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1.发明授权Method and apparatus for reconstructing images from projection data acquired by a computed tomography system 失效用于从由计算机断层摄影系统获取的投影数据重建图像的方法和装置公开(公告)号：US06324243B1
公开(公告)日：2001-11-27
申请号：US09511678
申请日：2000-02-23
IPC分类号： A61B603
CPC分类号： A61B6/469 , A61B6/032 , Y10S378/901
摘要： A method and apparatus for use with a volumetric computed tomography (CT) scanning system. In accordance with the present invention, the volumetric CT scanning system utilizes an area detector to acquire projection data. The acquired projection data is stored in memory. The projection data corresponding to groups of pixels of the detector is then rebinned to thereby reduce the amount of projection data that will be utilized in performing an initial volumetric reconstruction of the image. The reconstructed image may then be processed to identify particular regions of interest, such as a pathology. If a particular region of interest is identified, all of the projection data corresponding to the region is then used to retrospectively reconstruct a high resolution image of the region of interest. The retrospectively reconstructed high resolution image can then be processed and analyzed to further evaluate the region of interest.
摘要翻译： 一种用于体积计算机断层摄影（CT）扫描系统的方法和装置。 根据本发明，体积CT扫描系统利用区域检测器来获取投影数据。 所获取的投影数据被存储在存储器中。 然后，对应于检测器的像素组的投影数据被重新组合，从而减少在执行图像的初始体积重建时将被使用的投影数据的量。 然后可以处理重建的图像以识别感兴趣的特定区域，例如病理学。 如果识别出特定的感兴趣区域，则所有与该区域相对应的投影数据然后用于追溯地重构感兴趣区域的高分辨率图像。 然后可以对回顾性重建的高分辨率图像进行处理和分析，以进一步评估感兴趣的区域。
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公开(公告)号：US06901131B2
公开(公告)日：2005-05-31
申请号：US10034133
申请日：2001-12-28
CPC分类号： A61B6/032
摘要： A method for arranging detector sections for an imaging system that has a field of view that is defined by a rotational axis and imaging geometry is provided. The method includes providing a plurality of detector sections, and arranging the detector sections in an asymmetric arrangement about a central axis of the field of view.
摘要翻译： 提供了一种用于布置具有由旋转轴和成像几何形状限定的视场的成像系统的检测器部分的方法。 该方法包括提供多个检测器部分，并且将检测器部分围绕视场的中心轴布置在不对称的布置中。
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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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4.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：US07333648B2
公开(公告)日：2008-02-19
申请号：US10862101
申请日：2004-06-04
CPC分类号： G06T7/0012 , A61B6/508 , A61B6/541 , G06T7/62 , G06T2207/10081 , G06T2207/30101
摘要： Techniques, hardware, and software are provided for quantification of extensional features of structures of an imaged subject from image data representing a two-dimensional or three-dimensional image. In one embodiment, stenosis in a blood vessel may be quantified from volumetric image data of the blood vessel. A profile from a selected family of profiles is fit to selected image data. An estimate of cross sectional area of the blood vessel is generated based on the fit profile. Area values may be generated along a longitudinal axis of the vessel, and a one-dimensional profile fit to the generated area values. An objective quantification of stenosis in the vessel may be obtained from the area profile. In some cases, volumetric image data representing the imaged structure may be reformatted to facilitate the quantification, when the structural feature varies along a curvilinear axis. A mask is generated for the structural feature to be quantified based on the volumetric image data. A curve representing the curvilinear axis is determined from the mask by center-finding computations, such as moment calculations, and curve fitting. Image data are generated for oblique cuts at corresponding selected orientations with respect to the curvilinear axis, based on the curve and the volumetric image data. The oblique cuts may be used for suitable further processing, such as image display or quantification.
