公开(公告)号：US06418183B1

公开(公告)日：2002-07-09

申请号：US09749821

申请日：2000-12-28

申请人： Stanley H. Fox ,  Jiang Hsieh

发明人： Stanley H. Fox ,  Jiang Hsieh

IPC分类号： A61B603

CPC分类号： A61B6/5235 ,  A61B6/032 ,  A61B6/488 ,  A61B6/5264 ,  G06F19/00 ,  Y10S378/901

摘要： One aspect of the present invention is a method for imaging a volume of a patient with a computed tomographic (CT) imaging system. The method includes steps of: scanning a volume of a patient with a first, full field of view (FOV) scan to acquire first projection data; scanning a smaller volume of the patient with a second, restricted FOV scan to acquire second projection data; estimating an amount of shift between the first projection data and the second projection data resulting from patient movement; and blending first projection data with second projection data in accordance with the estimated amount of shift to estimate projections of the second scan.

摘要翻译： 本发明的一个方面是用计算机断层摄影（CT）成像系统对患者体积进行成像的方法。 该方法包括以下步骤：用第一全视野（FOV）扫描扫描患者体积以获取第一投影数据; 用第二限制FOV扫描扫描较小体积的患者以获得第二投影数据; 估计由患者移动导致的第一投影数据和第二投影数据之间的偏移量; 以及根据所估计的偏移量将第一投影数据与第二投影数据进行混合以估计第二扫描的投影。

公开(公告)号：US06411673B1

公开(公告)日：2002-06-25

申请号：US09751814

申请日：2000-12-29

申请人： Neil B. Bromberg ,  Clarence L. Gordon, III

发明人： Neil B. Bromberg ,  Clarence L. Gordon, III

IPC分类号： A61B603

CPC分类号： A61B6/583 ,  A61B6/032 ,  Y10S378/901

摘要： Time consuming calibration of a multi-element x-ray detector for an x-ray computed tomography machine that has multi-sample rate capabilities is reduced by determining through the use of air-scans, a scalar relationship between sensitivity of detector elements as a function of sampling rate. This scalar relationship is in vector form and may be applied to independently obtain calibration vectors at a base scan rate to provide effective calibration vectors at a variety of scan rates without the need for time consuming daily calibration scans at each of those sample rates.

摘要翻译： 通过使用空气扫描来确定具有多采样率能力的x射线计算机断层摄影机的多元X射线检测器的耗时校准，可以将检测器元件的灵敏度之间的标量关系作为函数 的采样率。 该标量关系是向量形式，并且可以应用于以基本扫描速率独立地获得校准向量，以便以各种扫描速率提供有效的校准向量，而不需要在每个采样速率下进行耗时的每日校准扫描。

公开(公告)号：US06381296B1

公开(公告)日：2002-04-30

申请号：US09714964

申请日：2000-11-20

申请人： Masahide Nishiura

发明人： Masahide Nishiura

IPC分类号： A61B603

CPC分类号： G06T19/00 ,  G06T2219/008 ,  G06T2219/028 ,  Y10S378/901

摘要： An apparatus processes a medical image. A three-dimensional data acquisition unit acquires three-dimensional data of a plurality of objects for diagnosis of a living body. A three-dimensional data memory stores the three-dimensional data of each of the plurality of objects for diagnosis. A sectional position memory stores a plurality of sectional positions for each of the plurality of objects for diagnosis. A selector selects one of the plurality of objects for diagnosis. An image generation unit generates a plurality of sectional images using the three-dimensional data corresponding to the one of the plurality of objects for diagnosis. Each image is along a different sectional position in the one of the plurality of objects for diagnosis.

