公开(公告)号：US20100296624A1

公开(公告)日：2010-11-25

申请号：US12445765

申请日：2007-10-16

申请人： Claas Bontus ,  Roland Proksa ,  Thomas Koehler

发明人： Claas Bontus ,  Roland Proksa ,  Thomas Koehler

IPC分类号： A61B6/03

CPC分类号： A61B6/503 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4021 ,  A61B6/4085 ,  A61B6/541

摘要： If, in cardiac CT, the time window becomes shorter than the time required for a complete rotation of the gantry, the volume that can be reconstructed becomes small due to the non-existence of related pi-lines. According to an exemplary embodiment of the present invention, an examination apparatus is provided which generates a radiation beam oscillating in z-direction with an oscillation frequency higher than the rotational frequency of the source. This may provide for an exact image reconstruction of large volumes.

摘要翻译： 如果在心脏CT中，时间窗口变得比台架完全旋转所需的时间短，则由于不存在相关的pi线，可重构的体积变小。 根据本发明的示例性实施例，提供了一种检查装置，其产生以比源的旋转频率高的振荡频率在z方向上振荡的辐射束。 这可以提供大体积的精确图像重建。

公开(公告)号：US08401144B2

公开(公告)日：2013-03-19

申请号：US12535231

申请日：2009-08-04

申请人： Peter Forthmann ,  Axel Thran ,  Claas Bontus ,  Roland Proksa

发明人： Peter Forthmann ,  Axel Thran ,  Claas Bontus ,  Roland Proksa

IPC分类号： G01N23/083 ,  H05G1/60

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/488 ,  G06T5/50 ,  G06T11/005 ,  G06T2207/10072 ,  G06T2211/432

摘要： A scanning method and apparatus useful for correcting artifacts which may appear in a primary short circular CT scan are provided. A secondary helical scan performed on a stationary subject, or a secondary circular scan, may be used to correct for artifacts. The secondary scan may be performed with a smaller radiation dosage than the primary circular CT scan.

摘要翻译： 提供了可用于校正可能出现在初级短圆形CT扫描中的伪影的扫描方法和装置。 可以使用在静止对象上进行的辅助螺旋扫描或二次循环扫描来校正伪像。 次扫描可以以比初级圆形CT扫描更小的辐射剂量进行。

公开(公告)号：US20110058644A1

公开(公告)日：2011-03-10

申请号：US12990278

申请日：2009-04-30

申请人： Axel Thran ,  Claas Bontus ,  Peter Forthmann ,  Roland Proksa ,  Ronald B. Sharpless ,  Dominic J. Heuscher ,  Felix Peeters ,  Johannes Bathazar Maria Soetens

发明人： Axel Thran ,  Claas Bontus ,  Peter Forthmann ,  Roland Proksa ,  Ronald B. Sharpless ,  Dominic J. Heuscher ,  Felix Peeters ,  Johannes Bathazar Maria Soetens

IPC分类号： A61B6/03 ,  G01T1/24

CPC分类号： A61B6/4447 ,  A61B6/06 ,  A61B6/4021

摘要： A medical imaging system includes a generally stationary gantry (102) and a rotating gantry (106), rotatably supported by the generally stationary gantry (102), that rotates about a longitudinal axis around an examination region. The medical imaging system further includes a radiation source (112) that emits a radiation beam that traverses the examination region. The radiation source (112) is moveably affixed to the rotating gantry (106) so as to translate in a direction of the longitudinal axis with respect to the rotating gantry (106) while scanning a subject in the examination region. The medical imaging system further includes a detector array (120) that detects the radiation beam that traverses the examination region and generates a signal indicative thereof. The detector array (120) is moveably affixed to the rotating gantry (106) so as to move in coordination with the radiation source (112) while scanning the subject in the examination region.

摘要翻译： 医疗成像系统包括大致固定的机架（102）和旋转支架（106），旋转机架（106）由大体上固定的机架（102）可旋转地支撑，围绕检查区域围绕纵向轴线旋转。 医疗成像系统还包括发射穿过检查区域的辐射束的辐射源（112）。 辐射源（112）可移动地固定到旋转机架（106）上，以便在扫描检查区域中的被检体的同时相对于旋转台架（106）在纵向轴线的方向上平移。 医疗成像系统还包括检测器阵列（120），其检测穿过检查区域的辐射束并产生指示其的信号。 检测器阵列（120）可移动地固定到旋转机架（106），以在扫描检查区域中的对象时与辐射源（112）协调地移动。

公开(公告)号：US08693621B2

公开(公告)日：2014-04-08

申请号：US12990278

申请日：2009-04-30

申请人： Axel Thran ,  Claas Bontus ,  Peter Forthmann ,  Roland Proksa ,  Ronald B. Sharpless ,  Dominic J. Heuscher ,  Felix Peeters ,  Johannes Bathazar Maria Soetens

