公开(公告)号：US06173029B2

公开(公告)日：2001-01-09

申请号：US09139992

申请日：1998-08-25

申请人： Min Xie ,  Guy M. Besson ,  Neil B. Bromberg

发明人： Min Xie ,  Guy M. Besson ,  Neil B. Bromberg

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  Y10S378/901

摘要： The present invention comprises a system and method for correcting for z-slope variations in detector cell outputs represented by data obtained by a scan in a CT system. According to one aspect of the invention, a final error factor, based upon a combination of a correction factor and an initial error factor, is applied to the data. The correction factor having a computational complexity independent of the order of correction desired. The present invention transfers all of the computational complexity of z-slope correction to a calibration process, thereby improving the computational speed and efficiency of producing an accurate image based on the scan data. In another aspect, the present invention improves image quality by providing a correction factor comprising a plurality of channel correction factors, where each of the plurality of channels is the center channel for a corresponding moving segment used to respectively determine each of the channel correction factors.

摘要翻译： 本发明包括用于校正由CT系统中的扫描获得的数据表示的检测器单元输出中的z斜率变化的系统和方法。 根据本发明的一个方面，将基于校正因子和初始误差因子的组合的最终误差因子应用于数据。 校正因子具有独立于期望校正次序的计算复杂度。 本发明将z斜率校正的所有计算复杂度传送到校准过程，从而基于扫描数据提高计算速度和产生精确图像的效率。 在另一方面，本发明通过提供包括多个通道校正因子的校正因子来提高图像质量，其中多个通道中的每个通道是用于分别确定每个通道校正因子的相应运动段的中心通道。

公开(公告)号：US09895125B2

公开(公告)日：2018-02-20

申请号：US14946626

申请日：2015-11-19

申请人： Guy M. Besson

发明人： Guy M. Besson

IPC分类号： A61B6/00 ,  A61B6/03

CPC分类号： A61B6/5205 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/4435 ,  A61B6/54

摘要： A computed tomography scanner has multiple radiation sources or source arrays, in specific geometric dimensions for optimized imaging speed. A CT system with maximum fan-angle Γ and K simultaneously active x-ray sources distributed over an angle of π−2Γ radians, the sources partially overlapping on a detector array, measures summed projection data corresponding to K or less line-integrals at each detector element. When the CT machine's dimensions RM, Rd, and RS, corresponding respectively to the measurement field-of-view, detector distance from iso-center, and source distance from iso-center, are such that projections of the two extreme radiation sources do not overlap on the detector, the individual line-integrals can be recovered by inversion of linear systems comprising K or less rows in fewer unknown than rows; the unknowns given by the exponential of the negative of the line integrals to be recovered. The CT scanner then reconstructs an image from the line-integral estimates.

公开(公告)号：US20160310086A1

公开(公告)日：2016-10-27

申请号：US15200435

申请日：2016-07-01

申请人： Guy M. Besson

发明人： Guy M. Besson

IPC分类号： A61B6/03 ,  A61B6/00

CPC分类号： A61B6/035 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/4452 ,  A61B6/5205 ,  A61B6/54

摘要： A multiple-source CT system has an annular vacuum chamber surrounding a passage wherein lies an object. A target is in the chamber, the passage passing through an opening of the target. Multiple electron beam emitters are on an emitter gantry within the chamber, each emitting an electron beam towards the target to cause x-rays. An x-ray detector array is mounted on a detector gantry and feeds an image processing system configured to generate tomographic images of the object from detector data. In embodiments, multiple electron beam emitters energize simultaneously. In embodiments, target and emitter gantry counter-rotate. The method includes rotating electron-beam emitters with respect to the target to generate x-rays from the target while rotating a detector about a passage and acquiring data from the detector while multiple detector elements receive x-rays stimulated by multiple emitters, forming a sinogram, and processing the sinogram into a tomographic image of the object.

