Rotary piston x-ray emitter with asymmetric deflection unit

Abstract

The invention relates to a rotary-piston x-ray emitter, comprising a housing, a rotary-piston x-ray tube, which is rotatably mounted in the housing about an axis of rotation relative to the housing, and a magnetic deflection unit, wherein the magnetic deflection unit comprises at least one multipole and is arranged outside the rotary piston, the at least one multipole has at least four magnetic poles, the at least four magnetic poles are arranged around the axis of rotation and each comprise a coil winding, and the magnetic poles further define a multipole plane, the central axis of at least one multipole is centrally perpendicular to the multipole plane, characterized in that the at least one multipole is configured such that the central axis of the at least one multipole and the axis of rotation form a plane.

Description

Technical Field

[0001] The invention relates to a rotary piston type X-ray radiator. Background Art

[0002] The main difference between a rotary piston X-ray radiator and a rotary anode X-ray radiator is that in a rotary piston X-ray radiator, the anode in the rotary piston X-ray tube rotates together with the evacuated rotary piston of the rotary piston X-ray tube. In contrast, in a rotary anode X-ray radiator, the anode in the evacuated X-ray tube rotates, while the evacuated X-ray tube is fixed in position.

[0003] Furthermore, there are further differences, namely in particular the arrangement of the electron emitters relative to the anode. In rotating anode and rotary piston X-ray tubes, the focal track is typically arranged in an off-center region of the anode.

[0004] Therefore, in rotary piston X-ray radiators, the electron emitter is typically arranged on the axis of rotation and thus centrally above the anode. The central arrangement of the electron emitter in a rotary piston X-ray radiator also results in that the electrons must be deflected relatively strongly toward the focal track on the anode by means of a deflection unit.

[0005] In a rotating anode X-ray radiator, the electron emitter is arranged eccentrically, preferably directly above the focal track on the anode, so that in a rotating anode X-ray radiator, the electrons must be deflected with significantly less intensity toward the focal track than in a rotary piston X-ray radiator. Depending on the embodiment of the rotating anode X-ray radiator, a deflection unit may optionally be provided for this purpose.

[0006] It is known that in conventional rotary piston X-ray radiators, despite a largely uniform electron distribution, a more inhomogeneous electron distribution results on the focal track when electrons are emitted at the electron emitter. The more inhomogeneous electron distribution is caused in particular by a relatively strong deflection by means of a deflection unit. For example, the deflection unit of a conventional rotary piston X-ray radiator can include two quadrupoles, which, by their deflection, cause a partial crossing of the electron tracks and thus a more inhomogeneous electron distribution. Finally, a more inhomogeneous electron distribution is disadvantageous due to the resulting increase in the thermal load of the focal track. Summary of the invention

[0007] The invention is based on the object of providing a rotary piston X-ray radiator with a more uniform electron distribution at the anode.

[0008] This object is achieved by the features of the rotary piston X-ray emitter according to the invention. Advantageous embodiments are described in the invention.

[0009] Regardless of the grammatical gender of a particular term, it also includes people with masculine or feminine gender.

[0010] The rotary piston X-ray radiator according to the present invention has:

[0011] -case,

[0012] - a rotary piston X-ray tube, and

[0013] - magnetic deflection unit,

[0014] The rotary piston X-ray tube is supported in the housing so as to be rotatable relative to the housing about a rotation axis.

[0015] The rotary piston X-ray tube has a cathode, a vacuumed rotary piston and an anode.

[0016] The anode is connected to the rotary piston in a rotationally fixed manner.

[0017] wherein the cathode has an electron emitter for emitting electrons and is arranged on the rotation axis in the rotary piston,

[0018] wherein the magnetic deflection unit comprises at least one multipole and is arranged outside the rotary piston, wherein the at least one multipole has at least four magnetic poles, which are arranged around the axis of rotation and each comprise a coil winding,

[0019] wherein the magnetic poles further define a multipole plane, a central axis of at least one multipole being centered perpendicular to said multipole plane,

[0020] It is characterized in that

[0021] The at least one multipole is arranged such that a central axis of the at least one multipole and the axis of rotation form a plane.

