Abstract: A method of delivering radiation in a session includes delivering radiation towards a patient using a radiation system, wherein the radiation is delivered based at least in part on a physiological phase or a position of the patient, after the radiation is delivered, changing a configuration of the radiation system, wherein the act of changing the configuration is performed independent of at least one motion of the patient, and delivering additional radiation towards the patient after the configuration of the radiation system is changed, wherein the acts of delivering radiation and the act of changing the configuration are performed in response to a processor executing a treatment plan that prescribes a plurality of packages and a transition, the transition prescribing the act of changing the configuration of the radiation system when no radiation is being delivered by the radiation system.

Abstract: Closed-loop circulation for providing liquid metal to an interaction region at which an electron beam is to impact upon the liquid metal to produce X-rays is presented. In a method according to the invention, the pressure of the liquid metal is raised to at least 10 bar using a high-pressure pump. The pressurized liquid metal is then conducted to a nozzle and ejected into a vacuum chamber in the form of a spatially continuous jet. After passage through the vacuum chamber, the liquid metal is collected in a collection reservoir, and the pressure of the liquid metal is raised to an inlet pressure, e.g. using a primer pump, suitable for the inlet of the high-pressure pump. The invention also relates to a corresponding circulation system and an X-ray source provided with such circulation system.

Abstract: A x-ray tube comprising an anode sealed to a flexible coupling. The flexible coupling can allow the anode to deflect or tilt in various directions to allow an electron beam to impinge upon various selected regions of an anode target. A method of utilizing different regions of an x-ray tube target by tilting or deflecting an x-ray tube anode to cause an electron beam to impinge on a selected region of the target.

Abstract: An X-ray tube is provided. The X-ray tube includes a first housing including an X-ray window formed therein, a second housing being rotatable about a rotational shaft installed within the first housing, an anode installed on the rotational shaft within the second housing and positioned in one side of the rotational shaft in an extending direction of the rotational shaft, an emitter installed on the rotational shaft within the second housing, positioned in the other side of the rotational shaft in the extending direction of the rotational shaft, and emitting electron beams, a lens unit installed between the anode and the emitter and focusing the electron beams emitted from the emitter to the anode, and an electron beam deflection unit installed on the rotational shaft to deflect an angle of electron beams moving toward the anode from the lens unit.

Abstract: An x-ray tube includes a frame forming a first portion of a vacuum enclosure, a rotating subsystem shaft positioned within the vacuum enclosure and having a first end and a second end, wherein the first end of the rotating subsystem shaft is attached to a first portion of the frame, a target positioned within the vacuum enclosure and attached to the rotating subsystem shaft between the first end and the second end, the target positioned to receive electrons from an electron source positioned within the vacuum enclosure, and a thermal compensator mechanically coupled to the second end of the rotating subsystem shaft and to a second portion of the frame, the thermal compensator forming a second portion of the vacuum enclosure.

Abstract: The present invention relates to filtering of X-ray radiation generated at multiple focal spots. For the generation of multiple-energy X-ray radiation, an X-ray tube (10) for generating multiple-energy X-ray radiation is provided that comprises an anode (12) and a filter unit (14). The anode comprises at least a first (16) and a second focal spot position (18), which are offset from each other in an offset direction (20) transverse to an X-ray radiation projection direction.

Abstract: An electron beam emitter for generating an electron beam to be directed towards an anode of an X-ray tube for generating an X-ray beam, wherein the electron beam emitter comprises an electrically conductive tape, made of material capable of emission of electrons, configured to be supplied with electric energy for emitting the electron beam, and a support arrangement configured for mounting the tape under permanent tension.

Abstract: A high energy radiation generator utilizes sliding friction in a low pressure environment to generate high energy radiation, for example x-rays. The sliding friction may be generated by sweeping one material against a second material, for example rotating a surface of a rotor against a membrane, in the presence of an electron target, which may be one of the first material or the second material, or a different material.

Abstract: A rotary X-ray anode has a support body and a focal track formed on the support body. The support body and the focal track are produced as a composite by powder metallurgy. The support body is formed from molybdenum or a molybdenum-based alloy and the focal track is formed from tungsten or a tungsten-based alloy. Here, in the conclusively heat-treated rotary X-ray anode, at least one portion of the focal track is located in a non-recrystallized and/or in a partially recrystallized structure.