摘要翻译： 多源CT系统具有围绕通道的环形真空室，其中放置有物体。 目标是在房间内，通过目标的开口的通道。 多个电子束发射器位于腔室内的发射器门架上，每个发射电子束朝向目标物引起X射线。 X射线检测器阵列安装在检测器台架上，并且馈送图像处理系统，该图像处理系统配置成从检测器数据生成物体的断层图像。 在实施例中，多个电子束发射器同时通电。 在实施例中，目标和发射台架反转。 该方法包括相对于目标旋转电子束发射器，以在从多个探测器元件接收由多个发射器刺激的x射线的同时，多个探测器元件接收由多个发射器刺激的X射线，同时围绕通道旋转检测器并从检测器获取数据，从而从目标产生x射线，形成正弦图 并将正弦图处理成对象的断层图像。

公开(公告)号：US20150256764A1

公开(公告)日：2015-09-10

申请号：US14639322

申请日：2015-03-05

申请人： Guy M. Besson

发明人： Guy M. Besson

IPC分类号： H04N5/262 ,  H04N13/02 ,  H04N7/18

CPC分类号： H04N5/2628 ,  H04N5/2258 ,  H04N5/23232 ,  H04N5/265 ,  H04N7/183

摘要： An active-tracking based system for generating a mirror image includes a position sensing module for determining the position of an observer relative to a surface, and a camera module for generating the mirror image based upon the position determined by the position sensing module, as the mirror image would have been experienced by the observer if the surface had been a mirror. An active-tracking based method for generating a mirror image includes (a) determining the position of an observer relative to a surface, (b) capturing at least one image, and (c) generating, from the at least one image, the mirror image as the mirror image would have been experienced by the observer if the surface had been a mirror.

摘要翻译： 用于产生镜像的基于主动跟踪的系统包括用于确定观察者相对于表面的位置的位置感测模块，以及用于基于由位置感测模块确定的位置生成镜像的照相机模块，作为 如果表面是镜子，观察者将会遇到镜像。 用于产生镜像的基于主动跟踪的方法包括（a）确定观察者相对于表面的位置，（b）捕获至少一个图像，以及（c）从所述至少一个图像生成所述镜子 如果表面是镜子，观察者将会经历像镜像的图像。

公开(公告)号：US07092482B2

公开(公告)日：2006-08-15

申请号：US10412736

申请日：2003-04-11

申请人： Guy M. Besson

发明人： Guy M. Besson

IPC分类号： A61B6/00

CPC分类号： A61B6/0414 ,  A61B6/4291 ,  A61B6/502 ,  A61B6/544

摘要： Scatter effects are reduced in a radiographic imaging device, such as a digital slot scan mammographic imaging device, by reducing detected scatter and processing detector information to compensate for scatter effects. Spatial intensity profile information together with other imaging signal and patient dependent parameters can be used in image processing to estimate and compensate for various scatter effects including single and multiple scatters and Compton and Rayleigh scatter.

摘要翻译： 通过减少检测到的散射和处理检测器信息来补偿散射效应，放射线照相成像装置（例如数字缝隙扫描乳腺摄影成像装置）中的散射效应降低。 空间强度分布信息与其他成像信号和患者相关参数一起可用于图像处理，以估计和补偿包括单次和多次散射以及康普顿和瑞利散射的各种散射效应。

公开(公告)号：US06950493B2

公开(公告)日：2005-09-27

申请号：US10877019

申请日：2004-06-25

申请人： Guy M. Besson

发明人： Guy M. Besson

IPC分类号： A61B6/00 ,  A61B6/02 ,  A61B6/03 ,  A61B6/04 ,  A61B6/06 ,  G01N23/00 ,  G21K1/10 ,  G21K1/12 ,  H05G1/60

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/0457 ,  A61B6/06 ,  A61B6/4028 ,  A61B6/4035 ,  A61B6/4042 ,  A61B6/405 ,  A61B6/4085 ,  A61B6/4241 ,  A61B6/4275 ,  A61B6/4441 ,  A61B6/4488 ,  A61B6/482 ,  A61B6/484 ,  A61B6/488 ,  A61B6/508 ,  A61B6/5288 ,  A61B6/541 ,  A61B6/542 ,  A61B6/563 ,  A61B6/583 ,  G21K1/10 ,  Y10S378/901

摘要： A multispectral X-ray imaging system uses a wideband source and filtration assembly to select for M sets of spectral data. Spectral characteristics may be dynamically adjusted in synchrony with scan excursions where an X-ray source, detector array, or body may be moved relative to one another in acquiring T sets of measurement data. The system may be used in projection imaging and/or CT imaging. Processed image data, such as a CT reconstructed image, may be decomposed onto basis functions for analytical processing of multispectral image data to facilitate computer assisted diagnostics. The system may perform this diagnostic function in medical applications and/or security applications.