[0022] The advantage of the rotary piston X-ray radiator according to the invention is that the density of the electron distribution can be increased. The higher power of the rotary piston X-ray radiator can be achieved in particular by the fact that the electron distribution of the rotary piston X-ray radiator according to the invention is more uniform. Because a more uniform electron distribution advantageously has smaller power peaks caused by inhomogeneities. A more uniform electron distribution is achieved in particular by an asymmetric magnetic deflection unit of the rotary piston X-ray radiator according to the invention. The asymmetry of the magnetic deflection unit is achieved in particular by an offset of at least a part of the multipole, in particular the coil winding, relative to the axis of rotation and / or by an inclination of the multipole relative to the axis of rotation. Advantageously, due to the stronger deflection by means of the magnetic deflection unit, the rotary piston X-ray radiator according to the invention achieves a larger anode. A larger anode typically has a higher heat capacity and can therefore be better performing and / or have a longer life.

[0023] The rotary piston X-ray radiator is designed in particular for imaging. The imaging can in particular be medical imaging. Alternatively or additionally, imaging can be an application of the rotary piston X-ray radiator for security control, customs control and / or material inspection. In principle, it is conceivable that the rotary piston X-ray radiator is designed for therapeutic applications using X-rays.

[0024] In contrast to rotating anode X-ray radiators, rotary piston X-ray radiators have a rotatable rotary piston X-ray tube. In principle, it is conceivable that, in addition to the anode, the electron emitter is rotatably supported together with the evacuated rotary piston. In this case, the electron emitter is connected to the rotary piston in a rotationally fixed manner. Alternatively, the electron emitter can be connected to a stationary part of the housing and / or the bearing of the rotary piston X-ray tube in a rotationally fixed manner.

[0025] The housing of a rotary piston X-ray radiator typically includes a cooling medium and / or an insulating medium outside the rotary piston X-ray tube. The cooling medium can be designed as an insulating medium. The insulating medium in particular forms a high-voltage insulation for the rotary piston X-ray tube. The cooling medium and / or the insulating medium can in particular be liquid or gaseous. The housing of the rotary piston X-ray radiator is advantageously fluid-tight and can be closed and / or lockable.

[0026] The evacuated rotary piston of a rotary piston X-ray tube usually forms a vacuum housing, which typically contains a high vacuum. The electrons that can be generated by means of an electron emitter move in a high vacuum from the cathode to the anode, in particular along an electromagnetic field. The vacuum housing typically comprises metal and / or glass. The evacuated rotary piston is in particular cylindrical or conical or truncated cone or biconical. It is conceivable that the evacuated rotary piston consists of a plurality of housing sections, which have different conical or cylindrical shapes. The evacuated rotary piston is in particular designed to be rotationally symmetrical.

[0027] The electron emitter can be in particular a thermionic emitter or a field effect emitter. In principle, it is conceivable that the electron emitter comprises a plurality of emitter elements. The plurality of emitter elements can be thermionic emitters or field effect emitters. Alternatively, it is conceivable that the electron emitter has a combination of a thermionic emitter and a field effect emitter.

[0028] The electrons of the electron emitter are emitted, in particular, along the axis of rotation centrally above the anode on the axis of rotation. Therefore, the trajectory of the electrons typically starts centrally above the anode and / or on the axis of rotation.

[0029] The anode typically comprises tungsten, molybdenum and / or rhenium. The surface of the anode can have a conventional structure. The anode is in particular a disk-shaped anode. Due to the fact that the rotary piston rotates together with the anode during operation of the rotary piston X-ray radiator, a focal spot can be formed in an annular shape on the anode relative to the focal track, in which the electrons generate X-rays. In the region of the focal track, in particular incident electrons interact with the anode, wherein a large part of the kinetic energy of the electrons is converted into heat. Preferably, the focal track is arranged in the edge region of the anode so that the length of the focal track is increased due to its larger diameter, thereby improving the heat dissipation of the focal track. The larger the diameter of the focal track, and thus the longer the length of the focal track, the better the performance of the rotary piston X-ray radiator is preferably due to the increased heat dissipation, i.e. more electrons can appear on the anode.