Abstract: An x-ray tube for generating a sweeping x-ray beam. A cathode is disposed within a vacuum enclosure and emits a beam of electrons attracted toward an anode. The anode is adapted for rotation with respect to the vacuum enclosure about an axis of rotation. At least one collimator opening corotates with the anode within the vacuum enclosure, such that a swept x-ray beam is emitted.

Abstract: This invention relates to high power X-ray sources, in particular to those equipped with a rotating X-ray anode capable of delivering a higher short time peak power than conventional rotating x-ray anodes. This invention can overcome the thermal limitation of peak power by allowing fast rotation of the anode and by introducing a lightweight material with high thermal conductivity in the region adjacent to the focal track material. The fast rotation can be provided by using sections of the rotating anode disk made of anisotropic high specific strength materials with high thermal stability that can be specifically adapted to the high stresses of anode operation. Uses include high speed image acquisition for X-ray imaging, for example, of moving objects in real-time such as in medical radiography.

Abstract: The present invention refers to hybrid anode disk structures for use in X-ray tubes of the rotary anode type and is concerned more particularly with a novel light weight anode disk structure (RA) which comprises an adhesion promoting protective silicon carbide (SiC) interlayer (SCI) deposited onto a rotary X-ray tube's anode target (AT), wherein the latter may e.g. be made of a carbon-carbon composite substrate (SUB?). Moreover, a manufacturing method for robustly attaching a coating layer (CL) consisting of a high-Z material (e.g. a layer made of a tungsten-rhenium alloy) on the surface of said anode target is provided, whereupon according to said method it may be foreseen to apply a refractory metal overcoating layer (RML), such as given e.g. by a tantalum (Ta), hafnium (Hf), vanadium (V) or rhenium (Re) layer, to the silicon carbide interlayer (SCI) prior to the deposition of the tungsten-rhenium alloy.

Abstract: An anode (30) is formed by building a carbon, such as a carbon reinforced carbon composite, or other ceramic substrate (50). A ductile, refractory metal is electroplated on the ceramic substrate to form a refractory metal carbide layer (52) and a ductile refractory metal layer (54), at least on a focal track portion (36). A high-Z refractory metal is vacuum plasma sprayed on the ductile refractory metal layer to forma vacuum plasma sprayed high-Z refractory metal layer (56), at least on the focal track portion.

Abstract: An x-ray tube includes a cathode adapted to emit electrons, a bearing assembly comprising a bearing hub, a target assembly positioned to receive the emitted electrons, the assembly having a target hub coupled to the bearing hub at an attachment face, wherein the attachment face comprises a first material compressed against a second material, and a first anti-wear coating attached to one of the first material and the second material and positioned between the first material and the second material.

Abstract: A component for introducing disturbances into the magnetic field of an asynchronous motor by altering a reluctance of the motor is disclosed. An asynchronous motor is provided that includes a stator having a plurality of windings that is configured to generate a rotating magnetic field when a current is provided to the plurality of windings. The asynchronous motor also includes a rotor positioned within the stator configured to rotate relative thereto responsive to the rotating magnetic field and a component separate from the stator and the rotor that is positioned within the rotating magnetic field, with the component being configured to alter a magnetic reluctance of the rotor so as create a disturbance in the rotating magnetic field.

Abstract: The present invention relates to determining changes in the X-ray emission yield of an X-ray tube, in particular determining dose degradation. In order to provide determination of such changes, an X-ray source is provided comprising a cathode, an anode; and at least one X-ray sensor (16). The cathode emits electrons towards the anode and the anode comprises a target area on which the electrons impinge, generating X-ray radiation. An X-ray barrier (24) is provided with an aperture (26) for forming an emitting X-ray beam from the X-ray radiation, wherein the emitting X-ray beam has a beam formation (30) with a central axis. The at least one X-ray sensor is arranged within the beam formation and measures the X-ray intensity for a specific direction of X-ray emission with an angle with respect to the central axis. The at least one X- ray sensor can be positioned inside the beam formation (30), but outside the “actual field of view” (40) as determined by a diaphragm (36).

Abstract: In one example, an x-ray target comprises a target track, a substrate, and an optional backing. The target track includes a base material and a grain growth inhibitor to reduce or prevent microstructure grain growth in the base material. The target track can be included as part of an x-ray tube anode, either of a rotary form or a stationary form.