摘要翻译： 多光谱X射线成像系统使用宽带源和过滤组件来选择M组光谱数据。 可以与X射线源，检测器阵列或体相对于彼此移动以获取T组测量数据的扫描偏移同步地动态地调整光谱特性。 该系统可用于投影成像和/或CT成像。 诸如CT重建图像的处理图像数据可以被分解成用于多光谱图像数据的分析处理的基础功能以便于计算机辅助诊断。 该系统可以在医疗应用和/或安全应用中执行该诊断功能。

公开(公告)号：US06418185B1

公开(公告)日：2002-07-09

申请号：US09376899

申请日：1999-08-18

申请人： Guy M. Besson ,  Armin H. Pfoh

发明人： Guy M. Besson ,  Armin H. Pfoh

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  G06T1/0007 ,  H04N5/32

摘要： A single-slice data acquisition system (DAS) for a CT imaging system is time-multiplexed to measure more than one signal over the DAS standard sampling time interval. In one embodiment, a detector element includes a scintillator and two photodiodes aligned with respective portions of the scintillator. Each photodiode generates a signal based on the scintillator output. The signal from one of the photodiodes is subjected to a time-dependent gain during consecutive sampling intervals. The gain-adjusted signal and the signal from the other photodiode are combined, and the combined signal is processed to obtain an estimate of the z-derivative of the signal. The estimated z-derivative is then used to generate a high quality image.

摘要翻译： 用于CT成像系统的单切片数据采集系统（DAS）进行时间复用以通过DAS标准采样时间间隔测量多于一个信号。 在一个实施例中，检测器元件包括与闪烁体的各个部分对准的闪烁体和两个光电二极管。 每个光电二极管产生基于闪烁体输出的信号。 来自一个光电二极管的信号在连续采样间隔期间经受时间依赖的增益。 增益调整信号和来自另一光电二极管的信号被组合，并且处理组合信号以获得信号的z-导数的估计。 然后使用估计的z导数来生成高质量图像。

公开(公告)号：US06411670B1

公开(公告)日：2002-06-25

申请号：US09437430

申请日：1999-11-17

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： The present invention, in one aspect, is a method for producing an enhanced tomographic image of an object. The method includes steps of obtaining fan beam projection data of the object from a tomographic scan; rebinning the fan beam projection data into a quantity of parallel projection data points; applying interpolation to the quantity of parallel projection data points to increase the quantity of parallel projection data points; and generating a tomographic image from the increased quantity of parallel projection data points.

摘要翻译： 本发明在一个方面是一种用于制造物体的增强断层图像的方法。 该方法包括以下步骤：从断层扫描获得物体的扇形束投影数据; 将扇形投影数据重新组合成一定数量的平行投影数据点; 对平行投影数据点的数量应用插值以增加平行投影数据点的数量; 以及从增加量的平行投影数据点产生断层图像。

公开(公告)号：US5761267A

公开(公告)日：1998-06-02

申请号：US773082

申请日：1996-12-26

申请人： Guy M. Besson

发明人： Guy M. Besson

IPC分类号： A61B6/03 ,  G06T1/00 ,  G06T11/00

CPC分类号： G06T11/005 ,  Y10S378/901

摘要： The present invention, in one embodiment, is a system for performing image reconstruction from unfiltered scan data acquired in a tomographic scan. More specifically, the system implements an algorithm for unfiltered scan data which eliminates the requirement that the scan data for a particular view be fully filtered for image reconstruction. Particularly, unfiltered scan data for a base view is fully filtered to generate filtered scan data for the base view. At least a portion of the filtered scan data for the base view is then used for subsequent views. Particularly, for a subsequent view, only the high frequency components of unfiltered scan data for that view are filtered with a short filter. The filtered high frequency components then are added to the low frequency components of the filtered base view scan data to estimate fully filtered scan data for the subsequent view.