[0030] The electromagnetic field used to accelerate electrons is typically an acceleration field, which can include an electric field component and / or a magnetic field component, and the electrons can be moved, especially deflected, by an electron emitter on the rotation axis toward a focal trajectory in an area off-center of the anode. The magnetic field component and the electric field component are especially superimposed and / or usually form an acceleration field. Due to the superposition and physical interaction with the electrons, the functions of acceleration, deflection and focusing of the electrons are extremely related to each other. Approximately, the electric field component can affect the electrons in the direction along the rotation axis, while the magnetic field component affects the electrons in a direction perpendicular to the rotation axis. The influence of the electrons means in particular that, by means of the field component, a force that can in particular cause acceleration and / or a change of direction can act on the electrons.

[0031] The electric field component can be generated, for example, by an acceleration unit. The acceleration unit can include a high-voltage source, which can preferably apply a voltage between 40 kV and 150 kV between the cathode and the anode. In a monopolar rotary piston X-ray radiator, the voltage difference can be distributed in particular to the ground potential at the anode and to a high-voltage potential of up to -150 kV at the cathode. Alternatively, in a bipolar rotary piston X-ray radiator, the high-voltage potential of the anode can be 75 kV and the high-voltage potential of the cathode can be -75 kV.

[0032] The magnetic field component of the acceleration field can be generated in particular by a magnetic deflection unit. The magnetic field component of the magnetic deflection unit can in particular change the direction of individual electrons. Ideally, the magnetic field component is set by means of the magnetic deflection unit so that an electron beam formed by the electrons can be deflected and / or focused. The deflection of the electron beam comprises in particular the steering of a large number of electrons from the axis of rotation toward the focal track. The focusing of the electron beam comprises in particular a change in the cross section of the electron beam, in particular a reduction and / or an increase.

[0033] The magnetic deflection unit is typically connected to the housing in a rotationally fixed manner. In this case, during operation of the rotary piston x-ray radiator, the rotary piston x-ray tube, in particular the anode, rotates relative to the magnetic deflection unit. The magnetic deflection unit is in particular designed to be stationary.

[0034] The evacuated rotary piston can in particular have a cylindrical housing section along the axis of rotation, wherein the cylindrical housing section has a diameter that is smaller than the anode diameter. Advantageously, the magnetic deflection unit surrounds the cylindrical housing section having the smaller diameter.

[0035] At least one multipole can have a surrounding yoke. The surrounding yoke can be in a plane, in particular a planar yoke. Alternative non-planar variants are described in the embodiments. The yoke and the poles typically have the same material and / or are formed in one piece. The poles can in principle correspond to yoke sections or be formed as protrusions relative to the surrounding yoke. In principle, all poles can be formed as protrusions relative to the surrounding yoke. The poles are characterized in particular by their coil windings, which surround the poles. The poles each comprising a coil winding means in particular that a coil winding is arranged around each pole.

[0036] Arranging four magnetic poles around the axis of rotation means in particular that the four magnetic poles surround the electrons. Advantageously, at least four poles are arranged in a multipole plane so that a surface bounded by at least four limits is traversed by the axis of rotation. Typically, the magnetic deflection unit, in particular the four magnetic poles, is arranged between the cathode and the anode. The four magnetic poles are preferably arranged regularly and / or symmetrically and / or equidistantly distributed.

[0037] Typically, each multipole has a multipole plane. The multipole plane is related to the positioning of the poles relative to each other. Depending on the embodiment of the magnetic pole, the center point of the pole and / or the end point of the pole and / or the center point of the corresponding winding package of the pole can define the position of the pole. The position of the pole can be related in particular to the corresponding coil winding and / or to the corresponding yoke or yoke section. The position of the pole can be related in particular to the material, curvature, diameter and / or length of the coil winding and / or the yoke or yoke section.

[0038] The four magnetic poles can typically be assigned a straight line in pairs, wherein the two straight lines are in a multipole plane. The two straight lines can be oriented in parallel or have a common intersection point. In this case, the four magnetic poles of at least one multipole, i.e. all poles, in particular geometrically define a multipole plane and / or are in the multipole plane.

