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    X-ray densitometer detector calibration by beam flattening and continuous dark scanning
    4.
    发明授权
    X-ray densitometer detector calibration by beam flattening and continuous dark scanning 失效
    X射线密度计检测器通过光束平整和连续暗扫描进行校准

    公开(公告)号：US5771272A

    公开(公告)日：1998-06-23

    申请号：US484568

    申请日：1995-06-07

    申请人： Noah Berger ,  Tom Richardson ,  Eric von Stetten ,  Howard P. Weiss

    发明人： Noah Berger ,  Tom Richardson ,  Eric von Stetten ,  Howard P. Weiss

    IPC分类号： A61B6/00 ,  A61B6/04 ,  A61B6/06 ,  A61B6/08 ,  G21K1/10 ,  G21K5/10 ,  G01D18/00

    CPC分类号： G21K1/10 ,  A61B6/0421 ,  A61B6/0457 ,  A61B6/06 ,  A61B6/08 ,  A61B6/482 ,  A61B6/488 ,  A61B6/505 ,  A61B6/405 ,  A61B6/548 ,  A61B6/583

    摘要： Variations in x-ray beam, filtration and detector gain characteristics are corrected by a multiple thickness flattening system. Preferably, an automatic multi-position attenuator mechanism inserts into the x-ray beam one or more flat reference attenuators of uniform composition. Thereafter, the response at each detector channel is measured. Unique factors are thus collected for each channel at multiple attenuation levels. An overall uniform response across the scan field is achieved by applying these correction factors to subsequent scan data. The current system compensates for detector gain by alternately turning X-rays on and off, so that dark level measurements can be interspersed with X-ray signal measurements. Detector offsets are eliminated in a linear data representation, while beam and detector flattening corrections are applied in a logarithmic data representation.

    摘要翻译： x射线束的变化，过滤和检测器增益特性通过多重厚度平坦化系统进行校正。 优选地，自动多位置衰减器机构将均匀组成的一个或多个扁平参考衰减器插入到x射线束中。 此后，测量每个检测器通道的响应。 因此，以多个衰减级别为每个通道收集唯一因子。 通过将这些校正因子应用于后续的扫描数据来实现扫描场的整体均匀响应。 当前系统通过交替地将X射线开启和关闭来补偿检测器增益，使得暗电平测量可以穿插X射线信号测量。 检测器偏移在线性数据表示中被消除，而波束和检测器平坦化校正被应用在对数数据表示中。

    Whole-body x-ray bone densitometry using a narrow-angle fan beam, including variable fan beam displacement between scan passes
    9.
    发明授权
    Whole-body x-ray bone densitometry using a narrow-angle fan beam, including variable fan beam displacement between scan passes 失效
    全身x射线骨密度测定使用窄角扇形束，包括扫描通道之间的可变扇形光束位移

    公开(公告)号：US5838765A

    公开(公告)日：1998-11-17

    申请号：US486368

    申请日：1995-06-07

    申请人： Russell J. Gershman ,  Richard E. Cabral ,  Noah Berger ,  Jay A. Stein

    发明人： Russell J. Gershman ,  Richard E. Cabral ,  Noah Berger ,  Jay A. Stein

    IPC分类号： A61B6/00 ,  A61B6/04 ,  A61B6/06 ,  A61B6/08 ,  G21K1/10 ,  G21K5/10

    CPC分类号： A61B6/06 ,  A61B6/0421 ,  A61B6/0457 ,  A61B6/08 ,  A61B6/482 ,  A61B6/488 ,  A61B6/505 ,  G21K1/10 ,  A61B6/405 ,  A61B6/548 ,  A61B6/583

    摘要： A whole body x-ray bone densitometry system includes a table extending parallel to a Y-axis of an XYZ coordinate system for supporting a patient at a patient position; an x-ray source for emitting a narrow angle fan beam of x-rays to irradiate at any one time a scan line which is transverse to the Y-axis and is substantially shorter than the width of a body cross-section of a typical adult patient occupying the patient position. An x-ray detector is aligned with the source along a source-detector axis which is transverse to the Y-axis, for receiving x-rays from the source within the angle of the fan beam after passage thereof through the patient position. The detector has a number of detecting elements arranged along a direction transverse to the Y-axis and to the source-detector axis. A source-detector support on which the source and detector are mounted at opposite sides of the patient position is coupled with a scanning mechanism moving at least one of the patient table and the source-detector support relative to the other to scan the patient position with the narrow angle fan beam in successive scans parallel to the Y-axis in which the source-detector axis is at different angles relative to the patient position as between different ones of successive scans, but in each of the successive scans, an origin of the fan beam in the source is at the same vertical distance from the patient table. The distance between the fan beam origin and the table may be selectively varied between scan passes, in order to vary scan pass magnification.

