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    • 8. 发明申请
    • BONE DENSITOMETER
    • 骨密度测定仪
    • WO1988000697A1
    • 1988-01-28
    • PCT/US1987001659
    • 1987-07-14
    • HOLOGIC, INC.
    • HOLOGIC, INC.STEIN, Jay, A.
    • G01N23/04
    • G01N23/083A61B6/405A61B6/482A61B6/505H05G1/26H05G1/46
    • In an x-ray bone densitometer, a rotating device (12) carries a calibration material through the beam. The densitometer uses an x-ray tube (1) operated at two different voltages to generate a pencil beam (8). An integrating detector (5) is timed to integrate the detector signal of the patient-attenuated beam over each pulse, the signals are converted to digital values and a digital computer (13) converts the set of values produced by the raster scan into a representation of the bone density of the patient. Multiple reference detectors (7, 8) with differing absorbers (9, 10) are used by the system to continuously correct for variation in x-ray tube voltage and current. Calibration is accomplished by the digital computer on the basis of passing the pencil beam through known bone-representing substance as the densitometer scans portions of the patient (4) having bone and adjacent portions having only flesh.
    • 在x射线骨密度计中,旋转装置(12)通过束携带校准材料。 密度计使用在两个不同电压下操作的X射线管(1)来产生笔杆(8)。 积分检测器(5)被定时以将每个脉冲上的患者衰减波束的检测器信号进行积分,信号被转换成数字值,并且数字计算机(13)将由光栅扫描产生的一组值转换为表示 的患者的骨密度。 系统使用具有不同吸收体(9,10)的多个参考探测器(7,8)来连续校正X射线管电压和电流的变化。 基于通过已知的骨代表物质使铅笔束通过已知的骨代表物质进行校准,因为密度计扫描具有骨骼的患者(4)的部分和仅具有肉体的相邻部分。