[0039] In principle, an embodiment can be envisioned in which a portion of the magnetic poles is in a first plane and another portion of the magnetic poles is in a second plane, wherein the intersection of one portion and another portion can be non-zero. In a specific example, three magnetic poles can be in a first plane and two of the three magnetic poles and another magnetic pole can be in a second plane, wherein the first plane and the second plane do not overlap and / or form an angle. The multipole plane is particularly obtained in this case so that the first plane moves away from two of the three magnetic poles toward another magnetic pole. When the second plane moves away from two of the three magnetic poles toward the third of the three magnetic poles, the same result is usually obtained. In this case, only those poles of the final multipole that are not in the intersection of the portions geometrically define the multipole plane, wherein the poles of the intersection in particular can form a straight line parallel to the multipole plane.

[0040] Each multipole plane has in particular a central axis. The central axis of at least one multipole can be at the same distance from all poles of the multipole. It is possible that the poles are arranged so that the poles have the same distance from the central axis only in pairs. The central axis intersects the multipole plane, in particular at its center point which is usually predetermined by the poles. The center point in particular forms the geometric center of the multipole plane, wherein the central axis is located at the center point, i.e. centrally, on the multipole plane.

[0041] The central axis of the at least one multipole and the rotation axis form a surface, which means in particular that the magnetic poles of the at least one multipole are arranged correspondingly relative to the rotation axis. The at least one multipole is in particular arranged asymmetrically relative to the rotation axis, for example offset and / or tilted.

[0042] Forming a surface means in particular that the center axis of at least one multipole and the axis of rotation do not coincide and / or are not in the same straight line. In this case, the area is greater than zero. When the center axis of at least one multipole and the axis of rotation coincide or are in the same straight line, typically no surface is formed. In this case, the area is equal to zero.

[0043] The forming surface also typically assumes, from a geometrical point of view, that the central axis and the rotation axis intersect at an angle at a common intersection point or that the central axis and the rotation axis are oriented parallel to one another. The first case is described in the following embodiments and is essentially synonymous with the fact that the rotation axis is at another angle not equal to 90°, in particular not perpendicular to the multipole plane. The latter case, i.e. the parallel orientation, is described in further embodiments according to the following embodiments and is essentially synonymous with the fact that the rotation axis is arranged parallel to the central axis and offset.

[0044] A combination of the two cases, i.e. an angle not equal to zero and thus a non-parallel offset, is in principle conceivable. This combination is particularly true if the center point and the axis of rotation form a surface at which the center axis intersects the multipole plane. The offset in this case is a spacing between the center point and the axis of rotation that is not equal to zero.

[0045] In the following, embodiments are described in particular: They can be divided roughly into an asymmetrical arrangement with symmetrical multipoles or an arrangement with asymmetrical multipoles. Embodiments can be combined with one another in particular to a certain extent in any desired manner.

[0046] One embodiment provides that the center axis of at least one multipole and the axis of rotation have an angle not equal to zero relative to each other. The center axis intersects the axis of rotation in particular at a common intersection point. Advantageously, the common intersection point of the center axis and the axis of rotation is the center point of the multipole plane. Advantageously, the angle between the center axis and the axis of rotation is at least 1°, preferably greater than 5°. As for the further angle between the multipole plane and the axis of rotation, the further angle is therefore less than or equal to 89°, preferably less than or equal to 85°.

[0047] One embodiment provides that at least one multipole has a surrounding yoke, wherein the surrounding yoke has a bend toward the axis of rotation, so that a section of the yoke has a different angle relative to the axis of rotation than another section of the yoke. The surrounding yoke preferably completely surrounds the axis of rotation. The surrounding yoke is in particular a self-closing yoke, which can have straight and / or curved yoke sections. The bend toward the axis of rotation is shown in particular in a side view along the axis of rotation. This section of the yoke and another section of the yoke in particular define two different, non-overlapping planes, which have different angles relative to the axis of rotation.

[0048] One embodiment proposes that at least one multipole has a planar surrounding yoke, wherein at least one pole of at least one multipole has a different angle relative to the plane of the surrounding yoke compared to another pole of at least one multipole. In this case, the poles with different angles are particularly configured as protrusions relative to the surrounding yoke.