发明人： Axel Thran ,  Claas Bontus ,  Peter Forthmann ,  Roland Proksa ,  Ronald B. Sharpless ,  Dominic J. Heuscher ,  Felix Peeters ,  Johannes Bathazar Maria Soetens

IPC分类号： A61B6/03

CPC分类号： A61B6/4447 ,  A61B6/06 ,  A61B6/4021

摘要： A medical imaging system includes a generally stationary gantry (102) and a rotating gantry (106), rotatably supported by the generally stationary gantry (102), that rotates about a longitudinal axis around an examination region. The medical imaging system further includes a radiation source (112) that emits a radiation beam that traverses the examination region. The radiation source (112) is moveably affixed to the rotating gantry (106) so as to translate in a direction of the longitudinal axis with respect to the rotating gantry (106) while scanning a subject in the examination region. The medical imaging system further includes a detector array (120) that detects the radiation beam that traverses the examination region and generates a signal indicative thereof. The detector array (120) is moveably affixed to the rotating gantry (106) so as to move in coordination with the radiation source (112) while scanning the subject in the examination region.

摘要翻译： 医疗成像系统包括大致固定的机架（102）和旋转支架（106），旋转机架（106）由大体上固定的机架（102）可旋转地支撑，围绕检查区域围绕纵向轴线旋转。 医疗成像系统还包括发射穿过检查区域的辐射束的辐射源（112）。 辐射源（112）可移动地固定到旋转机架（106）上，以便在扫描检查区域中的被检体的同时相对于旋转台架（106）在纵向轴线的方向上平移。 医疗成像系统还包括检测器阵列（120），其检测穿过检查区域的辐射束并产生指示其的信号。 检测器阵列（120）可移动地固定到旋转机架（106），以在扫描检查区域中的对象时与辐射源（112）协调地移动。

公开(公告)号：US07672490B2

公开(公告)日：2010-03-02

申请号：US10597871

申请日：2005-02-04

申请人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

发明人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

IPC分类号： G06K9/00 ,  A61B6/00 ,  A61B5/05

CPC分类号： G06T11/005 ,  A61B6/027 ,  G06T2211/412

摘要： Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.

摘要翻译： 运动是螺旋锥束CT中最重要的文物来源之一。 通过比较与投影数据相对应的相对射线，可以估计运动量，并且可以根据本发明的示例性实施例来执行以下对相应运动伪像的抑制。 运动伪像补偿的方法可以在近似重建算法和精确重构算法中实现。 有利地，自动检测数据采集期间的运动，并且可以自适应地抑制相关的运动伪像。

公开(公告)号：US20070177713A1

公开(公告)日：2007-08-02

申请号：US10597871

申请日：2005-02-04

申请人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

发明人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

IPC分类号： H05G1/60 ,  G06K9/00 ,  G01N23/00 ,  G21K1/12

CPC分类号： G06T11/005 ,  A61B6/027 ,  G06T2211/412

摘要： Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.

摘要翻译： 运动是螺旋锥束CT中最重要的文物来源之一。 通过比较与投影数据相对应的相对射线，可以估计运动量，并且可以根据本发明的示例性实施例来执行以下对相应运动伪像的抑制。 运动伪像补偿的方法可以在近似重建算法和精确重构算法中实现。 有利地，自动检测数据采集期间的运动，并且可以自适应地抑制相关的运动伪像。

公开(公告)号：US20090268863A1

公开(公告)日：2009-10-29

申请号：US11913821

申请日：2006-05-03

申请人： Thomas Koehler ,  Claas Bontus ,  Peter Koken

发明人： Thomas Koehler ,  Claas Bontus ,  Peter Koken

IPC分类号： H05G1/60 ,  G06K9/00

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

摘要： The invention relates to a method and a system for the reconstruction of an object function (f(x)) based on projections acquired during the motion of a radiation source on a helical trajectory (17). The method is particularly suited for an n-PI+ acquisition which by definition completely comprises an n-PI and additionally some overscan data from the (n+2)−PI window. According to the method, two sets (Σ≧m, Σ≧m) of filtered projections are generated from the measuring values and separately back-projected to yield two absorption functions. The first absorption function (flf(x)) is based on contributions of Radon-planes with at most m intersections with the source trajectory (17), while the second absorption function (fhf(x)) is based on Radon-planes with more than m intersections with the source trajectory (17). The two absorption functions are added to yield the final absorption function (f(x)) of an object in the examination zone. In an approximative version of the method, the sets (Σ≧m, Σ≧m) of filtered projections are first added and then back-projected.

