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71.发明申请Acquisition and reconstruction of projection data using a stationary CT geometry 有权使用固定CT几何获取和重建投影数据公开(公告)号：US20080056437A1
公开(公告)日：2008-03-06
申请号：US11725892
申请日：2007-03-20
IPC分类号： G01N23/00
CPC分类号： G01T1/2985 , A61B6/027
摘要： Systems and methods are provided for acquiring and reconstructing projection data using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a non-sequential activation of X-ray source locations on an annular source is employed to acquire projection data. In another embodiment, a distributed source is tilted relative to an axis of the scanner to acquire the projection data. In a further embodiment, a plurality of X-ray source locations on an annular source are activated such that the aggregated signals correspond to two or more sets of spatially interleaved helical scan data.
摘要翻译： 提供了使用具有固定分布式X射线源和检测器阵列的计算机断层摄影（CT）系统来获取和重建投影数据的系统和方法。 在一个实施例中，使用在环形源上的X射线源位置的非顺序激活来获取投影数据。 在另一个实施例中，分布式源相对于扫描器的轴线倾斜以获取投影数据。 在另一实施例中，环形源上的多个X射线源位置被激活，使得聚集的信号对应于两组或多组空间交错的螺旋扫描数据。
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72.发明申请Acquisition and reconstruction of projection data using a stationary CT geometry 有权使用固定CT几何获取和重建投影数据公开(公告)号：US20080056435A1
公开(公告)日：2008-03-06
申请号：US11726023
申请日：2007-03-20
申请人： Samit Kumar Basu , Bruno De Man , Jed Douglas Pack , Xiaoye Wu , Zhye Yin , Peter Michael Edic
发明人： Samit Kumar Basu , Bruno De Man , Jed Douglas Pack , Xiaoye Wu , Zhye Yin , Peter Michael Edic
IPC分类号： G01N23/00
CPC分类号： G01T1/2985 , A61B6/027
摘要： Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a distributed source is provided as arcuate segments offset in the X-Y plane and along the Z-axis.
摘要翻译： 提供了系统和方法，用于使用具有固定分布式X射线源和检测器阵列的计算机断层摄影（CT）系统来获取和重建数学上完整或足够的投影数据。 在一个实施例中，分布式源被提供为在X-Y平面和Z轴上偏移的弧形段。
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公开(公告)号：US07221728B2
公开(公告)日：2007-05-22
申请号：US10625361
申请日：2003-07-23
申请人： Peter Michael Edic , Maria Iatrou , Erdogan Cesmeli , Bruno De Man , Samit Basu
发明人： Peter Michael Edic , Maria Iatrou , Erdogan Cesmeli , Bruno De Man , Samit Basu
IPC分类号： G01N23/04
CPC分类号： A61B6/541 , A61B6/032 , A61B6/4035 , A61B6/405 , A61B6/4241 , A61B6/482 , A61B6/503 , A61B6/563 , G01N23/046 , G01N2223/419 , G01N2223/612 , G06T5/003 , G06T5/50 , G06T7/246 , G06T11/005 , G06T2207/10081 , G06T2207/30004 , G06T2211/408 , G06T2211/412 , Y10S378/901
摘要： One or more techniques are provided for adapting a reconstruction process to account for the motion of an imaged object or organ, such as the heart. In particular, projection data of the moving object or organ is acquired using a slowly rotating CT gantry. Motion data may be determined from the projection data or from images reconstructed from the projection data. The motion data may be used to reconstruct motion-corrected images from the projection data. The motion-corrected images may be associated to form motion-corrected volume renderings.
摘要翻译： 提供一种或多种技术用于调整重建过程以解决成像对象或器官（例如心脏）的运动。 特别地，使用缓慢旋转的CT台架来获取移动物体或器官的投影数据。 可以从投影数据或从投影数据重建的图像确定运动数据。 运动数据可用于从投影数据重建运动校正图像。 可以将运动校正的图像相关联以形成运动校正的体积渲染。
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公开(公告)号：US07082180B2
公开(公告)日：2006-07-25
申请号：US10724461
申请日：2003-11-26
IPC分类号： A61B6/00
CPC分类号： A61B6/507 , A61B6/032 , A61B6/481 , A61B6/488 , A61B6/5217 , Y10S378/901
摘要： A method for computing volumetric perfusion in a spatially stationary organ using a computed tomography (CT) imaging system includes positioning an area detector such that the area detector encompasses a spatially stationary organ within the field of view of the imaging system for all view angles, operating the CT imaging system in a cine mode to acquire a plurality of projection data representative of the tissue dynamics in the spatially stationary organ, processing the projection data, temporally filtering respective signals from volume elements of the reconstructions of the projection data which are representative of the tissue dynamics and computing the volumetric perfusion in the organ using the temporally filtered signals from volume elements.