[0049] One embodiment provides that the center point of the multipole plane of at least one multipole has a distance from the axis of rotation that is not equal to zero. Preferably, the distance is at least 1 mm, preferably greater than 5 mm.

[0050] When the center axis of at least one multipole and the axis of rotation have an angle equal to zero relative to each other, so that the embodiment describes an offset as an alternative to the above embodiment with an angle not equal to zero, the embodiment is synonymous with the following: the center axis of the multipole plane of at least one multipole is oriented parallel to the axis of rotation. In this case, the center axis of the multipole plane of at least one multipole has a spacing from the axis of rotation that is not equal to zero.

[0051] If the central axis of the at least one multipole and the rotation axis have an angle not equal to zero relative to one another, thereby achieving a combination of angle not equal to zero and offset, this embodiment is synonymous with the central axis of the multipole plane of the at least one multipole being oriented non-parallel to the rotation axis.

[0052] All of the above embodiments can differ in particular in whether the central axis of the at least one multipole intersects the anode in the region between the rotation axis and the focal spot or whether the central axis of the at least one multipole intersects the anode outside the region between the rotation axis and the focal spot. In the first case, in a number of embodiments the at least one multipole is arranged closer to the focal spot than in the latter case. Depending on the design of the at least one multipole, two variants can be meaningful.

[0053] One embodiment provides that the magnetic deflection unit has a further multipole. Thus, in particular, the magnetic deflection unit has a further multipole in addition to the at least one multipole. This embodiment is particularly advantageous because, for example, the further multipole can be configured for deflecting electrons and the at least one multipole can be configured for focusing electrons. In principle, the further multipole has a multipole plane, which can be defined as described above corresponding to the multipole plane of the at least one multipole.

[0054] It is conceivable that the at least one multipole is identical in structure to the other multipole. The at least one multipole and the other multipole can in particular have the same number of poles and / or the same relative arrangement of the poles relative to one another. In this case, the at least one multipole can differ from the other multipole in particular only in its arrangement along the axis of rotation, but not in its orientation relative to the axis of rotation. As an alternative to a structurally identical embodiment, it is conceivable that only one of the multipoles has a bent, surrounding yoke and / or bent poles. It is particularly feasible that the other multipole has fewer poles, for example two poles or more poles, for example six poles, compared to the at least one multipole.

[0055] One embodiment provides that the at least one multipole and the other multipole differ in their orientation relative to the axis of rotation. The orientation relates in particular to the angle between the respective center axis and the axis of rotation and the spacing between the respective center point of the multipole plane and the axis of rotation. Thus, in the embodiment, the at least one multipole and the other multipole have different angles and / or spacings. The embodiment also explicitly includes variants in which the angle of the multipole and / or the spacing of the multipole is zero.

[0056] One embodiment provides that the center point of the multipole plane of the further multipole has a distance from the axis of rotation that is not equal to 0. In this context, the above statements for the corresponding embodiment of the at least one multipole also apply unchanged to the further multipole.

[0057] One embodiment provides that the further multipole is configured such that the central axis of the further multipole and the rotation axis have an angle relative to each other that is not equal to 0. In this context, the above statements for the corresponding embodiments of the at least one multipole also apply unchanged to the further multipole.

[0058] An alternative embodiment to the above two embodiments provides that the further multipole is configured such that the central axis of the further multipole and the rotation axis have an angle equal to zero and a spacing equal to zero relative to each other. In this case, the central axis of the further multipole is on the rotation axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In the following, the invention is described and explained in detail based on the exemplary embodiments shown in the drawings. In principle, in the following description of the figures, substantially unchanged structures and elements are designated by the same reference numerals as when the corresponding structure or element first appeared.

[0060] The accompanying drawings show:

[0061] Figure 1 shows a conventional rotary piston X-ray radiator,

[0062] Figure 2 A first embodiment of a rotary piston X-ray radiator according to the invention is shown.

[0063] Figure 3 A second embodiment of a rotary piston X-ray radiator according to the invention is shown.

[0064] Figure 4 A third embodiment of a rotary piston X-ray radiator according to the invention is shown.

