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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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2.发明授权Methods and apparatus for scanning an object in a computed tomography system 有权用于在计算机断层摄影系统中扫描物体的方法和装置公开(公告)号：US06175609B1
公开(公告)日：2001-01-16
申请号：US09295481
申请日：1999-04-20
IPC分类号： A61B603
CPC分类号： G01N23/046 , G01N2223/419
摘要： The present invention, in one form, is a system for reducing contribution of scatter signal to an image of an object constructed from projection data acquired during a computed tomography scan. The system includes an x-ray source which emits an x-ray beam toward a detector array. A collimator plate is movable with respect to the detector array. The system is configured to move the collimator between a first position and a second position. In the first and second positions, the collimator does not cover the detector array, i.e., the collimator does not collimate the x-ray beam impacting the detector array. When moving between the first and second positions, the collimator at least partially covers the detector array, i.e., the collimator at least partially collimates the x-ray beam impacting the detector array. A first signal intensity at the detector array is obtained when the collimator is in the first position and a second signal intensity at the detector array is obtained when the collimator is moved between the first and second position. The determined signal intensities are then utilized to determine the scatter signal of the x-ray beam and to generate substantially uncorrupted projection data.
摘要翻译： 本发明在一种形式中是用于减少散射信号对由在计算机断层摄影扫描期间获取的投影数据构成的物体的图像的贡献的系统。 该系统包括向检测器阵列发射X射线束的x射线源。 准直板相对于检测器阵列是可移动的。 该系统被配置为在第一位置和第二位置之间移动准直器。 在第一和第二位置中，准直器不覆盖检测器阵列，即准直器不准直影响检测器阵列的X射线束。 当在第一和第二位置之间移动时，准直器至少部分地覆盖检测器阵列，即准直器至少部分准直影响检测器阵列的X射线束。 当准直器处于第一位置时，当准直器在第一和第二位置之间移动时，在检测器阵列处获得第一信号强度并且在检测器阵列处获得第二信号强度。 然后利用确定的信号强度来确定x射线束的散射信号并产生基本上未损坏的投影数据。
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公开(公告)号：US07078702B2
公开(公告)日：2006-07-18
申请号：US10064549
申请日：2002-07-25
CPC分类号： H01L27/14601 , G01T1/2018
摘要： A flexible imager, for imaging a subject illuminated by incident radiation, includes a flexible substrate, a photosensor array disposed on the flexible substrate, and a scintillator. The scintillator is disposed so as to receive and absorb the incident radiation, is configured to convert the incident radiation to optical photons, and is optically coupled to the photosensor array. The photosensor array is configured to receive the optical photons and to generate an electrical signal corresponding to the optical photons. A digital imaging method for imaging subject includes conforming flexible digital imager to subject, the subject being positioned between flexible digital imager and a radiation source. The method further includes activating radiation source to expose the subject to radiation and collecting an image with the flexible digital imager.
摘要翻译： 用于对由入射辐射照明的被摄体成像的柔性成像器包括柔性基板，设置在柔性基板上的光电传感器阵列和闪烁体。 闪烁体设置成接收和吸收入射的辐射，被配置为将入射的辐射转换成光学光子，并且光学耦合到光电传感器阵列。 光传感器阵列被配置为接收光学光子并且产生对应于光学光子的电信号。 用于成像对象的数字成像方法包括使受检者适应灵活的数字成像器，该对象位于柔性数字成像器和辐射源之间。 该方法还包括激活辐射源以将受试者暴露于辐射并且利用灵活的数字成像器收集图像。
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4.发明授权Methods and systems for determining x-ray beam position in multi-slice computed tomography scanners 失效用于确定多层计算机断层扫描仪中x射线束位置的方法和系统公开(公告)号：US06370218B1
公开(公告)日：2002-04-09
申请号：US08576066
申请日：1995-12-21
IPC分类号： A61B600
CPC分类号： A61B6/032 , A61B6/4021 , A61B6/4085 , G01N23/046 , G01N2223/419 , H05G1/26
摘要： Focal spot position determination systems having a high sensitivity to focal spot movement for use in connection with multi-slice computed tomography imaging systems are described. In one embodiment, the determination system is configured for application in a two slice system. Signals from adjacent detector cells in separate rows are compared to determine focal spot position. More particularly, the signal intensity A of the signal output by a first detector cell and the signal intensity B of the signal output by the second detector cell are related to the position of the focal spot. That is, the z position of the centerline of the fan beam can be determined by relating the signal intensities A and B according to the ratio [(A−B)/(A+B)]. Such ratio is representative of the beam location and can be used to control adjustment of the imaging system pre-patient collimator to maintain the beam in the desired position.