Abstract: Anode targets for an x-ray tube and methods for controlling x-ray tubes for x-ray systems are provided. One x-ray system includes a field-generator configured to generate a field, an electron beam generator configured to generate an electron beam directed towards a target and a voltage controller configured to control the electron beam generator to produce an electron beam at a first energy level and an electron beam at a second energy level. The x-ray system also includes a field-generator controller configured to control a field to deflect at least one of the electron beams, wherein the electron beam, at the first energy level, impinges on the target at a first contact position and the electron beam, at the second energy level, impinges on the target at a second contact position. The at the first contact position and at the second contact position is configured to filter x-rays.

Abstract: An X-ray generator and an X-ray photographing apparatus including the X-ray generator generate characteristic X-rays. The X-ray generator includes an electron beam emission unit that emits electron beams; an electron beam guide unit, in which the electron beam emission unit is disposed, for condensing the electron beams and causing the electron beams to travel in a predetermined direction; and a target unit disposed to face the electron beam guide unit, and discharging X-rays when the electron beams collide with the target unit.

Abstract: An X-ray tube anode target assembly having a support shaft connected to a pivot assembly and a movable anode target surface disposed at one end of the support shaft. A first drive assembly is operably arranged with respect to the support shaft to provide oscillatory motion to the anode target about a first axis substantially parallel to the support shaft and drive cylinder operably arranged with respect to the contact element to provide a pivoting motion to the support shaft. A second drive assembly is operably arranged with respect to the drive cylinder to provide an oscillatory motion to the drive cylinder, the second drive cylinder having a cam portion to provide linear motion to the support shaft parallel to the first axis. The target surface is maintained at a substantially constant angle of impingement and maintains a substantially fixed distance from a cathode during target motion.

Abstract: A distributed X-ray source (3) and an imaging system (1) comprising such an X-ray source (3) are proposed. The X-ray source (3) comprises an electron beam source arrangement (19) and an anode arrangement (17). The electron beam source arrangement (19) is adapted to emit electron beams (24) towards at least two locally distinct focal spots (27) on the anode arrangement (17). Therein, the X-ray source is adapted for displacing the anode arrangement (17) with respect to the electron beam source arrangement (19). While the provision of a plurality of focal spots allows acquisition of projection images under different projection angles thereby allowing reconstruction of three-dimensional X-ray images e.g. in tomosynthesis application, a displacement motion of the anode arrangement (17) with respect to the electron beam source arrangement (19) may allow for distributed heat flux to the anode arrangement thereby possibly reducing cooling requirements.

Abstract: In an arrangement and method for active vibration compensation of an x-ray radiator, a counter-vibration generation unit is arranged within the x-ray radiator to reduce a vibration arising during operation of the x-ray radiator. The counter-vibration generating unit is engaged in an active connection with the x-ray radiator and generates a counter-vibration that is phase-shifted by 180 degrees relative to the operational vibration. Operational vibrations generated by the x-ray radiator can be directly reduced at the point of origin by the application of active counter-vibrations in the immediate proximity of the vibration generator. Additional vibration transmission to other system parts (for example a C-arm) is thereby reduced or prevented.

Abstract: X-ray apparatus comprises a linear accelerator adapted to produce a beam of electrons at one of at least two selectable energies and being controlled to change the selected energy on a periodic basis, and a target to which the beam is directed thereby to produce a beam of x-radiation, the target being non-homogenous and being driven to move periodically in synchrony with the change of the selected energy. In this way, the target can move so that a different part is exposed to the electron beam when different pulses arrive. This enables the appropriate target material to be employed depending on the selected energy. The easiest form of periodic movement for the target is likely to be a rotational movement.

Abstract: A control parameter is determined for a system for irradiating a predetermined target volume in a body with a particle beam. The system is constructed to direct the particle beam at a multiplicity of target points in the target volume in succession in order to produce at, each of the target points a predetermined dose distribution in a region around the target point. The control parameter controls the extent of an overlap of the dose distribution of a first target point with the dose distributions of neighboring target points. For determination of the control parameter, there is first determined a movement parameter which quantitatively characterizes the movement of the body at the first target point. The control parameter is determined in dependence on the movement parameter.

