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    Monochromatic X-ray tube radiation with a screen of high atomic number for higher fluorescent radiation output
    21.
    发明授权
    Monochromatic X-ray tube radiation with a screen of high atomic number for higher fluorescent radiation output 失效
    具有高原子数的屏幕用于高荧光辐射输出的单色X射线管辐射

    公开(公告)号：US5157704A

    公开(公告)日：1992-10-20

    申请号：US704241

    申请日：1991-05-22

    Applicant: Geoffrey Harding

    Inventor： Geoffrey Harding

    IPC: H01J35/02 ,  H01J35/04

    CPC classification number: H01J35/04 ,  H01J35/02

    Abstract: A monochromatic X-ray radiation source includes an anode for producing X-ray radiation, a target enclosed by the anode for converting X-ray radiation into fluorescence radiation and a screen located between the target and the anode for screen the target from electrons. A higher output of fluorescence radiation is attained in that the screen comprises an element having an atomic number greater than 50, for example, tungsten or tantalum.

    Abstract translation: 单色X射线辐射源包括用于产生X射线辐射的阳极，由阳极包围的用于将X射线辐射转换为荧光辐射的靶和位于靶和阳极之间的屏幕，用于从电子屏蔽靶。 获得更高的荧光辐射输出，因为屏幕包括原子序数大于50的元素，例如钨或钽。

    X-ray source
    22.
    发明授权
    X-ray source 失效
    X射线源

    公开(公告)号：US4723263A

    公开(公告)日：1988-02-02

    申请号：US860414

    申请日：1986-05-07

    Applicant: Curtis Birnbach ,  Jay Tanner ,  Richard Heese

    Inventor： Curtis Birnbach ,  Jay Tanner ,  Richard Heese

    IPC: H05G1/00 ,  G21K1/02 ,  H01J35/00 ,  H01J35/04 ,  H01J35/08 ,  H01J35/14 ,  H01S4/00 ,  H05G2/00 ,  H01J35/06

    CPC classification number: G21K1/02 ,  H01J35/00 ,  H01J35/04 ,  H01J35/08 ,  H01J35/14 ,  H01S4/00 ,  H05G2/00 ,  H01J2235/087

    Abstract: An X-ray source with a cathode formed as a cylindrical electrode having a hollow central anode tube on its axis, with a grid surrounding the anode and interposed between the anode and cathode. The central anode tube is hollow and filled with a working medium. A high negative voltage is applied to the cathode, but the flow of electrons to the anode is blocked by the grid which is held near cathode potential. After a space charge is created at the grid by electrons from the cathode, a very short pulse to ground is applied to one end of the grid, yielding a relativistic wave of potential which propagates along the axial length of the grid. This wave of potential releases the electrons from the cathode, which flow directly to the anode. The impingement of the electrons on the tubular anode produces X-rays from the interior surface of the anode tube. These X-rays, together with the impinging electrons, pump the working medium along the length of the anode, causing a population inversion leading to the release of coherent X-rays in a wave synchronized with the propagating grid potential which exits the structure at the far end of the anode. The X-ray source may consist of identical units coupled together in series to provide a high power X-ray beam, and may be configured in other than cylindrical shapes depending on the output desired.

    Abstract translation: 具有阴极的X射线源形成为圆柱形电极，在其轴上具有中空中心阳极管，围绕阳极的栅格并且介于阳极和阴极之间。 中央阳极管是中空的并且填充有工作介质。 对阴极施加高的负电压，但是电子流向阳极的电流被保持在阴极电位附近的栅极阻挡。 在栅极通过电子从阴极产生空间电荷之后，将非常短的脉冲对地施加到栅格的一端，产生相对论的电势波沿着栅格的轴向长度传播。 这种电势波从阴极释放电子，其直接流到阳极。 电子在管状阳极上的撞击从阳极管的内表面产生X射线。 这些X射线与撞击的电子一起沿着阳极的长度泵送工作介质，导致总体反转，导致在与传播网格电位相反的传播网格电位同步的波中释放相干X射线 阳极的远端。 X射线源可以由串联耦合在一起的相同单元组成，以提供高功率X射线束，并且可以根据所需的输出而被配置为除了圆柱形外形。

    Graphite cathode cup for gridded x-ray tubes
    23.
    发明授权
    Graphite cathode cup for gridded x-ray tubes 失效
    用于网格X射线管的石墨阴极杯

    公开(公告)号：US4673842A

    公开(公告)日：1987-06-16

    申请号：US771696

    申请日：1985-09-03

    Applicant: Ronald D. Grieger ,  Sepehr Fariabi ,  Joshua O. Kolawole

    Inventor： Ronald D. Grieger ,  Sepehr Fariabi ,  Joshua O. Kolawole

    IPC: H01J35/04 ,  H01J35/06 ,  H01J1/48 ,  H01J9/14

    CPC classification number: H01J35/04 ,  H01J35/06

    Abstract: A cathode cup structure for a high voltage x-ray tube having a base formed of a weldable material and an exposed upper surface of a non-weldable material bonded to the base. The upper surface may be machined from a block of graphite to form an appropriate cathode cup structure configuration and then bonded to a base formed of TZM using a platinum brazing compound. The graphite upper surface may be coated with pyroltic carbon to reduce dust or alternatively, may be formed of a composition of silicon carbide graphite to minimize dusting problems. The graphite composition of the upper section of the cathode cup minimizes the risk of welding of an electron emissive filament passing through the cup structure.

