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1. 发明授权

US5970111A Fast and efficient multiprocessor implementation for exact for an exact cone beam image reconstruction 失效
标题翻译：快速高效的多处理器实现，用于精确的锥形束图像重建
公开(公告)号：US5970111A
公开(公告)日：1999-10-19
申请号：US109266
申请日：1998-06-30
申请人： Supun Samarasekera , Frank Sauer , Kwok Tam , Ali R. Bani-Hashemi
发明人： Supun Samarasekera , Frank Sauer , Kwok Tam , Ali R. Bani-Hashemi
IPC分类号： A61B6/03 , G01N23/04 , G06T1/00
CPC分类号： G01N23/046 , A61B6/027 , G01N2223/419 , Y10S378/901
摘要： A computed tomographic imaging apparatus performs three-dimensional (3D) image reconstruction of a region of interest of an object using a plurality of processors for processing successive sets of cone beam measurement data that are acquired by scanning about the object with a cone beam radiation source and an area detector. A central memory has stored therein a plurality of subsets of pre-calculated image processing information, and the plurality of processors are responsive to a given sequence of successive ones of the subsets of pre-calculated image processing information for converting the cone beam measurement data to Radon derivative data on a plurality of Radon .phi.-planes. In a preferred embodiment each of the processors has a first input coupled for receiving in a broadcast manner the successive sets of cone beam measurement data, and a second input coupled for receiving the subsets of pre-calculated image processing information in a given sequence so that each one of the plurality of processors converts the cone beam measurement data broadcast to its second input into Radon derivative data for a respective subset of the Radon .phi.-planes.
摘要翻译：计算机断层成像装置使用多个处理器来执行对象的感兴趣区域的三维（3D）图像重构，以处理通过用锥束辐射源扫描关于物体的连续的锥束测量数据集合和区域检测器。中央存储器在其中存储有多个预先计算的图像处理信息的子集，并且多个处理器响应于预先计算的图像处理信息的子集中的连续的子集的给定序列，用于将锥形束测量数据转换为氡衍生数据在多个氡气平面上。在优选实施例中，每个处理器具有耦合的第一输入，用于以广播方式接收连续的锥形束测量数据集合，以及耦合用于以给定序列接收预先计算的图像处理信息的子集的第二输入，使得多个处理器中的每个处理器将锥形束测量数据广播转换成其第二输入，用于Radon扇形板的相应子集的Radon导数数据。

2. 发明授权

US6009142A Practical cone beam image reconstruction using local regions-of-interest 失效
标题翻译：使用本地感兴趣区域的实际锥形束图像重建
公开(公告)号：US6009142A
公开(公告)日：1999-12-28
申请号：US52415
申请日：1998-03-31
申请人： Frank Sauer , Supun Samarasekera , Kwok Tam
发明人： Frank Sauer , Supun Samarasekera , Kwok Tam
IPC分类号： A61B6/03 , G01N23/04 , G06T1/00 , G06T11/00
CPC分类号： A61B6/032 , G06T11/006 , A61B6/027 , G06T2211/421 , Y10S378/901
摘要： A method and apparatus of operating a CT imaging apparatus having a cone beam radiation source and a 2D detector arrangement, for exactly reconstructing an image of a 3D region of interest (ROI) in an object. Measurement data acquired by the 2D detector is processed to develop sub-sets of Radon data. Each of the sub-sets of Radon data is targeted for reconstructing a corresponding local 2D ROI in a 2D parallel projection of the object. Accordingly, after a sub-set of Radon data is completely developed, it is subjected to a first inversion processing step for developing the corresponding local 2D ROI. Multiple ones of the local ROIs are then grouped together and subjected to a second inversion processing step to develop an image reconstruction of a part of the 3D ROI in the object.
摘要翻译：一种用于操作具有锥形束辐射源和2D检测器装置的CT成像装置的方法和装置，用于精确地重建物体中的感兴趣的3D区域（ROI）的图像。处理由2D检测器获取的测量数据，以开发Radon数据子集。 Radon数据的每个子集的目标是在对象的2D平行投影中重构相应的局部2D ROI。因此，在Radon数据的子集完全展开之后，对第一反演处理步骤进行相应的局部2D ROI的开发。然后将多个本地ROIs分组在一起并进行第二反演处理步骤以开发对象中的3D ROI的一部分的图像重建。