[0065] Figure 5 A fourth embodiment of a rotary piston X-ray radiator according to the invention is shown.

[0066] Figure 6 shows the electron distribution of the rotary piston X-ray radiator according to the present invention,

[0067] Figure 7 A fifth embodiment of a rotary piston X-ray radiator according to the invention is shown.

[0068] Figure 8 A sixth embodiment of a rotary piston X-ray radiator according to the invention is shown.

[0069] Fig. 9 A seventh embodiment of a rotary piston X-ray radiator according to the invention is shown, and

[0070] Fig.10 An eighth exemplary embodiment of a rotary piston X-ray radiator according to the invention is shown. DETAILED DESCRIPTION

[0071] Figure 1 A conventional rotary piston X-ray radiator 10 is shown in a side view.

[0072] The conventional rotary piston X-ray radiator 10 has a housing (not shown), a rotary piston X-ray tube 11 and a magnetic deflection unit 12 .

[0073] The rotary piston X-ray tube 11 is supported in a housing so as to be rotatable relative to the housing about a rotation axis R. The rotary piston X-ray tube 11 has a cathode (not shown), an evacuated rotary piston 13, and an anode 14. The anode 14 is connected to the rotary piston 13 in a rotationally fixed manner. The cathode has an electron emitter for emitting electrons and is arranged on the rotation axis R in the rotary piston.

[0074] The trajectory of the centrally emitted electrons is shown by way of example using dotted lines and shows a relatively strong deflection toward the off-center region of the anode 14 in which the focal spot is located. Figure 1 In FIG. 1 , the electron distribution close to the electron emitter and thus closer to the beginning of the dashed line is shown next to a side view of a conventional rotary piston X-ray radiator 10 . Figure 1 The right side of the row shows the electron distribution close to the focal spot and thus closer to the end of the dashed line.

[0075] The magnetic deflection unit 12 comprises at least one multipole 15 and another multipole 16. The magnetic deflection unit 12 is arranged outside the rotary piston 13. The at least one multipole 15 and the other multipole 16 each have four magnetic poles on a surrounding yoke to form a quadrupole each. The magnetic poles are arranged around the rotation axis R, each including a coil winding and surrounding the emitted electrons.

[0076] The four poles of at least one multipole 15 define a multipole plane, and the central axis of at least one multipole 15 is centered perpendicular to the multipole plane. The four poles of another multipole 16 define another multipole plane, and the central axis of another multipole 16 is centered perpendicular to the another multipole plane.

[0077] The arrows indicate the central axis of at least one multipole 15 and of the further multipole 16 and coincide with the axis of rotation R. Thus, at least one multipole 15 is configured such that the central axis of at least one multipole 15 and the axis of rotation R do not form a plane. In other words, the central axis of at least one multipole 15 and the axis of rotation R have an angle equal to zero and a spacing equal to zero relative to one another. The same applies to the further multipole 16.

[0078] Figure 2 A first exemplary embodiment of a rotary piston X-ray radiator 20 according to the invention is shown in a side view.

[0079] The rotary piston X-ray radiator 20 has a housing (not shown), a rotary piston X-ray tube 21 and a magnetic deflection unit 22 .

[0080] The rotary piston X-ray tube 21 is supported in a housing so as to be rotatable relative to the housing about a rotation axis R. The rotary piston X-ray tube 21 has a cathode (not shown), an evacuated rotary piston 23, and an anode 24. The anode 24 is connected to the rotary piston 23 in a rotationally fixed manner. The cathode has an electron emitter for emitting electrons and is arranged on the rotation axis R in the rotary piston.

[0081] The magnetic deflection unit 22 comprises at least one multipole 25. The magnetic deflection unit 22 is arranged outside the rotary piston 23. The at least one multipole 25 has four magnetic poles on a surrounding yoke to form a quadrupole. The magnetic poles are arranged around the rotation axis R, each comprising a coil winding and surrounding the emitted electrons.

