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    • 96. 发明公开
    • Means for preventing excessive heating of an X-ray tube window
    • Einrichtung zur Vermeidung einerÜberhitzungdes Fensters einerRöntgenröhre
    • EP0924742A3
    • 2000-01-05
    • EP98308723.0
    • 1998-10-26
    • PICKER INTERNATIONAL, INC.
    • Harris, Jason P.Carlson, Gerard J.Miller, Lester D.
    • H01J35/18
    • H01J35/18H01J2235/168
    • An x-ray tube includes an envelope (13) defining an evacuated chamber and having a window (30) transmissive to x-rays. An anode assembly and a cathode assembly operate within the envelope to produce x-rays which travel through the window transmissive to x-rays towards a patient or subject under examination. A shield transmissive (32) to x-rays is coupled to the envelope and positioned such that x-rays travelling through the window transmissive to x-rays must first travel through the shield. The shield prevents substantially all secondary electrons created during the production of x-rays from coming into contact with the window transmissive to x-rays thereby preventing excessive heating of the window transmissive to x-rays. An electrode (50) defined by the envelope in a region proximate the window transmissive to x-rays may additionally or alternatively be used to prevent secondary electrons from reaching the window transmissive to x-rays.
    • X射线管包括限定抽真空室并具有透射X射线的窗口(30)的外壳(13)。 阳极组件和阴极组件在外壳内操作以产生X射线,X射线穿过透射窗口的X射线朝向被检查的患者或受试者。 对X射线的屏蔽透射(32)耦合到外壳并定位成使得穿过透射到x射线的窗口的x射线必须首先穿过屏蔽。 屏蔽层防止在X射线生成期间产生的所有二次电子与透射X射线的窗口接触,从而防止透射X射线的窗口的过度加热。 在靠近x射线的窗口附近的区域中由外壳限定的电极(50)可以附加地或替代地用于防止二次电子到达透射X射线的窗口。