公开(公告)号：US20080232546A1

公开(公告)日：2008-09-25

申请号：US11896213

申请日：2007-08-30

申请人： Karl Stierstorfer

发明人： Karl Stierstorfer

IPC分类号： G01N23/20

CPC分类号： G03B42/02 ,  A61B6/583 ,  A61B6/585 ,  G01N23/046 ,  G01N2223/419 ,  H04N5/325

摘要： A method is disclosed for scattered radiation correction in X-ray imaging, and an X-ray imaging system is disclosed for carrying out the method. In at least one embodiment of the method, measurement signals t from an X-ray detector are digitized and converted to logarithmic form, with these measurement signals t having been obtained by radiation through an examination object by the X-ray detector. Correction values which have been obtained from a series development of a logarithm 1n(1−s/t) are subtracted from the measurement signals that have been converted to logarithmic form, with this series development being terminated at the earliest after the first order, where s denotes a previously determined scattered radiation signal from radiation passed through the examination object. At least one embodiment of the method and the associated X-ray imaging system allow scattered radiation to be corrected for with increased accuracy, on the basis of measurement signals that had been converted to logarithmic form.

摘要翻译： 公开了用于X射线成像中的散射辐射校正的方法，并且公开了用于执行该方法的X射线成像系统。 在该方法的至少一个实施例中，来自X射线检测器的测量信号t被数字化并转换为对数形式，其中这些测量信号t已经通过X射线检测器通过检查对象的辐射获得。 从已经被转换成对数形式的测量信号中减去从对数1n（1-s / t）的系列展开获得的校正值，该系列开发在第一次之后最早终止，其中 s表示来自经过检查对象的辐射的预先确定的散射辐射信号。 该方法和相关联的X射线成像系统的至少一个实施例基于已被转换成对数形式的测量信号，允许以更高的精度校正散射辐射。

公开(公告)号：US20080048126A1

公开(公告)日：2008-02-28

申请号：US11798389

申请日：2007-05-14

申请人： Silke Janssen ,  Karl Stierstorfer

发明人： Silke Janssen ,  Karl Stierstorfer

IPC分类号： G01T1/00

CPC分类号： H04N5/32 ,  G01T1/2985 ,  G03B42/02

摘要： An X-ray detector is disclosed for detecting individual quanta. In at least one embodiment, the X-ray detector includes a plurality of detector elements and an evaluation unit that is connected to the latter for data purposes and is set up in such a way that each detector element is assigned a first energy threshold, wherein in each case one portion of various radiation spectra that can be picked up by the detector element exhibits an energy below the energy threshold, and a further portion of the respective radiation spectrum exhibits an energy above the energy threshold. Further, the energy thresholds of the various detector elements are set in a different fashion in such a way that the ratio between the portion, exhibiting an energy above or below the energy threshold in the case of a first radiation spectrum, of the radiation spectrum and the portion, exhibiting an energy above or below the energy threshold in the case of a second radiation spectrum, of the radiation spectrum is intermatched in the case of the various detector elements.

摘要翻译： 公开了用于检测单个量子的X射线检测器。 在至少一个实施例中，X射线检测器包括多个检测器元件和评估单元，其连接到后者用于数据目的，并且被设置成使得每个检测器元件被分配有第一能量阈值，其中 在每种情况下，可以由检测器元件拾取的各种辐射光谱的一部分表现出低于能量阈值的能量，并且相应辐射光谱的另一部分表现出高于能量阈值的能量。 此外，各种检测器元件的能量阈值以不同的方式设置，使得在辐射光谱的第一辐射光谱的情况下，表现出高于或低于能量阈值的能量的部分之间的比率，以及 在各种检测器元件的情况下，在第二辐射光谱的情况下，表现出高于或低于能量阈值的能量的部分的辐射光谱的部分是互配的。

公开(公告)号：US07277524B2

公开(公告)日：2007-10-02

申请号：US11169913

申请日：2005-06-30

申请人： Herbert Bruder ,  Thomas Flohr ,  Ernst Klotz ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Thomas Flohr ,  Ernst Klotz ,  Karl Stierstorfer