[0082] The four magnetic poles of at least one multipole 25 define a multipole plane, and the central axis of at least one multipole 25 is centered perpendicular to the multipole plane. The multipole plane is shown as a dot-dash line, and the central axis of at least one multipole 25 is centered perpendicular to the multipole plane. The arrow indicates the central axis of at least one multipole 25 and does not coincide with the rotation axis R. Therefore, at least one multipole 25 is configured so that the central axis of at least one multipole 25 and the rotation axis R form a plane. In the embodiment, the central axis of at least one multipole 25 and the rotation axis R have an angle relative to each other that is not equal to zero.

[0083] The angle is at least 1° in the embodiment, preferably greater than 5°. Furthermore, in the embodiment, the center axis of at least one multipole 25 intersects the anode 24 in the region between the rotation axis R and the focal spot. The focal spot is arranged in the lower half of the anode 24 in the embodiment. Alternatively, it is conceivable that the center axis of at least one multipole 25 intersects the anode 24 outside the region between the rotation axis R and the focal spot.

[0084] Figure 3 A second exemplary embodiment of a rotary piston X-ray radiator 20 according to the invention is shown in a side view.

[0085] The multipole plane is shown as a dot-dash line, and the central axis of at least one multipole 25 is centered perpendicular to the multipole plane. At least one multipole 25 is configured so that the central axis of at least one multipole 25 and the rotation axis R form a plane. The center point of the multipole plane of at least one multipole 25 has a spacing A that is not equal to zero from the rotation axis R. In the embodiment, the central axis of at least one multipole 25 and the rotation axis R are oriented parallel to each other and have a spacing A that is not equal to zero. The spacing A is preferably at least 1 mm, preferably greater than 5 mm. In addition, in the embodiment, the central axis of at least one multipole 25 intersects the anode 24 in the area between the rotation axis R and the focal spot.

[0086] Figure 4 A third exemplary embodiment of a rotary piston x-ray radiator 20 according to the invention is shown in a side view.

[0087] The multipole plane is shown as a dot-dash line, and the central axis of at least one multipole 25 is centered perpendicular to the multipole plane. The at least one multipole 25 is configured so that the central axis of the at least one multipole 25 and the rotation axis R form a plane. In the embodiment, the central axis of the at least one multipole 25 and the rotation axis R have an angle that is not equal to zero relative to each other. The surrounding yoke of the at least one multipole 25 has a bend toward the rotation axis R, so that one section of the yoke has a different angle relative to the rotation axis R than another section of the yoke. The rotation axis R divides the at least one multipole 25 into one section and another section. The angle between the two sections is Figure 4 In it, α and β are used to represent it.

[0088] Figure 5 A fourth exemplary embodiment of a rotary piston x-ray radiator 20 according to the invention is shown in a side view.

[0089] The multipole plane is shown as a dot-dash line, and the central axis of at least one multipole 25 is centered perpendicular to the multipole plane. At least one multipole 25 is configured so that the central axis of at least one multipole 25 and the rotation axis R form a plane. In the embodiment, the central axis of at least one multipole 25 and the rotation axis R have an angle that is not equal to zero relative to each other. At least one multipole 25 has a planar surrounding yoke. At least one pole of at least one multipole 25, in the embodiment two poles, has a different angle relative to the plane of the surrounding yoke than the other poles of at least one multipole 25.

[0090] Figure 6 The electron distribution of a rotary piston X-ray radiator 20 according to the present invention is shown.

[0091] The left side of a row shows the electron distribution close to the electron emitter and thus closer to the beginning of the electron trajectory. The right side of a row shows the electron distribution close to the focal spot and thus closer to the end of the electron trajectory. The latter electron distribution is similar to that in Figure 1 The electron distribution of the conventional rotary piston x-ray radiator 10 shown on the right in one row is more uniform in comparison.

[0092] Figure 7 A fifth exemplary embodiment of a rotary piston x-ray radiator 20 according to the invention is shown in a side view.

[0093] The fifth embodiment is Figure 2 This improvement is also clearly related to the first embodiment shown in Figure 3 The second embodiment shown in and / or in Figure 4 The third embodiment shown in and / or in Figure 5 The fourth embodiment shown in is compatible.