3. 发明授权

US5901196A Reduction of hitlist size in spiral cone beam CT by use of local radon origins 失效
标题翻译：通过使用局部氡气起源减少螺旋锥束CT中的击打表大小
公开(公告)号：US5901196A
公开(公告)日：1999-05-04
申请号：US940489
申请日：1997-09-30
申请人： Frank Sauer , Supun Samarasekera , Kwok Tam
发明人： Frank Sauer , Supun Samarasekera , Kwok Tam
IPC分类号： A61B6/03 , G01N23/04 , G06T1/00
CPC分类号： G01N23/046 , A61B6/027 , G01N2223/419 , Y10S378/901
摘要： A method and apparatus for reconstructing an image of an object using a three dimensional (3D) computerized tomographic (CT) imager having a cone beam radiation source and detector arrangement for acquiring measurement data. The source and detector arrangement is operated at a plurality of source positions along a spiral scan path so as to acquire a corresponding plurality of sets of measurement data representative of radiation attenuation caused by the object. Image reconstruction processing information required for processing of the acquired measurement data in a Radon space partitioned by plurality of vertically oriented coaxial .phi.-planes for reconstructing the image, is pre-calculated and stored in a hitlist. The stored information is pre-calculated on less that all of the .phi.-planes, but due to a symmetry that is induced in the reconstruction processing, the stored information can be used for calculating Radon data for all of the .phi.-planes that partition the Radon space. The size of the hitlist is thus reduced by a factor equal to the number of .phi.-planes for which the stored information is re-used, e.g., 360 for 1/2 degree .phi.-plane spacing and storage of reconstruction processing information for a single .phi.-plane.
摘要翻译：一种使用具有用于获取测量数据的锥形束辐射源和检测器装置的三维（3D）计算机断层摄影（CT）成像器来重建物体的图像的方法和装置。源和检测器布置在沿着螺旋扫描路径的多个源位置处操作，以便获取表示由对象引起的辐射衰减的相应多组测量数据。在由用于重构图像的多个垂直取向的同轴电极划分的氡空间中处理所获取的测量数据所需的图像重建处理信息被预先计算并存储在命中列表中。所存储的信息预先计算得比所有的phi-plane少，但是由于在重构处理中引起的对称性，所存储的信息可以用于计算所有分区的phi-plane的Radon数据氡空间。因此，命中列表的大小被减少了等于重新使用所存储的信息的电路数量的因子，例如，对于+ E，360/1 + 2 + EE度phi平面间隔和单个飞机的重建处理信息。

4. 发明授权

US5960055A Fast cone beam image reconstruction using a detector weight list 失效
标题翻译：使用检测器重量列表的快速锥形束图像重建
公开(公告)号：US5960055A
公开(公告)日：1999-09-28
申请号：US994605
申请日：1997-12-19
申请人： Supun Samarasekera , Frank Sauer , Kwok Tam
发明人： Supun Samarasekera , Frank Sauer , Kwok Tam
IPC分类号： A61B6/03 , G01N23/04 , G06T11/00
CPC分类号： A61B6/032 , G01N23/046 , G06T11/005 , A61B6/027 , G01N2223/419 , Y10S378/901
摘要： A method and apparatus are provided for three dimensional computerized tomographic imaging of an object, wherein cone beam energy from a cone beam source is applied to at least a portion of an object to be imaged by causing relative rotational motion between the source and the object at a plurality of source positions along a path scanning trajectory. An area detector receives cone beam energy from the source on a plurality of detector elements arranged in an array of rows and columns, so that its detector elements develop a set of measurement signals at each of the plurality of source positions. Derivative Radon transform data is directly developing by multiplication of the measurement signals of each set by pre-calculated and stored weight factors. Thereafter, an image of the object is reconstructed using the directly developed Radon derivative data.
摘要翻译：提供了一种用于物体的三维计算机断层摄影成像的方法和装置，其中来自锥形束源的锥束能量通过在源和物体之间引起相对旋转运动而被施加到待成像对象的至少一部分沿着路径扫描轨迹的多个源位置。区域检测器从布置在行和列阵列中的多个检测器元件上接收来自源的锥束能量，使得其检测器元件在多个源位置的每一个处形成一组测量信号。衍生氡变换数据通过预先计算和存储的权重因子乘以每组的测量信号直接发展。此后，使用直接开发的Radon导数数据重建对象的图像。

