公开(公告)号：US07242749B2

公开(公告)日：2007-07-10

申请号：US11273851

申请日：2005-11-15

申请人： Jiang Hsieh ,  Alexander Katsevich ,  Samit Kumar Basu

发明人： Jiang Hsieh ,  Alexander Katsevich ,  Samit Kumar Basu

IPC分类号： G21K1/04

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/06 ,  G21K1/04

摘要： Methods and systems for controlling x-ray exposure during a dynamic pitch helical scan using a translatable table are provided. The system includes a collimator positioned between an x-ray source and an object to be scanned configured to shutter an x-ray fan beam generated by the x-ray source to at least one of translate the x-ray fan beam along a z-axis of the scan and vary the width of the x-ray beam along the z-axis, and a collimator controller configured to dynamically position the collimator using at least one of predetermined trajectory of the translatable table and a current position of the translatable table.

公开(公告)号：US20070147575A1

公开(公告)日：2007-06-28

申请号：US11581160

申请日：2006-10-13

申请人： Alexander Katsevich

发明人： Alexander Katsevich

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

CPC分类号： G01N23/046 ,  A61B6/027 ,  A61B6/032 ,  G01N2223/419 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： Methods, systems and processes for providing efficient image reconstruction using local cone beam tomography which provide a reduced level of artifacts without suppressing the strength of the useful features; and in a dynamic case provide reconstruction of objects that are undergoing a change during the scan. An embodiment provides a method of reconstructing an image from cone beam data provided by at least one detector. The method includes collecting CB projection data of an object, storing the CB projection data in a memory; and reconstructing the image from the local CB projection data. In the reconstructing step, a combination of derivatives of the CB projection data that will result in suppressing the artifacts are found. The combination of derivatives includes collecting cone beam data that represents a collection of integrals that represent the object.

摘要翻译： 用于使用局部锥束断层摄影提供有效图像重建的方法，系统和过程，其提供减少的伪影水平而不抑制有用特征的强度; 并且在动态情况下提供在扫描期间正在经历改变的对象的重建。 一个实施例提供了一种从由至少一个检测器提供的锥形束数据重建图像的方法。 该方法包括收集对象的CB投影数据，将CB投影数据存储在存储器中; 并从本地CB投影数据重建图像。 在重建步骤中，发现将导致抑制伪像的CB投影数据的导数的组合。 衍生物的组合包括收集表示该物体的积分集合的锥形束数据。

公开(公告)号：US06574299B1

公开(公告)日：2003-06-03

申请号：US10143160

申请日：2002-05-10

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： A61B603

CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： Reconstructing images of objects spirally scanned with two-dimensional detectors with a novel algorithm. The image reconstruction process is proven to create an exact image of the object under the ideal circumstances. The algorithm has an FBP (Filtered Back Projection) structure and works very efficiently. The algorithm uses less computer power and combines the benefits of Exact Algorithms and Approximate algorithms.

摘要翻译： 用新颖的算法重建用二维检测器螺旋扫描的物体的图像。 图像重建过程被证明可以在理想情况下创建物体的精确图像。 该算法具有FBP（Filtered Back Projection）功能，效率非常高。 该算法使用较少的计算机能力，并结合了精确算法和近似算法的优点。

公开(公告)号：US07010079B2

公开(公告)日：2006-03-07

申请号：US10728136

申请日：2003-12-04

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： A61B6/03

CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/032 ,  A61B8/483 ,  G01N2223/3304 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： Methods and systems for reconstructing images of moving objects being spirally scanned with two dimensional detectors with a 3PI algorithm. The moving objects can be scanned at a rate of up to approximately three times slower than those of pre-existing systems. In a preferred embodiment, the invention allows for a patient on a table moving through a spiral scanner to be slowed down by a factor of up to three, and still use the same size detector array as those in existing spiral scanning systems.

