Abstract:
An x-ray tube includes a frame, an anode for generating x-rays disposed within the frame, a cathode disposed within the frame, where the cathode is configured to selectively emit an electron beam toward the anode, and at least one heating element disposed within the frame and configured to heat a portion of the anode.
Abstract:
A mechanical interface assembly that includes an adjustable element having first and second states such that in the first state, the adjustable element is radially compliant, and in the second state, the adjustable element is substantially non-radially compliant. The adjustable element also includes a mating element configured to interface with a mating component. The mechanical interface assembly further includes an adjustment element configured to interface with the adjustable element such that a first position of the adjustment element corresponds to the first state of the adjustable element, and a second position of the adjustment element corresponds to the second state of the adjustable element.
Abstract:
Device for generating X-ray or XUV radiation includes a device for directing a particle beam of electrically charged particles towards a target. A deflection device for deflecting the particle beam is such that the central axis of the particle beam passes through a first point of deflection and a second point of deflection located at a distance from the first point of deflection in the direction of propagation of the beam. The first and second points of deflection lie on an axis in line with a determined or determinable point of impact of the particle beam with the target. The particle beam can be deflected by the deflection device in the direction of propagation of the beam in the region of one point of deflection independently from of a deflection of the particle beam in the region of the other point of deflection.
Abstract:
In a method to detect the pressure in an x-ray tube having a cathode of the x-ray tube that is heated with a heater current, and wherein electrons are accelerated between the cathode and an anode by an applied x-ray tube voltage, the heater current is measured, a tube current corresponding to the tube -ray voltage is measured, the difference between the measured heater current and the measured tube current is determined or the temporal change of the measured heater current or of the measured tube current is determined, the difference or the temporal change is compared with predetermined calibration values, and a value representing the pressure in the x-ray tube is determined from the comparison.
Abstract:
The invention relates to a particle accelerator. The accelerator comprises a chamber (h) made of conducting material having a central axis; an anode (a) connected electrically to the chamber along the central axis; a cathode (b) housed in the chamber along the central axis; an insulating element (c) connecting the cathode to the chamber, the insulating element comprising several sections separated by electrodes (k1 to k6). The insulator lies inside the chamber (h) along the central axis in the extension of the region formed by the anode (a) and the cathode (b).
Abstract:
The present invention relates to structures within an x-ray device including an x-ray can, an x-ray can window frame insert, a rotor sleeve, and a bearing support assembly for a rotor structure. The various structures are fabricated from a chromium alloy of copper that is essentially oxygen free copper having a minor amount of chromium, the combination of which imparts desirable qualities to the x-ray device structures, including efficient heat sink and emissivity qualities that are beneficial in an x-ray device environment. In one preferred embodiment of the present invention, oxygen free high conductivity (OFHC) copper is melted in an RF furnace in the presence of a minor amount of chromium and is either ingot cast or powder metallurgically cast into a desired article and further fabricated into a finished article.
Abstract:
A toroidal x-ray tube (I) is supported and selectively positioned by a gantry (II). The x-ray tube includes a toroidal housing (A) in which a rotor (20) is rotatably mounted. One or more cathodes (C) are mounted on the rotor for generating an electron beam which strikes an anode (B) to generate a beam of x-rays which pass through a patient aperture (62) to strike a detector (60). The x-ray tube includes pre-collimators (70, 74) having slots (72, 76) for passage of the x-ray subsequent to generation thereof and prior to being collimated by the collimator (90). A ring collimator (90) collimates an x-rays formed into a fan shaped beam. The collimator (90) includes a first ring (92) and a second ring (94) which are concentric. The distance between the first and second rings (92, 94) is adjustable to adjust the slice thickness of the final image. The x-ray tube provides improved final images in that reduction of off-focal radiation occurs due to the utilization of pre-collimators and the collimation of x-rays is flexible due to adjustability of slice thickness.
Abstract:
A toroidal x-ray tube (I) is supported (II) for rotation about a horizontal axis (170), translation along a vertical axis (172), and translation along a horizontal axis (174). The x-ray tube includes a toroidal housing (A), an annular anode (B), and a cathode (0) which rotates a beam of electrons around the annular anode. A plurality of parallel connected voltage sources (90.sub.1, 90.sub.2, . . . , 90.sub.n) provide a sufficiently high bias voltage between the electron source and the anode that x-rays are generated. The x-ray beam passes through a compensator crystal (62), an annular window (20), a collimator (132), through a subject received in a central bore (26) of the x-ray tube, and impacts an arc segment of radiation detectors (130). The x-ray detectors are stationarily mounted outside of the plane of the annular window (FIGS. 2 and 7), nutate into the plane of the windows opposite of the origin of the x-ray beam (FIG. 6 ), rotate in part (FIG. 9 ) or rotate in full (FIG. 8 ) Angular position monitors (58, 154) determine the angular position of the cathode assembly, hence the x-ray beam, and the angular position of the detectors in the rotating detector embodiment.
Abstract:
In high-voltage vacuum-tubes, specifically X-ray tubes, comprising an electrode (anode) which carries a positive high voltage and which is connected to a conductive part (for example the metal tube envelope) via an insulator, flashover may occur at very high temperatures. In order to preclude such flashover a shielding electrode is arranged at a small distance from the insulator and has such a shape that the electric field strength at the location where the insulator is connected to the conductive part is reduced.
Abstract:
A dental x-ray aligning system in which various Hall effect sensors, mounted on a dental x-ray apparatus, detect the magnetic field strength resulting from a magnet which is attached to an x-ray film plate located within the mouth of a patient. By measuring and comparing the relative magnetic field strengths, the present invention can indicate when the dental x-ray apparatus is properly aligned, and can also indicate the direction in which the apparatus should be moved to obtain alignment, and the distance between the apparatus and the film plate. The present invention also includes means for adjusting the collimation of the dental x-ray apparatus.