摘要翻译： 使用计算机断层摄影（CT）成像系统计算空间静止器官中的体积灌注的方法包括定位区域检测器，使得区域检测器在成像系统的视野范围内包含用于所有视角的空间静止器官，操作 CT成像系统以电影模式获取表示空间静止器官中的组织动力学的多个投影数据，处理投影数据，对代表投影数据的投影数据的重建的体积元素的各个信号进行时间滤波 组织动力学和使用来自体积元素的时间滤波信号计算器官中的体积灌注。
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公开(公告)号：US07054475B2
公开(公告)日：2006-05-30
申请号：US10033952
申请日：2001-12-28
申请人： Peter Michael Edic , Maria Iatrou
发明人： Peter Michael Edic , Maria Iatrou
IPC分类号： G06K9/00
CPC分类号： G06T11/005 , G06T2211/412
摘要： A method for volumetric reconstruction of a cyclically moving object using a computed tomography (CT) system includes scanning a cyclically moving object with a CT imaging system including at least one of an area detector and a linear detector to encompass the desired field of view and a rotating gantry to measure projection data during a plurality of cycles of the cyclically moving object. The method also includes dividing a period of the cyclically moving object into a discrete number of phases, identifying an initial set of projection data at a desired phase of a first cycle at a first angle, identifying at least one subsequent set of projection data at the same desired phase of a subsequent cycle at an angle that is different from the first angle, and combining the initial set of projection data with each subsequent set of identified projection data and using a reconstruction algorithm to generate a three-dimensional image. The method further includes repeating the steps of identifying an initial set of projection data at a desired phase of a first cycle at a first angle, identifying at least one subsequent set of projection data at the same desired phase of a subsequent cycle at an angle that is different from the first angle, and combining the initial set of projection data with each subsequent set of identified projection data and using a reconstruction algorithm to generate a collection of three-dimensional images for the desired phases; and temporally filtering the collection of three-dimensional images on a pixel by pixel basis.
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公开(公告)号：US06956926B2
公开(公告)日：2005-10-18
申请号：US10335826
申请日：2002-12-31
CPC分类号： G06T11/005 , G06T2211/412
摘要： A technique is provided for improving consistency between slabs in a reconstructed CT image. Candidate sectors associated with an image slab are determined. If the sectors contain sufficient information to reconstruct the image slab, the sector which minimizes inconsistency with projection data for adjacent image slabs is selected for reconstruction. If the sectors do not contain sufficient information to reconstruct the slab, sectors are merged together until a merge group contains sufficient information. The merge group which minimizes inconsistency with projection data for adjacent image slabs is selected for image reconstruction. The selected sectors or merge groups are then reconstructed with the resulting image slabs comprising a reconstructed image with improved consistency between image slabs.
摘要翻译： 提供了一种用于改善重建CT图像中的平板之间的一致性的技术。 确定与图像板相关联的候选扇区。 如果扇区含有足够的信息来重建图像板，则选择最小化与相邻图像板的投影数据不一致的扇区用于重建。 如果扇区不包含足够的信息来重建slab，则扇区合并在一起，直到合并组包含足够的信息。 选择最小化与相邻图像板的投影数据不一致的合并组用于图像重建。 然后使用包括具有改进的图像板之间的一致性的重建图像的所得到的图像板来重建所选择的扇区或合并组。
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公开(公告)号：US06879715B2
公开(公告)日：2005-04-12
申请号：US09683255
申请日：2001-12-05
CPC分类号： G06T5/003 , G06T2207/10081
摘要： An apparatus and a method of processing a collection of uncorrected radiographs are described with the apparatus comprising an X-ray scatter compensator and a controller. The compensator is configured for iteratively generating a refined value of a normalized estimated X-ray scatter signal corresponding to an uncorrected radiograph of said collection of uncorrected radiographs. The controller is configured to be coupled to the compensator and further configured to subtract said refined value of said normalized estimated X-ray scatter signal from a corresponding normalized total X-ray signal of a respective one of said uncorrected radiographs so as to form a corresponding corrected radiograph.
