利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

114 条记录 (耗时 0.026 秒)

    Retrospective and/or window-controlled filtering of images for adapting sharpness and noise in computed tomography
    1.
    发明授权
    Retrospective and/or window-controlled filtering of images for adapting sharpness and noise in computed tomography 有权
    用于在计算机断层摄影中适应锐度和噪声的图像的回溯和/或窗口控制滤波

    公开(公告)号：US06901130B2

    公开(公告)日：2005-05-31

    申请号：US10644740

    申请日：2003-08-21

    申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach ,  Stefan Schaller

    发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach ,  Stefan Schaller

    IPC分类号： A61B6/03 ,  G06T1/00 ,  G06T5/00 ,  G06T5/20 ,  G06T11/00

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

    摘要： A method is for window-controlled filtering of CT images. A CT raw data record is acquired, for example, with the aid of a CT unit or of a C-arc unit. A primary data record is then reconstructed from the CT raw data record by way of, for example, a sharp convolution core and, for example, a narrow slice sensitivity profile. A transfer function is then provided as functional relationship between window width and image sharpness. The image sharpness of the CT image of a selected slice is then automatically calculated, situated in the primary data record, as a function of a selected window width for the selected slice by way of an image processing procedure on the basis of the transfer function.

    摘要翻译： 一种用于CT图像窗口控制滤波的方法。 例如，借助于CT单元或C弧单元获取CT原始数据记录。 然后，通过例如锐利的卷积核心和例如窄的片段灵敏度轮廓，从CT原始数据记录重构主数据记录。 然后提供传递函数作为窗口宽度和图像清晰度之间的功能关系。 然后，通过基于传递函数的图像处理过程，将所选切片的CT图像的图像清晰度自动计算为位于主数据记录中的所选切片的选定窗口宽度的函数。

    X-Ray CT system and method for creating tomographic recordings with two x-ray energy spectra
    4.
    发明申请
    X-Ray CT system and method for creating tomographic recordings with two x-ray energy spectra 有权
    X射线CT系统和用于利用两个X射线能谱创建断层摄影记录的方法

    公开(公告)号：US20100092060A1

    公开(公告)日：2010-04-15

    申请号：US12588248

    申请日：2009-10-08

    申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    IPC分类号： G06K9/00

    CPC分类号： A61B6/482 ,  A61B6/032 ,  A61B6/4014 ,  A61B6/507

    摘要： An x-ray CT system and a method are disclosed for creating tomographic recordings with the aid of an x-ray CT system, with two emitter/detector arrangements operating with an angular offset on a gantry with at least two different x-ray energy spectra. In at least one embodiment, at least one first recording is reconstructed from detector data from two quarter rotations with different x-ray energy spectra and at least one second recording is created from detector data of a scan of at least one of the emitter/detector arrangements over a half rotation. According to at least one embodiment of the invention, the recordings are subjected to high-pass filtering or low-pass filtering in respect of their spatial frequencies and then the filtered recordings are combined to give a resulting recording.

    摘要翻译： 公开了一种借助X射线CT系统创建断层摄影记录的X射线CT系统和方法，其中两个发射器/检测器装置在具有至少两个不同x射线能谱的台架上以角度偏移运动 。 在至少一个实施例中，至少一个第一记录是从具有不同X射线能量光谱的二分之一旋转的检测器数据重建的，并且至少一个第二记录是从发射器/检测器中的至少一个的扫描的检测器数据产生的 安排半圈以上。 根据本发明的至少一个实施例，记录对其空间频率进行高通滤波或低通滤波，然后组合滤波后的记录以得到最终的记录。

    Scanning and reconstruction method of a CT system and CT system
    6.
    发明授权
    Scanning and reconstruction method of a CT system and CT system 有权
    CT系统和CT系统的扫描和重建方法

    公开(公告)号：US08189734B2

    公开(公告)日：2012-05-29

    申请号：US12686413

    申请日：2010-01-13

    申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    IPC分类号： A61B6/00

    CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/507 ,  G06T2211/412 ,  G06T2211/421

    摘要： A method is disclosed for scanning an examination object with a CT system and the generation of at least one computed tomographic sectional view from data obtained from the scanning and a CT system. In at least one embodiment, data used for generating the at least one sectional image is filtered out with different intensities as a function of a predetermined time range and/or projection angle range of the measurement of high local frequencies.

    摘要翻译： 公开了一种用于使用CT系统扫描检查对象并从从扫描和CT系统获得的数据生成至少一个计算机断层图截面视图的方法。 在至少一个实施例中，用于产生至少一个截面图像的数据作为预定时间范围和/或高本地频率的测量的投影角范围的函数以不同的强度被滤除。

    CT Image Reconstruction In The Extended Field Of View
    7.
    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。

    Method for producing tomographic images, control device, tomography unit and computer program product
    8.
    发明授权
    Method for producing tomographic images, control device, tomography unit and computer program product 有权
    断层摄影图像的制作方法，控制装置，断层摄像机和计算机程序产品

    公开(公告)号：US07970097B2

    公开(公告)日：2011-06-28

    申请号：US12458806

    申请日：2009-07-23

    申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    IPC分类号： A61B6/00

    CPC分类号： A61B5/0456 ,  A61B6/027 ,  A61B6/032 ,  A61B6/503 ,  A61B6/504 ,  A61B6/541

    摘要： A method is disclosed for producing tomographic images relating to different movement phases of a periodically moving object with the use of a tomography unit that includes a recording system that is arranged rotatably about a z-axis of the tomography unit, the recording system including an X-ray tube to which a tube current can be applied and a detector (17, 18) for acquiring projections. In at least one embodiment, the recording system is initially positioned relative to the object at a first z-position, and projections are acquired from a multiplicity of different projection dimensions at this z-position, in a fashion triggered by a movement signal representing the movement of the object, projections relating to a first movement phase of the object being acquired in a prospectively defined first time window and projections relating to at least a second movement phase of the object being acquired in a prospectively defined second time window. In at least one embodiment, a modulation of the tube current is performed in such a way that different tube current values are set in the first and the second time window to attain a prescribable different signal-to-noise ratio in the produced images. The recording system is then positioned sequentially at further z-positions, and respectively corresponding projections are acquired there for the two movement phases until a prescribed examination area is scanned at the desired z-positions. Tomographic images are reconstructed in real time or subsequently on the basis of the obtained projections.