5. 发明授权

US5901195A Two-step radon inversion processing for .phi.-planes having local radon origins 失效
标题翻译：具有局部氡起源的电极的两步骤氡反演处理
公开(公告)号：US5901195A
公开(公告)日：1999-05-04
申请号：US940324
申请日：1997-09-30
申请人： Frank Sauer , Supun Samarasekera , Kwok Tam
发明人： Frank Sauer , Supun Samarasekera , Kwok Tam
IPC分类号： G01N23/04 , A61B6/03 , G06F17/14 , G06T1/00 , G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/421 , Y10S378/901
摘要： A two-step 3D Radon inversion processor for processing Radon data on a set of vertically oriented co-axial .phi.-planes that partition Radon space, wherein each of the .phi.-planes is sampled during the processing so as to have its own independent local Radon origin. In accordance with further principles of the present invention, a 3D Radon data generator generates Radon data on a set of vertically oriented co-axial .phi.-planes that partition Radon space, wherein each of the .phi.-planes is sampled so as to have its own independent local Radon origin, and a two-step 3D Radon inversion processor independently processes each of the .phi.-planes. Any shift of the local Radon origins with respect to a global coordinate system is compensated for during the 3D Radon inversion processing. Compensation for the origin shift may be made during or after a first step of the Radon inversion processing.
摘要翻译：一种两步3D氡反演处理器，用于处理一组垂直定向的同轴电极上的Radon数据，分配Radon空间，其中每个phi-plane在处理期间被采样，以便拥有自己的独立的本地Radon 起源。根据本发明的进一步原理，3D氡数据发生器在分配氡空间的一组垂直取向的同轴电极上产生氡数据，其中每个电极被采样以具有其自己的独立的本地Radon起源，并且两步骤3D Radon倒置处理器独立地处理每个phi-plane。相对于全局坐标系的本地氡原点的任何偏移在3D氡反演处理期间被补偿。原点偏移的补偿可以在Radon反转处理的第一步骤期间或之后进行。

6. 发明授权

US5862198A Pre-calculated hitlist for reducing run-time processing of an exact cone beam reconstruction algorithm 失效
标题翻译：用于减少准确锥形束重建算法的运行时处理的预计算命中
公开(公告)号：US5862198A
公开(公告)日：1999-01-19
申请号：US940924
申请日：1997-09-30
申请人： Supun Samarasekera , Frank Sauer , Kwok Tam
发明人： Supun Samarasekera , Frank Sauer , Kwok Tam
IPC分类号： A61B6/03 , G06T1/00 , H04N7/18
CPC分类号： A61B6/032 , A61B6/027 , Y10S378/901
摘要： A method and apparatus for reconstructing an image of an object using a three dimensional (3D) computerized tomographic (CT) imager having a cone beam radiation source and detector arrangement for acquiring measurement data. Before the acquisition of measurement data during an imaging operation of the apparatus, image reconstruction processing information dependant on the geometric parameters of the imager and required for processing of the acquired measurement data for developing contributions to the final reconstruction of the image, is pre-calculated and stored. During an imaging operation of the apparatus, the acquired measurement data is processed using the pre-calculated image reconstruction processing information for reconstructing the image.
摘要翻译：一种使用具有用于获取测量数据的锥形束辐射源和检测器装置的三维（3D）计算机断层摄影（CT）成像器来重建物体的图像的方法和装置。在设备的成像操作期间获取测量数据之前，预先计算取决于成像器的几何参数的图像重建处理信息，并且用于处理所获取的测量数据以用于开发对图像的最终重建的贡献并存储。在设备的成像操作期间，使用用于重构图像的预先计算的图像重建处理信息来处理所获取的测量数据。