摘要翻译： 提供了技术，硬件和软件，用于从表示二维或三维图像的图像数据中量化成像对象的结构的延伸特征。 在一个实施例中，可以从血管的体积图像数据量化血管中的狭窄。 所选择的配置文件系列的配置文件适合所选的图像数据。 基于拟合曲线产生血管横截面面积的估计。 面积值可以沿着容器的纵向轴线产生，并且一维轮廓拟合到所产生的面积值。 可以从区域剖面中获得容器中狭窄的客观量化。 在一些情况下，当结构特征沿着曲线轴线变化时，表示成像结构的体积图像数据可以重新格式化以便于定量。 基于体积图像数据生成要量化的结构特征的掩模。 表示曲线轴的曲线通过中心位置计算（如力矩计算）和曲线拟合从掩模确定。 基于曲线和体积图像数据，生成针对相对于曲线轴的相应选定取向的倾斜切割的图像数据。 倾斜切口可以用于适当的进一步处理，例如图像显示或定量。
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公开(公告)号：US06452164B1
公开(公告)日：2002-09-17
申请号：US09522573
申请日：2000-03-10
申请人： Emad Andarawis Andarawis , Paul Andrew Frank , Shankar Visranathan Guru , Ahmad Nadeem Ishaque , Douglas Ray Powell
发明人： Emad Andarawis Andarawis , Paul Andrew Frank , Shankar Visranathan Guru , Ahmad Nadeem Ishaque , Douglas Ray Powell
IPC分类号： G01T1208
CPC分类号： G01T1/208
摘要： An apparatus and method used to calibrate a gamma camera include an energy source and intensity selector and an energy weighting device. The energy source provides an energy output, such as an electrical current. The intensity selector is connected to the energy source and adjusts the energy output to a predetermined energy level that corresponds to an intensity of a predetermined radioactive source. The energy weighting device is also connected to the energy source and gamma camera, and the spatial compensator creates calibration signals from the energy output of the energy source. The calibration signals are supplied to the gamma camera and used during calibration of the gamma camera in lieu of energy signals produced by the gamma camera in response to a radioactive source.
摘要翻译： 用于校准γ照相机的装置和方法包括能量源和强度选择器以及能量加权装置。 能量源提供能量输出，例如电流。 强度选择器连接到能量源，并将能量输出调节到与预定放射源的强度对应的预定能量水平。 能量加权装置还连接到能量源和伽马相机，并且空间补偿器从能量源的能量输出创建校准信号。 校准信号被提供给伽马相机，并且在伽马相机的校准期间用于代替伽马相机响应于放射源产生的能量信号。
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公开(公告)号：US5670383A
公开(公告)日：1997-09-23
申请号：US440811
申请日：1995-05-15
申请人： Dante Edmond Piccone , Ahmad Nadeem Ishaque , Donald Earl Castleberry , Henri Max Rougeot , Peter Menditto
发明人： Dante Edmond Piccone , Ahmad Nadeem Ishaque , Donald Earl Castleberry , Henri Max Rougeot , Peter Menditto
IPC分类号： H01L27/146 , H01L31/107 , H01L31/18
CPC分类号： H01L27/14643 , H01L31/107 , Y10S438/965
摘要： A method of forming a planar semiconductor device, such as an array of APDs, includes the steps of doping a substantially planar block of n type semiconductor material with a p type dopant in accordance with a selected pattern to form a plurality of n type wells in the block surrounded by a foundation of p type semiconductor material. Each n type well is disposed so as to respectively adjoin a first surface of the block and such that a respective p-n junction is formed between the n type material in the well and the p type material foundation. The n type semiconductor material in each well has a substantially constant concentration of n type dopant throughout the n type material; the concentration of p type dopant in the foundation has a positive gradient extending from the p-n junction towards the second surface such that the peak surface electric field of the p-n junction in each well is less than the bulk electric field of the same p-n junction.
摘要翻译： 形成诸如APD阵列的平面半导体器件的方法包括以下步骤：根据所选择的图案，掺杂具有ap型掺杂剂的n型半导体材料的基本上平面的块，以在其中形成多个n型阱 由p型半导体材料的基础包围的块。 每个n型阱被设置成分别邻接块的第一表面，并且使得在井中的n型材料和p型材料基础之间形成相应的p-n结。 每个阱中的n型半导体材料在整个n型材料中具有基本恒定的n型掺杂剂的浓度; 基底中p型掺杂剂的浓度具有从p-n结朝向第二表面延伸的正梯度，使得每个阱中的p-n结的峰值表面电场小于相同p-n结的体电场。
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