摘要翻译： 描述了与多层计算机断层成像系统结合使用的对焦点运动具有高灵敏度的焦点位置确定系统。 在一个实施例中，确定系统被配置为在两个切片系统中应用。 比较来自相邻检测器单元在不同行中的信号以确定焦点位置。 更具体地，由第一检测器单元输出的信号的信号强度A和由第二检测器单元输出的信号的信号强度B与焦斑的位置有关。 也就是说，风扇光束的中心线的z位置可以通过根据[（A-B）/（A + B）]的比率与信号强度A和B相关来确定。 这种比率代表光束位置，并且可以用于控制成像系统病人前准直仪的调节，以将光束保持在期望的位置。
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5.发明授权
公开(公告)号：US6047040A
公开(公告)日：2000-04-04
申请号：US282671
申请日：1994-07-29
申请人： Hui Hu , Armin Horst Pfoh
发明人： Hui Hu , Armin Horst Pfoh
CPC分类号： A61B6/032
摘要： A multi-slice or volumetric CT system has a 2D array of detector elements arranged in columns along the slice direction and rows along the in-slice direction. Channels in a digital acquisition system connect to the respective columns and a switch assembly is operated during a scan to sequentially enable detector elements in each column either one or two at a time. By enabling two elements at a time, the SNR of the acquired data is increased and the expected resolution loss in the slice direction is compensated for by detector wobbling.
摘要翻译： 多切片或体积CT系统具有沿切片方向排列的检测器元件的2D阵列和沿切片方向的行。 数字采集系统中的通道连接到相应的列，并且在扫描期间操作开关组件，以依次使每列中的检测器元件一次或两次。 通过一次启用两个元件，获取的数据的SNR增加，并且通过检测器摆动来补偿在切片方向上的预期分辨率损失。
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6.发明授权Methods and apparatus for detecting beam motion in computed tomography imaging systems 失效用于检测计算机断层成像系统中的束运动的方法和装置
公开(公告)号：US5657364A
公开(公告)日：1997-08-12
申请号：US572574
申请日：1995-12-14
申请人： Armin Horst Pfoh
发明人： Armin Horst Pfoh
CPC分类号： A61B6/035 , A61B6/4021 , G01N23/046 , G01N2223/419
摘要： An attenuator and detector cell arrangement for generating a signal ratio representative of focal spot position is described. The ratio is highly sensitive to focal spot position and facilitates generating, or reconstructing, a high quality image from the projection data. Further, and importantly, even if one detector cell is fully flooded, the signal intensity from such cell will vary depending upon the alignment between the focal spot and attenuator slot. Therefore, the focal spot movement detector is effective for detecting fan beam movement even if the detector cell is fully flooded. In one embodiment, the x-ray beam attenuator is configured to be positioned over the detecting surface of z-position detection cells. Slots or openings extend through the attenuator so that at least a portion of each detector cell is in free communication with an x-ray beam from the x-ray source. The slots are positioned and oriented so that one detector cell signal has its highest x-ray response at one extreme position along the focal spot trajectory and the other detector cell has its highest x-ray response at the other extreme position along the focal spot trajectory.
摘要翻译： 描述了用于产生代表焦点位置的信号比的衰减器和检测器单元布置。 该比率对焦斑位置高度敏感，并且便于从投影数据生成或重建高质量图像。 此外，并且重要的是，即使一个检测器单元被完全淹没，来自这样的单元的信号强度将根据焦斑和衰减器槽之间的对准而变化。 因此，即使检测器电池完全充满，焦斑运动检测器也可有效检测风扇光束运动。 在一个实施例中，x射线束衰减器被配置为位于z位置检测单元的检测表面上方。 狭槽或开口延伸穿过衰减器，使得每个检测器单元的至少一部分与来自x射线源的x射线束自由连通。 狭槽定位和定向，使得一个检测器单元信号沿着焦点轨迹在一个极端位置具有最高的x射线响应，另一个检测器单元在沿着焦点轨迹的另一极端位置处具有最高的x射线响应 。
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