7. 发明授权

US6078638A Pixel grouping for filtering cone beam detector data during 3D image reconstruction 失效
标题翻译：用于在3D图像重建期间滤波锥形束检测器数据的像素分组
公开(公告)号：US6078638A
公开(公告)日：2000-06-20
申请号：US163494
申请日：1998-09-30
申请人： Frank Sauer , Kwok Tam , Bruce Ladendorf
发明人： Frank Sauer , Kwok Tam , Bruce Ladendorf
IPC分类号： H04N7/18 , A61B6/03 , G01N23/04 , G06T1/00 , G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , G01N23/046 , G01N2223/419 , G06T2211/421 , Y10S378/901
摘要： A method and apparatus for three dimensional (3D) computerized tomographic (CT) imaging of a region-of-interest (ROI) in an object, wherein image reconstruction processing is applied to a plurality of sets of pixels of 2D image data, each set being acquired on a pixelated 2D detector. The image reconstruction processing comprises filtering each of the acquired 2D image data sets for developing a corresponding plurality of filtered 2D images; and then 3D backprojecting the filtered 2D images into a common 3D space, thereby reconstructing in the 3D space a 3D image of the ROI in the object. In the present invention the filtering step comprises dividing the pixels of each set of the acquired 2D image data sets into first and second groups, and separately filtering the image data of each group to develop for each group it's own contribution to the corresponding filtered 2D image. In accordance with one embodiment of the invention, the first group essentially comprises those pixels that contribute to a given filtered 2D image in a space-invariant manner, and the second group essentially comprises those pixels that contribute to the given filtered 2D image in a space-variant manner. In accordance with another embodiment of the invention, the first group essentially comprises a contiguous portion of the pixels of each set that are entirely internal to the boundaries of a data combination mask that is applied to each set of the acquired 2D image data, and the second group essentially comprises at least one boundary region of contiguous pixels that are on or adjacent to a data combination mask boundary.
摘要翻译：一种用于对象中感兴趣区域（ROI）的三维（3D）计算机断层摄影（CT）成像的方法和装置，其中将图像重建处理应用于2D图像数据的多组像素组，每组被采集在像素化的2D检测器上。图像重建处理包括对所获取的2D图像数据集中的每一个进行滤波，以显影相应的多个经滤波的2D图像; 然后3D将经滤波的2D图像反投影到公共3D空间中，从而在3D空间中重建对象中的ROI的3D图像。在本发明中，过滤步骤包括将获取的2D图像数据集的每组的像素划分成第一组和第二组，并且分别对每组的图像数据进行滤波，以对每个组进行显影，它对相应的滤波2D图像有自己的贡献。根据本发明的一个实施例，第一组基本上包括以空间不变方式有助于给定的经滤波的2D图像的那些像素，并且第二组基本上包括在空间中有助于给定的滤波2D图像的那些像素不变的方式。根据本发明的另一个实施例，第一组基本上包括每个组的像素的连续部分，其全部内部在应用于所获取的2D图像数据的每组的数据组合掩码的边界内部，并且第二组基本上包括在数据组合掩码边界上或其附近的连续像素的至少一个边界区域。

8. 发明授权

US06763081B2 Cone beam computed tomography imaging system and method providing efficient utilization of detector area 失效
标题翻译：锥束计算机断层成像系统和方法提供了检测器区域的有效利用
公开(公告)号：US06763081B2
公开(公告)日：2004-07-13
申请号：US10262761
申请日：2002-10-02
申请人： Kwok Tam
发明人： Kwok Tam
IPC分类号： G21K112
CPC分类号： G06T11/005 , A61B6/027 , A61B6/032 , A61B6/4085 , G06T2211/432 , Y10S378/901
摘要： Improved image reconstruction methods for cone beam ROI (region of interest) imaging of long objects with an area detector using a two or more circular scans and a connecting line scan, wherein essentially the entire detector area is utilized for acquiring cone beam data for all source positions.
摘要翻译：使用两个或多个圆形扫描和连接线扫描的具有区域检测器的长对象的锥形束ROI（感兴趣区域）成像的改进的图像重建方法，其中基本上整个检测器区域用于获取所有源的锥形束数据职位