摘要翻译： 在一个实施例中，本发明是一种用于从在断层扫描中获取的未经滤波的扫描数据执行图像重建的系统。 更具体地说，该系统实现了一种用于未经滤波的扫描数据的算法，该算法消除了将特定视图的扫描数据完全滤波以进行图像重建的要求。 特别地，用于基本视图的未过滤的扫描数据被完全过滤以生成用于基本视图的滤波的扫描数据。 然后，用于基本视图的过滤的扫描数据的至少一部分用于后续视图。 特别地，对于后续视图，仅用短滤波器过滤用于该视图的未滤波扫描数据的高频分量。 然后将经过滤波的高频分量加到经滤波的基视图扫描数据的低频分量中，以估计后续视图的完全滤波的扫描数据。

公开(公告)号：US5734691A

公开(公告)日：1998-03-31

申请号：US779960

申请日：1996-12-23

申请人： Hui Hu ,  Guy M. Besson ,  Hui David He

发明人： Hui Hu ,  Guy M. Besson ,  Hui David He

IPC分类号： A61B6/03 ,  G01T1/29 ,  G06T1/00

CPC分类号： G01T1/2985 ,  A61B6/5258 ,  A61B6/032 ,  A61B6/4078 ,  Y10S378/901

摘要： The present invention, in one form, corrects any error due to varying detector cell gains in the z-direction represented in data obtained by a scan in a CT system. The CT system includes an x-ray source which emits an x-ray beam from a focal spot, through a collimator aperture, and towards a detector having a plurality of detector cells. The geometry of the x-ray beam, the width of the collimator aperture and the focal spot size are used to determine the z-profile of the x-ray beam across the detector cells. Such z-profile is used to identify effective detector cell gains. The identified effective detector cell gains, rather than actual detector cell gains, are used to correct errors due to varying detector cell gains. Particularly, the identified effective detector cell gains are employed in a known correction algorithm to correct errors. A local average in an x-direction of actual detector cell gain z-profiles is used to determine a non-rectangular norm detector gain z-profile. In one form of the present invention, and after correcting the image data for beam-hardening, the data is passed through a highpass filter to remove any data representing relatively slow, or low frequency, changes. Next, the filtered data is clipped and view averaged to remove high frequency data contents due to the objects being imaged. A slope estimate is then created. Using the slope estimate, an error estimate is generated. The error estimate is then subtracted from the beam-hardened corrected data, for example. As a result, errors due to z-axis gain variation of the detector cells are removed from the projection data array.

摘要翻译： 本发明以一种形式，校正由于在CT系统中通过扫描得到的数据中所表示的在z方向上的检测器单元增益的变化的任何错误。 CT系统包括一个x射线源，它从焦点，准直器孔口发射X射线束，并朝向具有多个检测器单元的检测器发射。 X射线束的几何形状，准直器孔径的宽度和焦点尺寸用于确定穿过检测器单元的x射线束的z谱。 这种z轮廓用于识别有效的检测器细胞增益。 识别的有效检测器单元增益而不是实际的检测器单元增益用于校正由于检测器单元增益的变化引起的误差。 特别地，在已知的校正算法中采用所识别的有效检测器单元增益来校正误差。 使用实际检测器单元增益z-profile在x方向上的局部平​​均值来确定非矩形范数检测器增益z轮廓。 在本发明的一种形式中，并且在校正用于束强化的图像数据之后，数据通过高通滤波器以去除表示相对较慢或低频变化的任何数据。 接下来，由于对象被成像，滤波后的数据被剪切并且被平均以去除高频数据内容。 然后创建斜率估计。 使用斜率估计，产生误差估计。 然后，例如，从波束硬化校正数据中减去误差估计。 结果，从投影数据阵列中去除了由于检测器单元的z轴增益变化引起的误差。