014 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4441 ,  A61B6/482 ,  A61B6/507 ,  G01N23/046 ,  G01N2223/401 ,  G01N2223/419 ,  G01N2223/612 ,  G06T11/006 ,  G06T2211/432

    摘要： A method is disclosed for reconstructing image data of an examination subject from measured data, wherein the measured data was acquired in the course of a relative rotational movement between a radiation source of a computed tomography system and the examination subject. A limited area between the radiation source and a detector represents a field of view in respect of which measured data can be acquired, and parts of the examination subject were located at least temporarily outside the field of view in the course of the measured data acquisition. In at least one embodiment, first image data is reconstructed from the measured data, and a boundary of the examination subject is determined with the aid of the first image data. The first image data is subsequently modified using the determined boundary, and projection data is calculated from the modified first image data. The measured data is modified using the projection data, and finally second image data is reconstructed from the modified measured data.

    摘要翻译： 公开了一种用于从测量数据重建检查对象的图像数据的方法，其中在计算机断层摄影系统的辐射源与检查对象之间的相对旋转运动的过程中获取测量数据。 辐射源和检测器之间的有限区域表示可以获取测量数据的视野，并且在测量数据采集的过程中检查对象的部分至少临时定位在视场外。 在至少一个实施例中，从测量数据重建第一图像数据，借助于第一图像数据确定检查对象的边界。 随后使用所确定的边界修改第一图像数据，并且从修改的第一图像数据计算投影数据。 使用投影数据修改测量数据，最后从修改的测量数据重建第二图像数据。

    CIRCUIT ARRANGEMENT FOR COUNTING X-RAY RADIATION X-RAY QUANTA BY WAY OF QUANTA-COUNTING DETECTORS, AND ALSO AN APPLICATION-SPECIFIC INTEGRATED CIRCUIT AND AN EMITTER-DETECTOR SYSTEM
    110.
    发明申请
    CIRCUIT ARRANGEMENT FOR COUNTING X-RAY RADIATION X-RAY QUANTA BY WAY OF QUANTA-COUNTING DETECTORS, AND ALSO AN APPLICATION-SPECIFIC INTEGRATED CIRCUIT AND AN EMITTER-DETECTOR SYSTEM 有权
    通过计数检测器的方式计算X射线辐射X射线量子的电路布置，还有应用特定的集成电路和发射检测器系统

    公开(公告)号：US20110121191A1

    公开(公告)日：2011-05-26

    申请号：US12953539

    申请日：2010-11-24

    申请人： Steffen KAPPLER ,  Karl Stierstorfer

    发明人： Steffen KAPPLER ,  Karl Stierstorfer

    IPC分类号： G01T1/24

    CPC分类号： G01T1/17

    摘要： A circuit arrangement of a quanta-counting detector with a multiplicity of detector elements is disclosed, wherein the X-ray quanta registered in each detector element generate a signal profile. In at least one embodiment, the circuit arrangement, in each detector element, includes: at least one first comparator with a first energy threshold lying in the energy range of the measured X-ray quanta and at least one second comparator with a second energy threshold lying above the energy range of the measured X-ray quanta, the at least one first and second comparators being connected to the detector element. Further, the at least two comparators have a logical interconnection, wherein at least a first comparator and a second comparator are connected to the inputs of an XOR gate, and each XOR gate connected to a first comparator is connected to precisely one edge-sensitive counter. Further, in at least one embodiment, an application-specific integrated circuit (ASIC) and an emitter-detector system of an X-ray CT system, including at least one circuit arrangement, are disclosed.

    摘要翻译： 公开了具有多个检测器元件的量子计数检测器的电路布置，其中登记在每个检测器元件中的X射线量子产生信号轮廓。 在至少一个实施例中，每个检测器元件中的电路装置包括：具有第一能量阈值的至少一个第一比较器，其位于测量的X射线量子的能量范围内，并且至少一个第二比较器具有第二能量阈值 位于测量的X射线量子的能量范围之上，所述至少一个第一和第二比较器连接到检测器元件。 此外，至少两个比较器具有逻辑互连，其中至少第一比较器和第二比较器连接到异或门的输入，并且连接到第一比较器的每个异或门精确连接到一个边缘敏感计数器 。 此外，在至少一个实施例中，公开了包括至少一个电路装置的X射线CT系统的专用集成电路（ASIC）和发射极 - 检测器系统。