9. 发明授权

US06574297B2 System and method for image reconstruction in a cone beam imaging system 有权
标题翻译：锥束成像系统中图像重建的系统和方法
公开(公告)号：US06574297B2
公开(公告)日：2003-06-03
申请号：US10015716
申请日：2001-10-30
申请人： Kwok Tam
发明人： Kwok Tam
IPC分类号： A61B603
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/432 , Y10S378/901
摘要： A system and method for accurately reconstructing an image of a ROI (region of interest) within a long object by removing components associated with data contamination. In one aspect, an image reconstruction method comprises collecting a set of image data along a spiral scan path of a ROI (region of interest) portion of an object, identifying contaminated data within the collected set of image data, the contaminated data corresponding to image data associated with an object outside the ROI, and reconstructing an image of the ROI using the set of image data less the contaminated data.
摘要翻译：一种用于通过去除与数据污染相关的组件来精确重建长对象内的ROI（感兴趣区域）的图像的系统和方法。一方面，一种图像重建方法包括沿着对象的ROI（感兴趣区域）部分的螺旋扫描路径收集一组图像数据，识别所收集的图像数据集内的污染数据，对应于图像的污染数据与ROI之外的对象相关联的数据，以及使用所述一组图像数据来重构ROI的图像，而不是被污染的数据。

10. 发明授权

US06330298B1 Method and apparatus for simplifying the correction of image inaccuracies caused by processing of masked cone beam projection data 失效
标题翻译：用于简化由掩模锥形束投影数据的处理引起的图像不准确度校正的方法和装置
公开(公告)号：US06330298B1
公开(公告)日：2001-12-11
申请号：US09690629
申请日：2000-10-17
申请人： Kwok Tam
发明人： Kwok Tam
IPC分类号： A61B663
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/416 , Y10S378/901
摘要： A method and apparatus for three dimensional (3D) computerized tomographic (CT) imaging of an object, wherein image reconstruction processing is applied to a plurality of sets of 2D cone beam projection data, each set being acquired on a 2D detector at a corresponding plurality of scan path source positions. A first image reconstruction processing step comprises applying a mask to each set of the projection data so that data inside the boundaries of each mask form a corresponding plurality of masked 2D data sets. Next, the data inside each masked 2D data set is processed along line segments formed in the masked 2D data set, and having their endpoints determined by the mask boundaries, to develop a first 2D estimate of data determined from a given set of the 2D cone beam projection data. The next step comprises developing 2D correction data for each of the first 2D estimates of data by performing a one-dimensional (1D) convolving procession portions of the masked projection data to develop said 2D correction data. The final step comprises combining each of the first estimates of data and the 2D correction data calculated therefore, in a process which reconstructs an exact 3D image of the object.
摘要翻译：一种用于对象的三维（3D）计算机断层摄影（CT）成像的方法和装置，其中将图像重建处理应用于多组2D锥形束投影数据，每组在相应的多个2D检测器上获取的扫描路径源位置。第一图像重建处理步骤包括将掩模应用于每组投影数据，使得每个掩模的边界内的数据形成对应的多个被掩蔽的2D数据集。接下来，每个被掩蔽的2D数据集内的数据沿着形成在掩蔽的2D数据集中的线段进行处理，并且其端点由掩模边界确定，以形成从给定的2D锥组确定的数据的第一2D估计光束投影数据。下一步骤包括通过执行掩蔽的投影数据的一维（1D）卷积处理部分来开发所述2D校正数据来开发用于数据的第一2D估计中的每一个的2D校正数据。最后一步包括在重建物体的精确3D图像的过程中组合数据的第一估计和由此计算的2D校正数据中的每一个。

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