IPC分类号： A61B6/00

CPC分类号： A61B6/032 ,  A61B5/1075 ,  A61B6/027 ,  A61B6/4085 ,  A61B6/461 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612

摘要： A method is disclosed for a multislice computer assisted tomograph, capable of carrying out a spiral scan of an object volume with a pitch p selected to be small enough that each slice of the object volume is multiply detected during the spiral scan. The method includes calculating, using measured data of two temporally consecutive at least one of revolutions and half revolutions, an image of the object volume from which a change inside the object volume between the two temporally consecutive at least one of revolutions and half revolutions is directly visible. An embodiment of the method can permit, for example, the detection and visualization of dynamic processes with an enhanced time resolution.

摘要翻译： 公开了一种用于多层计算机辅助断层摄影机的方法，其能够对所选择的节距p的物体体积进行螺旋扫描，所述间距p被选择为足够小，使得在螺旋扫描期间对对象体积的每个切片进行乘法检测。 该方法包括使用两个时间上连续的至少一个旋转和半圈的测量数据来计算在两个时间上连续的至少一个转和半转之间的对象体积内的变化直接在其中的对象体积的图像 可见。 该方法的实施例可以允许例如具有增强的时间分辨率的动态过程的检测和可视化。

公开(公告)号：US07238944B2

公开(公告)日：2007-07-03

申请号：US10507896

申请日：2003-03-07

申请人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer

IPC分类号： G01T1/20

CPC分类号： G01T1/2018 ,  G01T1/1642 ,  G21K1/025

摘要： A detector for x-ray computer tomography scanners, includes a number of adjacent detector lines extending in an x direction, whereby each detector line is formed from a multitude of adjacent scintillator elements. In order to increase the resolution in the z direction and to simplify the design of the detector, the surface of the scintillator elements are partially covered, which further serves to reduce the size of the aperture in the z direction.

摘要翻译： 用于x射线计算机断层扫描仪的检测器包括沿x方向延伸的多个相邻的检测器线，由此每个检测器线由多个相邻的闪烁体元件形成。 为了提高z方向的分辨率和简化检测器的设计，闪烁体元件的表面被部分地覆盖，这进一步用于减小孔径在z方向上的尺寸。

公开(公告)号：US20070093711A1

公开(公告)日：2007-04-26

申请号：US11584544

申请日：2006-10-23

申请人： Martin Hoheisel ,  Wolfgang Harer ,  Holger Kunze ,  Karl Stierstorfer

发明人： Martin Hoheisel ,  Wolfgang Harer ,  Holger Kunze ,  Karl Stierstorfer

IPC分类号： A61B5/05

CPC分类号： G01N23/046 ,  A61B6/032 ,  A61B6/583 ,  G01N2223/419 ,  G01N2223/612 ,  G06T11/005 ,  G06T2211/421 ,  G06T2211/424

摘要： A method is disclosed for reconstructing a tomographic representation of an object from projection data off a moving radiation source through this object onto a detector, filtering and back projection of the projection data being executed in the reconstruction. In an embodiment of the method, by using at least one identical spatial arrangement of the radiation source, the detector and a test object instead of the object to be scanned, there is determined by test projections and an iterative reconstruction technique, a filter that in the given arrangement results in an optimum filtering and back projection of the projection data of the test object for the tomographic representation. Further, the object is scanned instead of the test object in the given arrangement and projection data are determined. Finally, the reconstruction of the tomographic representation is carried out using these projection data and the filter determined. Moreover, an embodiment of a tomography unit for carrying out this method is also disclosed.

