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    • 3. 发明授权
    • X-ray diagnostic generator
    • X光诊断发生器
    • US4238681A
    • 1980-12-09
    • US80042
    • 1979-09-28
    • Johann SeisslKarlheinz BroennerHartmut Krause
    • Johann SeisslKarlheinz BroennerHartmut Krause
    • G05F1/30H05G1/14H05G1/32H05G1/30
    • H05G1/32G05F1/30H05G1/14
    • In an exemplary embodiment, a bridge rectifier is coupled with the primary circuit of the high voltage transformer. In the d.c. current branch of the bridge rectifier, a smoothing capacitor and a thyristor are arranged. The thyristor is turned on and off with a pulse duty cycle which determines the capacitor voltage and hence the x-ray tube voltage. At the thyristor, an LC-oscillatory circuit is connected whose capacitance when the thyristor is conductive, is discharged via the latter and which effects the extinction of the thyristor via a free-running diode which is conductive in return oscillation phase and which is disposed parallel to the thyristor. In this manner, a high switching frequency of the thyristor and hence a minimal ripple of the x-ray tube voltage can be achieved.
    • 在示例性实施例中,桥式整流器与高压变压器的初级电路耦合。 在d.c. 布置了桥式整流器的电流分支,平滑电容器和晶闸管。 晶闸管通过脉冲占空比导通和关断,从而确定电容器电压,从而确定X射线管电压。 在晶闸管上连接一个LC振荡电路,其晶闸管导通时的电容通过后者放电,并通过一个自由运行的二极管来消除晶闸管,该二极管在回波振荡阶段是导通的,并且并联 到晶闸管。 以这种方式,可以实现晶闸管的高开关频率,从而实现X射线管电压的最小纹波。
    • 5. 发明授权
    • Method and apparatus for multi-planar radiation emission for imaging
    • 用于成像的多平面辐射发射的方法和装置
    • US6097788A
    • 2000-08-01
    • US59439
    • 1998-04-14
    • Alex BerensteinNorbert KrauseJohann Seissl
    • Alex BerensteinNorbert KrauseJohann Seissl
    • H04N7/18A61B6/02H05G1/70
    • H05G1/70
    • An multi-planar radiation emission system, preferably an X-ray biplanar transillumination system, for generating planar images of a subject from different perspectives includes a first X-ray source which emits first pulses of X-ray radiation toward a subject from a first direction at a first repetition rate, a first imaging device which detects the first pulses and generates a first image of the subject from a first perspective, a second X-ray source which emits second pulses of X-ray radiation toward the subject from a second direction at a second repetition rate which is different from the first repetition rate, wherein the first and second pulses are temporally interleaved and non-overlapping, and a second imaging device which detects the second pulses and generates a second image of the subject from a second perspective. The first and second images are preferably planar images which are "moving" images in the sense that information from successive pulses is used to periodically update the planar images on a display. The relative reduction of the pulse repetition rate of the pulses used to generate one of the two planar images advantageously reduces potentially harmful X-ray emissions and reduces the image processing required to generate the planar images without significantly sacrificing useful information, since one of the two images is generally referred to only occasionally to provide the observer with a three-dimensional perspective of the planar image of greater interest.
    • 用于从不同的角度产生被摄体的平面图像的多平面辐射发射系统,优选X射线双平面透照系统包括从第一方向向受试者发射X射线辐射的第一脉冲的第一X射线源 以第一重复率,第一成像装置,从第一角度检测第一脉冲并产生对象的第一图像;第二X射线源,从第二方向向对象发射X射线辐射的第二脉冲; 以与所述第一重复率不同的第二重复率,其中所述第一和第二脉冲在时间上交错和不重叠,以及第二成像装置,其从第二透视图检测所述第二脉冲并产生所述对象的第二图像 。 第一和第二图像优选地是在移动的图像中的平面图像,这意味着来自连续脉冲的信息被用于周期性地更新显示器上的平面图像。 用于产生两个平面图像之一的脉冲的脉冲重复率的相对减小有利地减少了潜在有害的X射线发射,并且减少了生成平面图像所需的图像处理,而不会显着地牺牲有用信息,因为两者之一 通常仅仅偶尔地将图像提供给观察者以感兴趣的平面图像的三维透视图。