Technology is described for calibrating a deflected position of a central ray of an x-ray tube to a radiation imager. An x-ray system includes an x-ray tube and a tube control unit (TCU). The x-ray tube includes a cathode that includes an electron emitter configured to emit an electron beam, an anode configured to receive the electron beam and generate x-rays with a central ray from electrons of the electron beam colliding on a focal spot of the anode, and a steering magnetic multipole between the cathode and the anode that is configured to produce a steering magnetic field from a steering signal. At least two poles of the steering magnetic multipole are on opposite sides of the electron beam. The TCU includes at least one steering driver configured to generate the steering signal. The TCU is configured to convert a position correction value to the steering signal.

The embodiments relate to a CT system with a stationary part and a rotatable part, which is supported rotatably in the stationary part. At least one x-ray tube unit cooled by a cooling fluid, an x-ray detector lying opposite the x-ray tube unit, and a cooling device coupled in terms of fluid technology to the x-ray tube unit via a coolant circuit are disposed in the rotatable part. A cooling air channel, through which cooling air is able to be fed into the rotatable part, and an exhaust air channel, through which heated exhaust air is able to be taken away from the rotatable part, are disposed in the stationary part. In accordance with the embodiments, at least one overpressure relief valve is disposed in the coolant circuit, through which the cooling fluid is able to be conveyed away in the exhaust air channel.

The invention relates to a modification arrangement for an X-ray generating device, a modification method, a computer program element for controlling such device and a computer readable medium having stored such computer program element. The modification arrangement comprises a cathode, an anode (2) and modification means, e.g. a modification device. The cathode is configured to provide an electron beam (15). The anode (2) is configured to rotate under impact of the electron beam (15) and is segmented by slits (21) arranged around the anode's circumference. The modification means are configured to modify the electron beam (15) when the electron beam (15) is hitting one of the anode's rotating slits (21).

Technology is described for a magnetic lift device for an x-ray tube. In one example, an anode assembly includes an anode, a bearing assembly, a ferromagnetic shaft, and a lift electromagnet. The anode is configured to receive electrons emitted by a cathode. The bearing assembly is configured to stabilize the anode during a rotation of the anode. The ferromagnetic shaft is coupled to the anode and has an axis of rotation that is substantially collinear with an axis of rotation of the anode. The lift electromagnet is configured to apply a magnetic force to the ferromagnetic shaft in a radial direction.

The X-ray tube disclosed herein includes an electron emission unit including an electron emission element using a cold cathode; an anode unit disposed opposite to the electron emission unit, with which electrons emitted from the electron emission unit collide; and a focus structure disposed between the electron emission unit and a target unit disposed on a surface of the anode unit that is opposed to the electron emission unit. The electron emission unit is divided into first and second regions which can independently be turned ON/OFF. The X-ray tube is focus-designed such that collision regions, at the anode unit, of electron beams emitted from the respective first and second regions substantially coincide with each other.

The X-ray tube disclosed herein includes an electron emission unit including an electron emission element using a cold cathode; an anode unit disposed opposite to the electron emission unit, with which electrons emitted from the electron emission unit collide; and a focus structure disposed between the electron emission unit and a target unit disposed on a surface of the anode unit that is opposed to the electron emission unit. The electron emission unit is divided into first and second regions which can independently be turned ON/OFF. The X-ray tube is focus-designed such that collision regions, at the anode unit, of electron beams emitted from the respective first and second regions substantially coincide with each other.

An X-ray tube assembly for generating an X-ray, comprises: a filament including a plurality of electric flow paths; and an adjustor configured to adjust at least one of values of current flowing through the plurality of electric flow paths to adjust an electron emission area of the filament.

According to one embodiment, an X-ray tube includes a cathode, an anode target and an envelope. The cathode includes an insulating member, a conductive line, a pin assembly, a filament, a focusing electrode, and a terminal assembly. The conductive line is formed on the insulating member. The pin assembly includes a pin and a first sleeve. The terminal assembly is fixed to the insulating member, is supporting the filament, and is electrically connecting the filament to the conductive line.

According to one embodiment, an X-ray tube assembly includes a cathode, an anode target, a joint including an inflow part into which a coolant flows, a first cylindrical pipe to which the joint is connected at one end, and the anode target is joined at an outer bottom part of the other end, a second cylindrical pipe whose first end part is fitted into the inflow part, and whose second end part is arranged to eject the coolant toward the bottom part of the first cylindrical pipe, the second cylindrical pipe being placed inside the first cylindrical pipe and an elastic member provided between the first end part and the first cylindrical pipe.

Provided is an X-ray generating tube including an electron gun, which includes a grid electrode secured to a support member. In the X-ray generating tube, thermal stress generated at a joining portion between the support member and the grid electrode is reduced, to thereby maintain a position of an electron beam on a target irradiated with the electron beam accurately for a long time. A grid electrode and a support member are secured to each other via a buffer member, which has an elastic coefficient that is lower than elastic coefficients of the grid electrode and the support member, and which is joined to the grid electrode and the support member through a first joining portion on the grid electrode side and a second joining portion on the support member side, respectively.