摘要翻译： 公开了一种用于将通过该物体的运动辐射源的投影数据从物体重建成检测器的方法，对重建中正在执行的投影数据进行滤波和反投影。 在该方法的一个实施例中，通过使用辐射源，检测器和测试对象的至少一个相同的空间排列而不是要扫描的对象，通过测试投影和迭代重建技术来确定滤波器， 给定的布置导致用于断层图像的测试对象的投影数据的最佳滤波和反投影。 此外，在给定的布置中扫描对象而不是测试对象，并且确定投影数据。 最后，使用这些投影数据并确定滤波器来进行断层图像的重建。 此外，还公开了用于执行该方法的断层摄影单元的实施例。

公开(公告)号：US20060198493A1

公开(公告)日：2006-09-07

申请号：US11365583

申请日：2006-03-02

申请人： Claus Pohan ,  Mario Reinwand ,  Karl Stierstorfer

发明人： Claus Pohan ,  Mario Reinwand ,  Karl Stierstorfer

IPC分类号： H05G1/60 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

CPC分类号： A61B6/06 ,  A61B6/032 ,  G01T1/295 ,  G21K1/02

摘要： A shadow mask and method for adjustment are disclosed. The shadow mask may be for an X-ray detector including detector elements, which may further be provided for a computed tomography unit, for example. The shadow mask has a mask plate with holes of which each is assigned a detector element. At least one adjusting hole of the mask plate includes enlarged dimensions in such a way that it is adapted to the dimensions of at least two detector elements. The adjusting hole serves for the method of adjusting the shadow mask over the X-ray detector. Measurement signals of the detector elements that are assigned to the at least one adjusting hole, are determined by using X-radiation. The shadow mask and the X-ray detector are adjusted relative to one another on the basis of a comparison of the measurement signals of the detector elements.

公开(公告)号：US06658081B2

公开(公告)日：2003-12-02

申请号：US10164234

申请日：2002-06-05

申请人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4085 ,  A61B6/4233 ,  Y10S378/901

摘要： In a method and apparatus for computed tomography, a subject is scanned with a conical ray beam emanating from a focus and the attenuated beam is detected with a matrix-like detector array. The focus is moved on a spiral path around a system axis relative to the subject, and the detector array supplies output data corresponding to the received radiation. The output data are supplied during the motion of the focus on a spiral segment and have a length adequate for the reconstruction of a CT image, and are divided into output datasets with respect to sub-segments. Segment images having an inclined image plane relative to the system axis are reconstructed for the sub-segments. The segment images respectively belonging to the sub-segments are combined into a partial image with respect to a target image plane, and the partial images are combined into a resulting CT image with respect to the target image plane.

公开(公告)号：US08744161B2

公开(公告)日：2014-06-03

申请号：US13401879

申请日：2012-02-22

申请人： Thomas Flohr ,  Martin Petersilka ,  Karl Stierstorfer

发明人： Thomas Flohr ,  Martin Petersilka ,  Karl Stierstorfer

IPC分类号： G06K9/00

CPC分类号： G01N23/046 ,  A61B6/032 ,  A61B6/06 ,  A61B6/4014 ,  A61B6/4291 ,  A61B6/5205 ,  A61B6/5282 ,  G01N2223/419 ,  G01N2223/612 ,  G06T11/005 ,  G06T2211/424

摘要： A method and a computer system are disclosed for scattered beam correction in a CT examination of an object in a multi source CT. In at least one embodiment, the method includes generating original projection data records; reconstruction of the object with the original projection data records of at least one detector; determining the scattered radiation generated by each emitter exclusively in the direction of the original beams of the at least one other emitter relative to its opposing detector; generating corrected projection data records by removing the calculated scattered radiation from the original projection data records; reconstruction of the object with the corrected projection data records, and implementing a further iteration of the method when determining the scattered radiation or issuing the reconstruction result if at least one predetermined abort criterion applies.

摘要翻译： 公开了一种用于在多源CT中的对象的CT检查中的散射束校正的方法和计算机系统。 在至少一个实施例中，该方法包括生成原始投影数据记录; 用至少一个检测器的原始投影数据记录重建对象; 确定由每个发射器产生的散射辐射源专用于至少一个其它发射器的原始光束相对于其相对的检测器的方向; 通过从原始投影数据记录中去除计算的散射辐射来产生校正的投影数据记录; 使用校正的投影数据记录重建对象，并且如果应用至少一个预定中止标准，则在确定散射辐射或发出重建结果时，执行该方法的进一步迭代。

公开(公告)号：US08588493B2

公开(公告)日：2013-11-19

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。

公开(公告)号：US08442293B2

公开(公告)日：2013-05-14

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 ,  A61B6/00

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。