摘要翻译： 一种装置处理医学图像。 三维数据获取单元获取用于诊断生物体的多个物体的三维数据。 三维数据存储器存储用于诊断的多个对象中的每一个的三维数据。 截面位置存储器存储用于多个对象中的每一个用于诊断的多个截面位置。 选择器选择多个对象中的一个用于诊断。 图像生成单元使用与多个对象中的一个对应的三维数据生成多个截面图像进行诊断。 每个图像沿着用于诊断的多个物体中的一个中的不同截面位置。

公开(公告)号：US06343109B2

公开(公告)日：2002-01-29

申请号：US09772139

申请日：2001-01-29

申请人： Clemens Doubrava ,  Guenter Hahn

发明人： Clemens Doubrava ,  Guenter Hahn

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/027 ,  G01N23/046 ,  G01N2223/419 ,  G06T15/005 ,  Y10S378/901

摘要： A CT (computed tomography) apparatus has a detector system which produces an x-ray beam that rotates around a system axis, and which produces data representing attenuation of the x-rays by an examination subject, and a data transmission path for the transmission of data from the detector system to an image reconstruction computer that is stationary relative to the detector system. Data required for a live image are extracted from the data supplied by the detector system during the scanning of a subject under examination, and are transmitted during the scanning to the image reconstruction computer via the data transmission path and after completion of the scanning, all data supplied by the detector system during the scanning are transmitted to the image reconstruction computer.

摘要翻译： CT（计算机断层摄影）装置具有检测器系统，其产生围绕系统轴线旋转的X射线束，并且产生表示检查对象的X射线衰减的数据，以及用于传输 从检测器系统到相对于检测器系统静止的图像重建计算机的数据。 在被检查对象的扫描期间，从检测器系统提供的数据中提取实时图像所需的数据，并且在扫描期间经由数据传输路径发送到图像重建计算机，并且在完成扫描之后，所有数据 在扫描期间由检测器系统提供的图像被发送到图像重建计算机。

公开(公告)号：US06325539B1

公开(公告)日：2001-12-04

申请号：US09356535

申请日：1999-07-19

申请人： Neil B. Bromberg ,  Tin-Su Pan

发明人： Neil B. Bromberg ,  Tin-Su Pan

IPC分类号： A61B603

CPC分类号： A61B6/583

摘要： Methods and apparatus for calibration simplification in a computed tomography (CT) system are described. In one embodiment, the CT system utilizes calibration values from a first scan type, or mode of operation, to determine calibration values for at least a second scan type. As a result, the time required to perform calibration of the CT system is reduced.

摘要翻译： 描述了计算机断层摄影（CT）系统中用于校准简化的方法和装置。 在一个实施例中，CT系统利用来自第一扫描类型或操作模式的校准值来确定至少第二扫描类型的校准值。 结果，降低了对CT系统进行校准所需的时间。

公开(公告)号：US06324244B1

公开(公告)日：2001-11-27

申请号：US09668910

申请日：2000-09-25

申请人： Josef Lauter ,  Stefan Schneider ,  Herfried Karl Wieczorek

发明人： Josef Lauter ,  Stefan Schneider ,  Herfried Karl Wieczorek

IPC分类号： A61B603

CPC分类号： H03M1/186 ,  Y10S378/901

摘要： The invention relates to a computed tomography apparatus which includes a radiation source, a detector device and an analog-to-digital converter for converting the detector output signals into digital values. In order to realize a computed tomography apparatus in which the number of binary positions required for the encoding of the signal entering the analog-to-digital converter is reduced while using simple components which operate with a high degree of reliability, use is made of a read-out amplifier (1) which precedes the analog-to-digital converter (10), has a plurality of gain factors and a control system (12) for the relevant gain factor which, when a predetermined limit value of the integrated input signal is reached, automatically selects an appropriate, each time lower gain factor for the step-wise linear approximation of a proportional ratio between the digital values and the square root of the detector output signals.