    Abstract translation: 一种用于高电压X射线管的阴极杯结构，其具有由可焊接材料形成的基底和与基底结合的不可焊接材料的暴露的上表面。 上表面可以由一块石墨加工形成适当的阴极杯结构，然后使用铂钎焊化合物与由TZM形成的基底结合。 石墨上表面可以涂覆有热解碳以减少灰尘，或者可以由碳化硅石墨的组合物形成以最小化除尘问题。 阴极杯上部的石墨组成使通过杯结构的电子发射丝的焊接风险最小化。

    X-ray source employing cold cathode gas discharge tube with collimated beam
    24.
    发明授权
    X-ray source employing cold cathode gas discharge tube with collimated beam 失效
    采用具有准直光束的冷阴极气体放电管的X射线源

    公开(公告)号：US4670894A

    公开(公告)日：1987-06-02

    申请号：US736136

    申请日：1985-05-20

    Applicant: Curtis Birnbach ,  Jay Tanner

    Inventor： Curtis Birnbach ,  Jay Tanner

    IPC: H01J35/06 ,  G21K1/02 ,  H01J35/04 ,  H01J35/08 ,  H01J35/14 ,  H05G2/00 ,  H01J35/30

    CPC classification number: H01J35/14 ,  G21K1/02 ,  H01J35/04 ,  H01J35/08 ,  H05G2/00 ,  H01J2235/087

    Abstract: An X-ray tube has a wide area cold cathode with a graphite felt surface which faces and is spaced from a wide area anode of high atomic number material. A grid is interposed between the two and the anode, grid and cathode are enclosed in an envelope which is filled with gas at a low pressure. The graphite surface of the cathode is connected to a relatively high negative potential so that electrons are emitted from the entire surface area and impinge upon the anode, after triggering by the grid. The distribution of the energy of photons emitted from the anode is relatively constant during the ignition period of the tube. An extremely wide area X-ray source is then defined having constant bremstrahlung content which enables good gray scale measurements when employing the X-ray source. A pinhole collimator disposed externally of the tube ensures collimation of the output X-ray field. A polarized electron beam is used as a collimator in place of the pinhole collimator, in a preferred embodiment, to produce a collimated, wide area X-ray flux. The cathode, grid and anode structure can have any desired size or shape. The X-ray source can be flat and sized to illuminate a chest X-ray film or can be arcuate to at least partly wrap around the subject to be exposed to the X-rays. Arcuate X-ray sources can be linked end to end and scanned sequentially to define an X-ray source for use in Computer Axial Tomography (CAT) scan type applications. The same computer algorithm used for conventional CAT scan analysis can be used.

    Abstract translation: X射线管具有广泛的冷阴极，石墨毡表面面向并与高原子序数材料的广域阳极隔开。 栅格插在两个阳极之间，栅极和阴极被封闭在一个充满低压气体的封套内。 阴极的石墨表面连接到相对较高的负电位，使得电子从整个表面区域发射并在电网触发之后撞击阳极。 在管的点火期间，从阳极发射的光子的能量分布相对恒定。 然后定义了非常广泛的X射线源，其具有恒定的脉冲射线含量，当使用X射线源时能够进行良好的灰度测量。 设置在管外部的针孔准直器确保输出X射线场的准直。 在优选实施例中，偏振电子束用作准直器来代替针孔准直器，以产生准直的广域X射线通量。 阴极，栅极和阳极结构可以具有任何期望的尺寸或形状。 X射线源可以是平坦的和大小的以照亮胸部X射线胶片，或者可以是弓形的，以至少部分地围绕被摄体暴露于X射线。 弧形X射线源可以端对端连接并依次扫描，以定义用于计算机轴向层析成像（CAT）扫描类型应用的X射线源。 可以使用用于常规CAT扫描分析的相同的计算机算法。

    X-ray tube
    26.
    发明授权
    X-ray tube 失效
    X射线管

    公开(公告)号：US3719846A

    公开(公告)日：1973-03-06

    申请号：US3719846D

    申请日：1971-01-08

    Applicant: PHILIPS CORP

    Inventor： BERENDS W ,  JACOB H ,  EGGELSMANN H

    IPC: H01J35/04 ,  H01J35/24 ,  H01J35/14

    CPC classification number: H01J35/24 ,  H01J35/04

    Abstract: The invention relates to an X-ray tube in which the anode and the cathode are accommodated in two parallel adjacent envelopes which are interconnected by a tubular member through which the electron beam passes. At high voltage (300 kV and higher) the direction of the electron beam and the direction of the maximum of the X-rays are inclined at an obtuse angle to one another. Thus the electrons impinge on the target nearly at grazing incidence. Even at slight deviation of the relative positions of the anode and cathode envelopes from the prescribed positions the focal spot is greatly shifted. According to the invention the two envelopes are relatively movable, causing substantially a deformation of the coupling member only which is capable of deformation owing to the use of an appropriate construction and/or a suitable material.

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