    摘要翻译： 全身x射线骨密度测定系统包括平行于XYZ坐标系的Y轴延伸的表，用于将病人支撑在患者位置; x射线源，用于发射X射线的窄角扇形束，以在任何一个时刻照射横向于Y轴的扫描线，并且基本上比典型成年人的身体横截面的宽度短 患者占据病人的位置。 X射线检测器沿着横向于Y轴的源 - 检测器轴与源对准，用于在通过患者位置之后在扇形束的角度内从源收到X射线。 检测器具有沿横向于Y轴和源检测器轴线的方向布置的多个检测元件。 源和检测器安装在患者位置的相对侧处的源检测器支撑件与扫描机构联接，扫描机构相对于另一个移动患者台和源检测器支撑件中的至少一个，以扫描患者位置， 平行于Y轴的连续扫描中的窄角风扇光束，其中源 - 检测器轴线相对于患者位置处于不同的连续扫描之间的不同角度，但是在每个连续扫描中， 源中的扇形光束与患者台处于相同的垂直距离。 可以在扫描通过之间选择性地改变风扇光束原点和台之间的距离，以便改变扫描通过倍率。

    X-ray bone densitometry
    10.
    发明授权
    X-ray bone densitometry 失效
    X光骨密度测定

    公开(公告)号：US5748705A

    公开(公告)日：1998-05-05

    申请号：US524997

    申请日：1995-09-08

    申请人： Jay A. Stein ,  Noah Berger

    发明人： Jay A. Stein ,  Noah Berger

    IPC分类号： A61B6/00 ,  A61B6/04 ,  A61B6/06 ,  A61B6/08 ,  G21K1/10 ,  G21K5/10 ,  H05G1/64

    CPC分类号： A61B6/06 ,  A61B6/0421 ,  A61B6/0457 ,  A61B6/08 ,  A61B6/482 ,  A61B6/488 ,  A61B6/505 ,  G21K1/10 ,  A61B6/405 ,  A61B6/548

    摘要： An x-ray bone densitometry system includes a table having a movable support surface configured to support a patient, an x-ray source and an x-ray detector positioned on opposite sides of said support surface so that a patient positioned on the support surface is between the x-ray source and the x-ray detector, the x-ray source and the x-ray detector being aligned in a fixed relationship relative to each other such that x-rays emitted from the source impinge the x-ray detector, the x-rays that impinge the detector producing dual energy scan data, a processor coupled to the x-ray source, the x-ray detector and the table and configured to actuate movement of said support surface, to receive the dual energy scan data, to extract from the dual energy scan data, dual energy image data and single energy image data, and to store the dual energy and the single energy image data in respective data records for selective display, and at least one display connected to the processor for displaying the dual energy and/or the single energy image data. Methods for displaying single energy and dual energy images on the display are also provided.

    摘要翻译： x射线骨密度测定系统包括具有被配置为支撑患者的可移动支撑表面的桌子，位于所述支撑表面的相对侧上的x射线源和x射线检测器，使得位于支撑表面上的患者是 在x射线源和X射线检测器之间，X射线源和x射线探测器相对于彼此以固定的关系对准，使得从源射出的x射线照射x射线检测器， 撞击检测器的X射线产生双能量扫描数据，处理器耦合到x射线源，x射线检测器和台并且被配置为致动所述支撑表面的移动，以接收双能量扫描数据， 从双能量扫描数据提取双能量图像数据和单能量图像数据，并将双能量和单能量图像数据存储在用于选择性显示的相应数据记录中，以及连接到处理器的至少一个显示器，用于显示 t 他的双能量和/或单能量图像数据。 还提供了在显示器上显示单能量和双能量图像的方法。