摘要翻译： 本发明涉及一种计算机断层摄影装置，其包括辐射源，检测器装置和用于将检测器输出信号转换成数字值的模拟 - 数字转换器。 为了实现计算机断层摄影装置，其中使用以高可靠性操作的简单组件来减少进入模数转换器的信号的编码所需的二进制位置的数量，使用 在模拟 - 数字转换器（10）之前的读出放大器（1）具有多个增益因子和用于相关增益因子的控制系统（12），当所述积分输入信号的预定极限值 自动选择适当的每次较低的增益因子，用于数字值与检测器输出信号的平方根之间的比例比的逐级线性近似。

公开(公告)号：US06324243B1

公开(公告)日：2001-11-27

申请号：US09511678

申请日：2000-02-23

申请人： Peter Michael Edic ,  Ahmad Nadeem Ishaque ,  Mehmet Yavuz

发明人： Peter Michael Edic ,  Ahmad Nadeem Ishaque ,  Mehmet Yavuz

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。

公开(公告)号：US06324241B1

公开(公告)日：2001-11-27

申请号：US09475386

申请日：1999-12-30

申请人： Guy M. Besson

发明人： Guy M. Besson

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  A61B6/027 ,  Y10S378/901

摘要： In one embodiment, the present invention is a method for reconstructing a scanned CT image that includes steps of: acquiring projection data of an object utilizing a flat-panel detector; and filtering and backprojecting the projection data, without radially interpolating, to reconstruct a three-dimensional image of the object. This embodiment provides direct fan-parallel, three-dimensional reconstruction of computed tomographic images without loss of resolution associated with radial interpolation, while retaining imaging quality and backprojection speed gains associated with parallel reconstruction.

摘要翻译： 在一个实施例中，本发明是一种用于重建扫描的CT图像的方法，包括以下步骤：利用平板检测器获取对象的投影数据; 并且在不进行径向内插的情况下过滤和反投影投影数据，以重建对象的三维图像。 该实施例提供计算机断层图像的直接风扇平行三维重建，而不损失与径向插值相关联的分辨率，同时保持与并行重建相关联的成像质量和反投影速度增益。

公开(公告)号：US06307908B1

公开(公告)日：2001-10-23

申请号：US09400697

申请日：1999-09-20

申请人： Hui Hu

发明人： Hui Hu

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  Y10S378/901

摘要： The present invention comprises a system and method for producing images of an object utilizing an x-ray computed tomography (CT) system. Detector elements within the CT system provide raw projection data representing the attenuated x-rays. A data corrector modifies the raw projection data to account for errors to produce corrected projection data. A high order interpolator operates on the corrected projection data to provide estimated projection data at the exact spatial position of the desired image. The high order interpolator utilizes a cubic spline function to determine the estimated projection data. The estimated projection data are used by an image reconstructor to perform high speed image reconstruction.

摘要翻译： 本发明包括利用X射线计算机断层摄影（CT）系统产生物体的图像的系统和方法。 CT系统内的检测器元件提供表示衰减的X射线的原始投影数据。 数据校正器修改原始投影数据以解决错误以产生校正的投影数据。 高阶内插器对校正的投影数据进行操作，以在期望图像的确切空间位置处提供估计的投影数据。 高阶内插器利用三次样条函数来确定估计的投影数据。 估计的投影数据由图像重构器用于执行高速图像重建。

公开(公告)号：US06295331B1

公开(公告)日：2001-09-25

申请号：US09351757

申请日：1999-07-12

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B603

CPC分类号： G06T11/005

摘要： A method and apparatus for image reconstruction in an imaging system having an x-ray source, an x-ray detector module having a plurality of detector channels, a data acquisition system coupled to the detector module, and a scanning axis z, in which a scan of an object is performed to obtain data, and a smoothing filter is applied to the data, wherein the smoothing applied to the data varies as a function of position. To compensate for increased noise near the edge of a field of view, for example, a z-smoothing filter applies an increased amount of smoothing to the data as a distance from an isochannel increases. A channel dependent primary speed/afterglow correction can also be used to provide smoothing.

摘要翻译： 一种用于具有x射线源，具有多个检测器通道的X射线检测器模块，耦合到检测器模块的数据采集系统和扫描轴z的成像系统中的图像重建的方法和装置，其中， 执行对象的扫描以获得数据，并且对数据应用平滑滤波器，其中应用于数据的平滑随着位置的变化而变化。 为了补偿视场边缘附近增加的噪声，例如，z平滑滤波器随着距离等信道的距离增加，对数据应用增加的平滑量。 还可以使用通道相关的主速度/余辉校正来提供平滑。