摘要翻译： 用3PI算法用二维检测器进行螺旋扫描的移动物体重建图像的方法和系统。 可以以比现有系统的速度慢三倍的速度扫描移动物体。 在优选实施例中，本发明允许通过螺旋扫描器移动的桌子上的患者被减速多达三倍，并且仍然使用与现有螺旋扫描系统中相同尺寸的检测器阵列。

公开(公告)号：US07848479B1

公开(公告)日：2010-12-07

申请号：US12137137

申请日：2008-06-11

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： A61B6/00

CPC分类号： A61B6/466 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4233 ,  A61B6/4441 ,  A61B6/503 ,  A61B6/583 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421

摘要： Methods, apparatus and systems for an exact filtered back projection process for circle-plus trajectories, which consist of two components: C and L. The first component C, is analogous to a circle in the traditional circle-plus trajectories, is any closed (not necessarily planar) continuous curve. The second component L is almost any continuous curve. The only condition is that L starts below C and ends above C. The process does not depend on the global properties of L. When the source is located on L, one needs to know only how C projects onto the corresponding detector and the properties of L in the immediate neighborhood of the source position. The present invention is especially convenient for the traditional circle-plus trajectories, which are implemented using a gantry and moving table by obtaining a universal FBP algorithm, which is independent of table movement during the scan as long as the condition on L is satisfied.

摘要翻译： 用于圆加轨迹的精确滤波反投影过程的方法，装置和系统，其由两部分组成：C和L.第一分量C类似于传统圆加轨迹中的圆，是任何闭（ 不一定平面）连续曲线。 第二组分L几乎是任何连续的曲线。 唯一的条件是L开始低于C并在C结束。该过程不依赖于L的全局属性。当源位于L时，需要知道C如何投影到相应的检测器上， L在源头立场附近。 本发明对于通过获得通用FBP算法使用台架和移动台来实现的传统的圆圈轨迹特别方便，只要满足L上的条件，该FBP算法与扫描期间的台移动无关。

公开(公告)号：US07197105B2

公开(公告)日：2007-03-27

申请号：US10523867

申请日：2004-04-23

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： A61B6/03

CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/4441 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： Methods, systems and processes for providing efficient, accurate and exact image reconstruction using portable and easy to use C-arm scanning devices and rotating gantries, and the like. The invention can provide exact convolution-based filtered back projection (FBP) image reconstruction by combining a curved scan of the object and a line scan of the object. The curved scan can be done before or after the line scan. The curved scan can be less than or greater than a full circle about an object being scanned.

摘要翻译： 使用便携式和易于使用的C形臂扫描装置和旋转机架等来提供有效，精确和精确的图像重建的方法，系统和过程。 本发明可以通过组合对象的弯曲扫描和对象的线扫描来提供精确的基于卷积的滤波反投影（FBP）图像重建。 曲线扫描可以在线扫描之前或之后进行。 弯曲扫描可以小于或大于围绕被扫描对象的完整圆。

公开(公告)号：US20060034417A1

公开(公告)日：2006-02-16

申请号：US10523867

申请日：2004-04-23

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： H05G1/60 ,  A61B6/00

CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/4441 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： Methods, systems and processes for providing efficient, accurate and exact image reconstruction using portable and easy to use C-arm scanning devices and rotating gantries, and the like. The invention can provide exact convolution-based filtered back projection (FBP) image reconstruction by combining a curved scan of the object and a line scan of the object. The curved scan can be done before or after the line scan. The curved scan can be less than or greater than a full circle about an object being scanned.

摘要翻译： 使用便携式和易于使用的C形臂扫描装置和旋转机架等来提供有效，精确和精确的图像重建的方法，系统和过程。 本发明可以通过组合对象的弯曲扫描和对象的线扫描来提供精确的基于卷积的滤波反投影（FBP）图像重建。 曲线扫描可以在线扫描之前或之后进行。 弯曲扫描可以小于或大于围绕被扫描对象的完整圆。

公开(公告)号：US06898264B2

公开(公告)日：2005-05-24

申请号：US10858008

申请日：2004-06-01

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： A61B6/03 ,  G06T11/00

CPC分类号： A61B6/032 ,  A61B6/027 ,  G06T11/005 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： General scheme processes and systems for constructing algorithms for reconstructing images of objects that have been scanned in a spiral or non-spiral fashions with detectors. Application of the scheme requires finding of a weight function, which would lead to the required reconstruction algorithm. This general scheme can use a C-arm scan with the closed x-ray source trajectory and gives a new, theoretically exact and efficient (i.e., with the convolution-based FBP structure) reconstruction algorithm. The invention can also utilize the algorithms disclosed in an earlier application U.S. patent application Ser. No. 10/143,160 filed May 10, 2002, entitled: Exact Filtered Back Projection (FBP) Algorithm For Spiral Computer Tomography, which claims the benefit of U.S. Provisional Application No. 60/312,827 filed Aug. 16, 2001, also fit into the general scheme.