摘要翻译： 使用包括X射线散射补偿器和控制器的装置描述处理未校正射线照片的集合的装置和方法。 补偿器被配置为迭代地产生对应于所述未校正射线照片集合的未校正的X射线照片的归一化估计X射线散射信号的精细值。 所述控制器被配置为耦合到所述补偿器，并且还被配置为从所述未校正的X射线照片中的相应一个的对应的归一化总X射线信号中减去所述归一化估计的X射线散射信号的所述精细值，以便形成相应的 校正射线照相。
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公开(公告)号：US06793496B2
公开(公告)日：2004-09-21
申请号：US10085726
申请日：2002-02-28
IPC分类号： G09B2328
CPC分类号： G09B23/28 , G06F19/00 , G06T11/006 , G06T13/20 , G06T19/20 , G06T2210/41 , G06T2211/412 , G06T2219/2016 , G06T2219/2021
摘要： The present invention provides a model and a method and apparatus for utilizing the model to simulate an imaging scenario. The model is mathematically defined by analytical basis objects and/or polygonal basis objects. Preferably, the model is a model of the human heart and thorax. Polygonal basis objects are only used to define structures in the model that experience torsion, such as certain structures in the heart that experience torsion during the cardiac cycle. The manner in which the basis objects comprising the model are transformed by scaling, translation and rotation is defined for each basis object. In the case where a basis object experiences torsion, the rotation of the basis object will change as a function of the length along the axis of the basis object about which rotation is occurring. During an imaging system simulation, the model is utilized by a forward projection routine, which integrates the linear attenuation coefficients associated with the rays emitted by a simulated x-ray source and collected by a simulated detector array to obtain line integrals corresponding to forward projection data. The forward projection data is then processed to take into account the physics of the imaging technology, the x-ray source and the detector array. The processed projection data is then processed and back-projected by a reconstruction modeling routine to produce a reconstructed representation of the model of the heart as a function of time.
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79.发明授权Apparatus, methods, and computer programs for estimating and correcting scatter in digital radiographic and tomographic imaging 失效用于估计和校正数字放射照相和断层成像中的散射的装置，方法和计算机程序公开(公告)号：US06408049B1
公开(公告)日：2002-06-18
申请号：US09585786
申请日：2000-06-05
IPC分类号： H05G164
CPC分类号： G01T1/1648
摘要： An x-ray imaging system images an object by transmitting primary signals and includes a collimator placed between detectors of the x-ray imaging system. The collimator reduces respective scatter components of total signals including a primary signal component and a scatter signal component. One of the detectors detects the total signals, the collimator collimates the primary signals of the total signals focally aligned with the collimator and traveling through the one of the detectors, another of the detectors detects the collimated, primary signals. The x-ray imaging system reduces the scatter components of the total signals detected by the one of the detectors based on the detected, collimated signals and the corresponding, detected, total signals. In another aspect, a detector includes regions of reduced absorption.
摘要翻译： X射线成像系统通过发送主信号对物体进行成像，并且包括放置在x射线成像系统的检测器之间的准直器。 准直器减少总信号的各个散射分量，包括主信号分量和散射信号分量。 其中一个检测器检测总信号，准直器准直了与准直器对准的总信号的主信号，并且穿过检测器中的一个检测器，另一个检测器检测准直的主信号。 X射线成像系统基于检测到的准直信号和相应的检测到的总信号，减少由检测器中的一个检测的总信号的散射分量。 在另一方面，检测器包括吸收减小的区域。
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公开(公告)号：US06175615B1
公开(公告)日：2001-01-16
申请号：US09289819
申请日：1999-04-12
IPC分类号： G21K102
摘要： A collimator 100 for use in a radiation imaging system 10, and a method for making such collimators, are provided, wherein the collimator 100 is capable of collimating radiation in two orthogonal planes. The collimator in one embodiment includes a block 101 of radiation absorbing material having a plurality of focally aligned channels 102 extending therethrough; in a second embodiment, the collimator includes first and second collimation204, 212 sections having a respective first plurality of focally aligned plate sets 201 and a respective second plurality of focally aligned plate sets 203 disposed orthogonally to the first plurality of plate sets. The method for making the collimator includes generating a CAD drawing, generating from the CAD drawing one or more stereo-lithographic files, and using the stereo-lithographic files to control an electro-deposition machining machine which creates the channels in the block.
摘要翻译： 提供了一种用于辐射成像系统10的准直器100及其制造方法，其中准直仪100能够在两个正交平面中准直辐射。 在一个实施例中的准直器包括辐射吸收材料的块101，其具有延伸穿过其中的多个焦点对准的通道102; 在第二实施例中，准直器包括第一和第二准直204,212个部分，其具有相应的第一多个焦点对准的板组201和与第一组多个板组正交设置的相应的第二多个焦点对准的板组203。 制造准直器的方法包括生成CAD绘图，从CAD绘制一个或多个立体光刻文件，并使用立体光刻文件来控制在块中产生通道的电沉积加工机。
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