摘要翻译： 本发明涉及一种用于基于在螺旋轨迹（17）上的辐射源的运动期间获取的投影来重建对象函数（f（x））的方法和系统。 该方法特别适用于n-PI +采集，其通过定义完全包括n-PI，并且另外还包括来自（n + 2）-PI窗口的一些过扫描数据。 根据该方法，从测量值产生经滤波的投影的两组（Sigma> = m，Sigma> = m），并单独反投影以产生两个吸收函数。 第一吸收函数（flf（x））基于与源轨迹（17）最多m个交点的氡面的贡献，而第二吸收函数（fhf（x））基于具有更多的氡面 而不是与源轨迹（17）的交点。 添加两个吸收函数以产生检查区中物体的最终吸收函数（f（x））。 在该方法的近似版本中，首先添加滤波投影的集合（Sigma> = m，Sigma> = m），然后反投影。

公开(公告)号：US07778387B2

公开(公告)日：2010-08-17

申请号：US11913821

申请日：2006-05-03

申请人： Thomas Koehler ,  Claas Bontus ,  Peter Koken

发明人： Thomas Koehler ,  Claas Bontus ,  Peter Koken

IPC分类号： A61B6/00

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

摘要： The invention relates to a method and a system for the reconstruction of an object function (f(x)) based on projections acquired during the motion of a radiation source on a helical trajectory (17). The method is particularly suited for an n-PI+ acquisition which by definition completely comprises an n-PI and additionally some overscan data from the (n+2)-PI window. According to the method, two sets (Σ≦m, Σ>m) of filtered projections are generated from the measuring values and separately back-projected to yield two absorption functions. The first absorption function (flf(x)) is based on contributions of Radon-planes with at most m intersections with the source trajectory (17), while the second absorption function (fhf(x)) is based on Radon-planes with more than m intersections with the source trajectory (17). The two absorption functions are added to yield the final absorption function (f(x)) of an object in the examination zone. In an approximative version of the method, the sets (Σ≦m, Σ>m) of filtered projections are first added and then back-projected.

摘要翻译： 本发明涉及一种用于基于在螺旋轨迹（17）上的辐射源的运动期间获取的投影来重建对象函数（f（x））的方法和系统。 该方法特别适用于n-PI +采集，其通过定义完全包括n-PI，并且另外还包括来自（n + 2）-PI窗口的一些过扫描数据。 根据该方法，从测量值产生两组滤波投影（＆Sgr;＆nlE; m，＆Sgr？m），并分别反投影以产生两个吸收函数。 第一吸收函数（flf（x））基于与源轨迹（17）最多m个交点的氡面的贡献，而第二吸收函数（fhf（x））基于具有更多的氡面 而不是与源轨迹（17）的交点。 添加两个吸收函数以产生检查区中物体的最终吸收函数（f（x））。 在方法的近似版本中，首先添加过滤投影的集合（＆Sgr;＆nlE; m，＆Sgr;> m），然后反投影。

公开(公告)号：US09466135B2

公开(公告)日：2016-10-11

申请号：US13388068

申请日：2010-07-09

申请人： Thomas Koehler ,  Claas Bontus

发明人： Thomas Koehler ,  Claas Bontus

IPC分类号： G06K9/00 ,  G06T11/00 ,  A61B6/00

CPC分类号： G06T11/006 ,  A61B6/5258 ,  G06T2211/424 ,  G06T2211/432

摘要： A method and system to perform region-of-interest (ROI) reconstruction is provided, even if the original projection data are truncated. The reconstruction is performed on a superset of the ROI, including the ROI as well as other areas which are outside the scan field-of-view of the imaging system but still within the imaging bore.

摘要翻译： 即使原始投影数据被截断，也提供了执行感兴趣区域（ROI）重构的方法和系统。 重建在ROI的超集上执行，包括ROI以及在成像系统的扫描视场外但仍在成像孔内的其它区域。

公开(公告)号：US07889901B2

公开(公告)日：2011-02-15

申请号：US11815606

申请日：2006-01-31

申请人： Claas Bontus ,  Michael Grass ,  Thomas Koehler

发明人： Claas Bontus ,  Michael Grass ,  Thomas Koehler

IPC分类号： G06K9/00 ,  A61B6/00

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

摘要： The invention relates to a computed tomography method in which a periodically moving object is irradiated by a conical beam bundle. An nPi-relative movement is generated between a radiation source, which generates the conical beam bundle, and the object. During the nPi-relative movement, measured values are acquired, which depend on the intensity in the beam bundle on the other side of the object and from these measured values filter values are determined, which are divided into different groups. The filter values of at least one group are weighted in dependence on the movement of the object, wherein, when filter values of several groups are weighted, filter values of different groups are weighted differently in dependence on the movement of the object. Finally, a CT image of the object is reconstructed from the filter values.

摘要翻译： 本发明涉及一种计算机断层摄影方法，其中周期性移动的物体被锥形束束照射。 在产生锥形束束的辐射源和物体之间产生nPi相对运动。 在nPi相对运动期间，获取测量值，其取决于物体另一侧上的束束中的强度，并且从这些测量值确定滤波器值，其被划分为不同的组。 根据对象的移动对至少一个组的滤波器值进行加权，其中当对多个组的滤波器值进行加权时，根据对象的移动对不同组的滤波器值进行加权不同。 最后，从过滤器值重建对象的CT图像。