    摘要翻译： 公开了一种利用断层摄影单元生成与周期性运动物体的不同移动相位相关的断层图像的方法，所述断层摄影单元包括绕所述断层摄影单元的z轴可旋转地设置的记录系统，所述记录系统包括X 可以施加管电流的射线管和用于获取突起的检测器（17,18）。 在至少一个实施例中，记录系统首先在第一z位置处相对于物体定位，并且以该Z位置上的多个不同的投影尺寸获取投影，其方式是由表示 物体的移动，与在前瞻性定义的第一时间窗口中获取的物体的第一移动阶段有关的投影以及与在前瞻性定义的第二时间窗口中获取的物体的至少第二移动阶段有关的投影。 在至少一个实施例中，以这样的方式执行管电流的调制，使得在第一和第二时间窗中设置不同的管电流值，以在所产生的图像中获得规定的不同的信噪比。 然后将记录系统顺序地定位在更进一步的z位置，并且分别在两个移动阶段获取对应的投影，直到在期望的z位置扫描规定的检查区域。 断层扫描图像可以实时重建，或随后根据获得的投影进行重构。

    CT IMAGE RECONSTRUCTION FOR IMPROVING TEMPORAL RESOLUTION IN CARDIO CT
    9.
    发明申请
    CT IMAGE RECONSTRUCTION FOR IMPROVING TEMPORAL RESOLUTION IN CARDIO CT 有权
    用于改善心脏CT中的时间分辨率的CT图像重建

    公开(公告)号：US20110033097A1

    公开(公告)日：2011-02-10

    申请号：US12849082

    申请日：2010-08-03

    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： A61B6/032 ,  A61B5/0456 ,  A61B6/4014 ,  A61B6/482 ,  A61B6/503 ,  A61B6/507 ,  G06T11/006 ,  G06T2211/412 ,  G06T2211/424 ,  G06T2211/436

    摘要： A method is disclosed for reconstructing image data of a moving examination object from measurement data, wherein the measurement data was captured in the course of a relative rotational movement between a radiation source of a computed tomography system and the examination object. In at least one embodiment of the method, a first image of the examination object is calculated from a complete measurement data record of the measurement data for an image reconstruction and a second image of the examination object is calculated from an incomplete measurement data record of the measurement data for an image reconstruction. Frequency splitting of the first and second images takes place respectively in at least one low-frequency and one higher-frequency component and the image data of the second image is supplemented in the low-frequency component with image data of the low-frequency component of the first image. In a further processing step the second image thus supplemented is improved using the first image, in that errors due to the incompleteness of the measurement data record of the second image are reduced.

    摘要翻译： 公开了一种用于从测量数据重建运动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和检查对象之间的相对旋转运动的过程中捕获测量数据。 在该方法的至少一个实施例中，根据用于图像重构的测量数据的完整测量数据记录来计算检查对象的第一图像，并且从不完整的测量数据记录计算检查对象的第二图像 用于图像重建的测量数据。 第一和第二图像的频率分割分别发生在至少一个低频和一个较高频分量中，并且第二图像的图像数据在低频分量中被补充，低频分量的图像数据是 第一张图片。 在另外的处理步骤中，使用第一图像来改善如此补充的第二图像，因为减少了由于第二图像的测量数据记录的不完备性造成的错误。

    Method for reduction of the radiation dose used within the framework of an X-ray imaging examination and CT system
    10.
    发明授权
    Method for reduction of the radiation dose used within the framework of an X-ray imaging examination and CT system 有权
    降低X射线成像检查和CT系统框架内使用的辐射剂量的方法

    公开(公告)号：US08615122B2

    公开(公告)日：2013-12-24

    申请号：US13273504

    申请日：2011-10-14

    申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach

    IPC分类号： G06K9/00 ,  A61B6/00

    CPC分类号： A61B6/5258 ,  A61B6/5211 ,  G06T5/002 ,  G06T5/30 ,  G06T11/005 ,  G06T2207/10081 ,  G06T2207/20036 ,  G06T2207/20192

    摘要： A method and an X-ray system are disclosed for reduction of the radiation dose used within the framework of an imaging X-ray examination. In at least one embodiment, for each pixel of a recorded image, structure information of a structure which may be present at a distance around the examined pixel is determined and a direction-dependent lowpass filter is applied to the pixel examined in each case, which filter's spatial coverage is less than the distance and which takes into account the morphological information of a structure which may be present with a direction-dependent weighting of the lowpass filter.

    摘要翻译： 公开了用于减少在成像X射线检查的框架内使用的辐射剂量的方法和X射线系统。 在至少一个实施例中，对于记录图像的每个像素，确定可能存在于被检查像素周围的距离处的结构的结构信息，并且将方向依赖的低通滤波器应用于在每种情况下检查的像素， 滤波器的空间覆盖小于距离，并且考虑到可能存在与低通滤波器的方向相关的加权的结构的形态信息。