Abstract: An x-ray tube having a reduced spacing between the focal spot of an anode and an adjacent end wall of an evacuated enclosure is disclosed. This in turn positions the tube relatively closer to the chest wall of a patient during mammography procedures. In one embodiment, the x-ray tube comprises an evacuated enclosure having first and second ends interconnected by a cylindrical side wall. The evacuated enclosure includes a rotor assembly having a bearing assembly and a stem. An anode is rotatably supported by the stem of the rotor assembly and includes a target surface and an opposite second surface. The target surface is positioned to face the bearing assembly, while the second surface is positioned to face the first end of the evacuated enclosure, with no intervening structure interposed therebetween. A cathode is included to emit electrons for impingement on a focal spot of the focal track.

Abstract: A method of delivering radiation in a session includes delivering radiation towards a patient using a radiation system, wherein the radiation is delivered based at least in part on a physiological phase or a position of the patient, after the radiation is delivered, changing a configuration of the radiation system, wherein the act of changing the configuration is performed independent of at least one motion of the patient, and delivering additional radiation towards the patient after the configuration of the radiation system is changed, wherein the acts of delivering radiation and the act of changing the configuration are performed in response to a processor executing a treatment plan that prescribes a plurality of packages and a transition, the transition prescribing the act of changing the configuration of the radiation system when no radiation is being delivered by the radiation system.

Abstract: To provide an X-ray generator capable of preventing electric corrosion and exerting stable performance over long periods. The X-ray generator includes: a rotary anticathode having a rotary anticathode part and a shaft part; an anticathode accommodating case including an air-tight case part for keeping an area surrounding the rotary anticathode part in a vacuum atmosphere, and a journaling case part for rotatively supporting the shaft part via a bearing; and an electric motor to rotatably drive the anticathode (target). A water-cooled jacket, through which cooling water for cooling the rotary anticathode part and the shaft part flows, is provided in the rotary anticathode.

Abstract: Provided is an X-ray generator comprising a cathode for generating electrons; a rotating anode having a cylindrical electron impingement surface, an X-ray focal point being formed by a region in which the electrons impinge upon the electron impingement surface; and a Wehnelt electrode for imparting an electric field to the electrons emitted from the cathode. The Wehnelt electrode has a field formation surface for forming the electric field, and an electron passage aperture formed by the field formation surface. The field formation surface of the Wehnelt electrode is inclined with respect to a plane tangent to an outer circumferential surface of the rotating anode at the center of the X-ray focal point. The center of the cathode is in a plane orthogonal to the field formation surface and aligned with the center of the electron passage aperture.

Abstract: A rotary anode for a rotary anode X-ray tube has an anode disc with a supporting portion. A focal track is located in the vicinity of an outer diameter of the anode disc. The supporting portion has inhomogeneous material properties along a radial coordinate of the anode disc to provide a high mechanical load capacity in the area of an inner diameter of the anode disc and a high thermal load capacity at the focal track. These measures provide for a rotary anode for a rotary anode X-ray tube that meets the extreme thermal and mechanical loads during operation. Further, a method for manufacturing such a rotary anode is described as well.

Abstract: Anode targets for an x-ray tube and methods for controlling x-ray tubes for x-ray systems are provided. One x-ray system includes a field-generator configured to generate a field, an electron beam generator configured to generate an electron beam directed towards a target and a voltage controller configured to control the electron beam generator to produce an electron beam at a first energy level and an electron beam at a second energy level. The x-ray system also includes a field-generator controller configured to control a field to deflect at least one of the electron beams, wherein the electron beam, at the first energy level, impinges on the target at a first contact position and the electron beam, at the second energy level, impinges on the target at a second contact position. The at the first contact position and at the second contact position is configured to filter x-rays.

Abstract: An x-ray tube disclosed here in includes an emitter arranged to emit electrons on to a focal spot on a rotatable anode. The x-ray tube also includes a hollow tube arranged to receive electromagnetic radiation from the focal spot at one end of the hollow tube and transmit it to another end. The x-ray tube also includes two or more sensors arranged to detect the electromagnetic radiation through the hollow tube.

Abstract: A target for generating x-rays includes a target substrate comprising molybdenum and having a beveled surface according to a desired track angle, a track comprising tungsten and configured to generate x-rays from high-energy electrons impinging thereon, wherein the track comprises a brazing surface having an area that is less than an area of the beveled surface of the target substrate, and a braze joint attaching the brazing surface of the track to the beveled surface of the target substrate.