摘要翻译： 用于构建算法的一般方案过程和系统，用于重构已经以具有检测器的螺旋或非螺旋方式扫描的对象的图像。 该方案的应用需要找到权重函数，这将导致所需的重建算法。 该通用方案可以使用具有闭合的X射线源轨迹的C臂扫描，并给出新的理论上精确和有效的（即，基于卷积的FBP结构）重建算法。 本发明还可以利用早先申请的美国专利申请序列号 2002年5月10日提交的题为“用于螺旋计算机断层扫描的精确滤光反投影（FBP）算法”的美国临时申请No.10 / 143,160，其要求2001年8月16日提交的美国临时申请No.60 / 312,827的权益，也适用于 一般方案。

公开(公告)号：US07305061B2

公开(公告)日：2007-12-04

申请号：US11037968

申请日：2005-01-18

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： A61B6/03

CPC分类号： A61B8/483 ,  A61B6/027 ,  A61B6/032 ,  G01N2223/3304 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： Methods, systems and processes for providing efficient, accurate and exact image reconstruction using portable and easy to use C-arm scanning devices and rotating gantries, and the like, that combines both a circle and a curve scan. The invention can provide exact convolution-based filtered back projection (FBP) image reconstruction by combining two curved scans of the object. The curved scan can be less than or greater than a full circle about an object being scanned. The invention can be done by a first curve within a first plane followed by a second curve within a second plane that is transversal to the first plane.

摘要翻译： 使用结合了圆和曲线扫描的便携式和易于使用的C臂扫描装置和旋转台架等提供有效，精确和准确的图像重建的方法，系统和过程。 本发明可以通过组合对象的两个弯曲扫描来提供精确的基于卷积的滤波反投影（FBP）图像重建。 弯曲扫描可以小于或大于围绕被扫描对象的完整圆。 本发明可以通过在第一平面内的第一曲线进行，随后在第二平面内与第一平面横切的第二曲线来完成。

公开(公告)号：US07280632B2

公开(公告)日：2007-10-09

申请号：US11239605

申请日：2005-09-29

申请人： Alexander Katsevich

发明人： Alexander Katsevich

IPC分类号： A61B6/03

CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4441 ,  A61B6/4464 ,  A61B6/5205 ,  G01N2223/3304 ,  G01N2223/419 ,  G06T2211/416 ,  G06T2211/421 ,  Y10S378/901

摘要： Reconstructing images of objects spirally scanned with two-dimensional detectors with a novel algorithm under a variable pitch (nonconstant speed), where the object is not restricted to moving at a constant velocity. The object can move at variable speeds(increasing, decreasing, combinations thereof) during the scan of the object. The image reconstruction process is proven to create an exact image of the object under the ideal circumstances. The algorithm can have a convolution-based FBP (Filtered Back Projection) structure and works very efficiently. The algorithm uses less computer power and combines the benefits of Exact Algorithms and Approximate algorithms. An object can be moved at a nonconstant speed through a rotating source and oppositely located detector. Additionally, at least one source and oppositely located detector can be mounted on a coil stand for generating the spiral scan.

摘要翻译： 用可变间距（非恒定速度）的新颖算法用二维检测器螺旋扫描的物体重建图像，其中物体不限于以恒定速度移动。 在对象的扫描期间，物体可以以可变速度（增加，减小，组合）移动。 图像重建过程被证明可以在理想情况下创建物体的精确图像。 该算法可以具有基于卷积的FBP（滤波反投影）结构，并且非常有效地工作。 该算法使用较少的计算机能力，并结合了精确算法和近似算法的优点。 物体可以通过旋转源和相对位置的检测器以非恒定速度移动。 此外，至少一个源极和相对位置的检测器可以安装在线圈架上以产生螺旋扫描。