Abstract: An asymmetric x-ray tube. In one example embodiment, an x-ray tube includes an evacuated enclosure, a cathode assembly at least partially positioned within the evacuated enclosure and defining a first axis, and an anode assembly at least partially positioned within the evacuated enclosure and defining a second axis. The anode assembly includes a rotating anode having a focal spot. The focal spot and the second axis define a plane. The first axis is positioned beneath the plane.

Abstract: The invention relates to an X-ray tube with a rotatable anode, an X-ray imaging system and a method for adjusting the focal track of an X-ray tube with a rotatable anode. In order to improve the accuracy of X-ray tubes with rotating anodes and the run out characteristics of rotatable anodes, an X-ray tube with an envelope housing a cathode and an anode assembly is provided, wherein the anode assembly comprises a rotatable disk provided with an annular target forming a focal track, which focal track is rotationally symmetric around a symmetry axis, and a rotor stem for supporting the disk, which stem is rotatably supported around a primary axis of rotation. The stem is provided with a mounting surface to support the disk and the disk is provided with an abutment surface to be mounted to the mounting surface. According to the invention, correction means are arranged between the mounting surface and the abutment surface such that a run-out of the focal track in relation to the axis of rotation is adjustable.

Abstract: A method for generating an X-ray includes the steps of: disposing at least a target in a chamber; irradiating an electron beam onto the target from an electron beam source disposed in or outside the chamber so as to satisfy a relation of ??60 degrees if an incident angle of the electron beam is defined as “?”; and generating and taking an X-ray out of the target so as to satisfy a relation of ?30 degrees?????60 degrees if an output angle of the X-ray relative to a surface of the target is defined as “?”.

Abstract: Closed-loop circulation for providing liquid metal to an interaction region at which an electron beam is to impact upon the liquid metal to produce X-rays is presented. In a method according to the invention, the pressure of the liquid metal is raised to at least 10 bar using a high-pressure pump. The pressurized liquid metal is then conducted to a nozzle and ejected into a vacuum chamber in the form of a spatially continuous jet. After passage through the vacuum chamber, the liquid metal is collected in a collection reservoir, and the pressure of the liquid metal is raised to an inlet pressure, e.g. using a primer pump, suitable for the inlet of the high-pressure pump. The invention also relates to a corresponding circulation system and an X-ray source provided with such circulation system.

Abstract: An anode plate for an X-ray tube includes an outer edge, a center region, and a plurality of slots disposed along the outer edge and extending toward the center region (210b) with each of the plurality of slots including a slot end. The anode plate further includes slot termination material disposed around a least a portion of the periphery of one or more of the slot ends, the slot termination material operable to reduce the tension stress or compression stress at the slot end.

Abstract: The invention relates to X-ray analytical instruments (RX), more precisely a device for providing a high energy X-ray beam, typically above 4 keV, for X-ray analysis applications. The device comprises an X-ray tube with a turning anode and an X-ray lens for shaping the beam.

Abstract: An x-ray tube rotating anode. In one example embodiment, an x-ray tube rotating anode includes a hub configured to attach to a bearing assembly, rings positioned radially outward from the hub, bridges connecting the rings together, annular ring fins each attached to one of the rings, a focal track positioned radially outward from the annular ring fins, and annular focal track fins attached to the focal track.

Abstract: The disclosure relates to an amplifying optical cavity of the Fabry-Perot type that can be used in combination with a high-rate picosecond pumped laser for generating monochromatic X-rays. The disclosure relates to an amplifying optical cavity of the Fabry-Perot type that can be used for obtaining a strongly focused pumped laser beam having a high stability at the average power PMOY.

Abstract: An x-ray tube includes a housing enclosing a vacuum chamber, a cathode positioned within the vacuum chamber configured to emit electrons, and an anode positioned within the vacuum chamber to receive the electrons emitted from the cathode and generate a beam of x-rays from the electrons. The x-ray tube also includes a magnetic coupler drive configured to rotate the anode, with the magnetic coupler drive having an inner rotor frame positioned within the vacuum chamber and an outer rotor frame positioned outside the vacuum chamber and adjacent the inner rotor frame. The magnetic coupler drive also includes an inner rotor magnet mounted to the inner rotor frame and an outer rotor magnet mounted to the outer rotor frame. The inner and outer rotor magnets interact to generate a magnetic field that transfers torque from the outer rotor to the inner rotor, thereby causing the inner rotor to rotate the anode.

Abstract: The present invention refers to hybrid anode disk structures for use in X-ray tubes of the rotary anode type and is concerned more particularly with a novel light weight anode disk structure (RA) which comprises an adhesion promoting protective silicon carbide (SiC) interlayer (SCI) deposited onto a rotary X-ray tube's anode target (AT), wherein the latter may e.g. be made of a carbon-carbon composite substrate (SUB?). Moreover, a manufacturing method for robustly attaching a coating layer (CL) consisting of a high-Z material (e.g. a layer made of a tungsten-rhenium alloy) on the surface of said anode target is provided, whereupon according to said method it may be foreseen to apply a refractory metal overcoating layer (RML), such as given e.g. by a tantalum (Ta), hafnium (Hf), vanadium (V) or rhenium (Re) layer, to the silicon carbide interlayer (SCI) prior to the deposition of the tungsten-rhenium alloy.

Abstract: The present invention refers to X-ray tubes of the rotary-anode type for generating a fan beam of X-rays. More particularly, the invention is concerned with a system and method for compensating a class of system-related disturbances of the focal spot position FS on a target area AT of the rotating anode RA and particularly for compensating the anode wobble in an X-ray tube XT of the aforementioned type, which occurs as a periodically wobbling inclination angle of the anode disk's rotational plane with respect to an ideal rotational plane (z=0) which is oriented normal to the rotational axis z of the rotary shaft S on which the anode disk RA is inclinedly mounted due to an inaccuracy during its production process.

Abstract: A source of X-rays including at least two cathodes and at least one common anode configured and arranged so as to generate at least two spaced apart beams of X-rays emanating from respectively different locations of the anode, and separately controlled so as to be generated independently of one another. The staggered focal spots can be generated simultaneously or alternately as required. An X-ray imaging system comprising such an X-rays source, and a method utilizing such a source are also disclosed.

Abstract: In one example embodiment, an x-ray tube comprises an anode configured to rotate at an operating frequency, and a bearing assembly configured to rotatably support the anode and tuned to a resonant frequency that is different than the operating frequency.

Abstract: A tube for generating x-rays includes a cathode adapted to emit electrons, a target positioned to receive the electrons from the cathode on a surface thereof, an anode adapted with an aperture and positioned between the cathode and the target and configured to accelerate the electrons toward the target, and a rotating system adapted to rotate the target about an axis, the rotating system located in a position facing the surface of the target.

Abstract: The present invention is related to high power X-ray sources, in particular to those ones that are equipped with rotating X-ray anodes capable of delivering a much higher short time peak power than conventional rotating X-ray anodes according to the prior art. The herewith proposed design principle thereby aims at overcoming thermal limitation of peak power by allowing extremely fast rotation of the anode and by introducing a lightweight material with high thermal conductivity (2) in the region adjacent to the focal track material (4). The extremely fast rotation is enabled by providing sections of the rotary anode disk made of anisotropic high specific strength materials with high thermal stability (1, 3, 6) which will be specifically adapted to the high stresses building up when the anode is operated, as for example fiber-reinforced ceramic materials.

Abstract: According to one embodiment, there is provided an X-ray tube target. The X-ray tube target has a structure in which a carbon base material is bonded with an Mo base material or Mo alloy base material with a joint layer. The joint layer includes an MoNbTi diffusion phase, an NbTi alloy phase, an Nb-rich phase and a ZrNb alloy phase when the ratios of components in the joint layer are detected by EPMA.

Abstract: A system includes a beam filter positioning device including a plate configured to support one or more beam filters, and one or more axes operable to move the plate relative to a beam line. A control mechanism is coupled to the one or more axes for controlling the movement of the axes and configured to automatically adjust the position of at least one of the one or more beam filters relative to the beam line.

Abstract: To scan an object with differently shaped cone beams (112, 122), the present invention provides a CT scanner with a moveable X-ray tube (the meaning of “move the x-ray tube among a plurality of predefined positions” also covers the situation that the anode disk is moved among a plurality of corresponding positions, while the shell of the x-ray tube does not move). The X-ray tube is not only moveable along the axial direction, but also along the radial direction of the CT scanner gantry. The scanner comprises an X-ray tube, which X-ray tube further comprises: an anode disk (100), comprising a plurality of focal tracks (110, 120) each focal track being cone-shaped with an anode angle (114, 124) different from the anode angle(s) of the other focal track(s); and a first cathode (210), configured to emanate an electron beam targeting at least one of the plurality of focal tracks.