[0094] The magnetic deflection unit 22 further has another multipole 26. The at least one multipole 25 and the other multipole 26 differ in their orientation relative to the rotation axis R. The other multipole 26 is arranged so that the center point of the multipole plane of the other multipole 26 has a spacing equal to zero from the rotation axis R. The center axis of the other multipole 26 and the rotation axis R do not form a plane. The at least one multipole 25 and the other multipole 26 have the same number of magnetic poles.

[0095] Figure 8 A sixth exemplary embodiment of a rotary piston x-ray radiator 20 according to the invention is shown in a side view.

[0096] The sixth embodiment is Figure 2 This improvement is also clearly related to the first embodiment shown in Figure 3 The second embodiment shown in and / or in Figure 4 The third embodiment shown in and / or in Figure 5 The fourth embodiment shown in is compatible.

[0097] The magnetic deflection unit 22 further has another multipole 26. The at least one multipole 25 and the other multipole 26 differ in their orientation relative to the rotation axis R. The other multipole 26 is arranged so that the central axis of the other multipole 26 and the rotation axis R have an angle not equal to zero relative to each other. The central axis of the other multipole 26 and the rotation axis R form a plane. The central axis of the at least one multipole 25 and the central axis of the other multipole 26 together with the rotation axis R form an isosceles triangle.

[0098] Fig. 9 A seventh exemplary embodiment of a rotary piston x-ray radiator 20 according to the invention is shown in a side view.

[0099] The seventh embodiment is Figure 2 The improved scheme of the first embodiment shown in FIG. Figure 3 The second embodiment shown in and / or in Figure 4 The third embodiment shown in and / or in Figure 5 The fourth embodiment shown in is compatible.

[0100] The magnetic deflection unit 22 further has a further multipole 26. The at least one multipole 25 and the further multipole 26 differ in their orientation relative to the rotation axis R. The further multipole 26 is arranged such that the center point of the multipole plane of the further multipole 26 has a spacing A not equal to zero from the rotation axis R. The center axis of the further multipole 26 and the rotation axis R form a plane.

[0101] Fig.10 An eighth exemplary embodiment of a rotary piston x-ray radiator 20 according to the invention is shown in a side view with a cross section through a housing 27 of the rotary piston x-ray radiator 20 .

[0102] Although the details of the present invention are illustrated and described in more detail by preferred embodiments, the present invention is not limited to the disclosed examples and other variants can be derived therefrom by a person skilled in the art without departing from the scope of protection of the present invention.

Claims

1. A rotary piston X-ray radiator (20), comprising: - a housing (27), - a rotary piston X-ray tube (21), and - a magnetic deflection unit (22), The rotary piston X-ray tube (21) is supported in the housing (27) so as to be rotatable about a rotation axis (R) relative to the housing (27). The rotary piston type X-ray tube (21) comprises a cathode, an anode (24) and a vacuumed rotary piston (23). The anode (24) is connected to the rotary piston (23) in a rotationally fixed manner. wherein the cathode has an electron emitter for emitting electrons and is arranged on the rotation axis (R) in the rotary piston (23), The magnetic deflection unit (22) comprises at least one multipole (25) and is arranged outside the rotary piston (23). wherein the at least one multipole (25) has at least four magnetic poles, which are arranged around the rotation axis (R) and each include a coil winding, wherein the magnetic poles further define a multipole plane, the central axis of the at least one multipole (25) being centered perpendicular to the multipole plane, It is characterized in that The at least one multipole (25) is configured such that a central axis of the at least one multipole (25) and the rotation axis (R) form a plane.

2. The rotary piston X-ray radiator (20) according to claim 1, The central axis of the at least one multipole (25) and the rotation axis (R) have an angle not equal to zero relative to each other.

3. The rotary piston X-ray radiator (20) according to claim 2, The angle is at least 1°, preferably greater than 5°.

4. The rotary piston X-ray radiator (20) according to claim 2 , The at least one multipole (25) has a circumferential yoke, wherein the circumferential yoke has a bend toward the rotation axis (R) so that a section of the yoke has a different angle relative to the rotation axis (R) than another section of the yoke.

5. The rotary piston X-ray radiator (20) according to any one of claims 2 to 4, The at least one multipole (25) has a planar circumferential yoke, wherein at least one pole of the at least one multipole (25) has a different angle relative to the plane of the circumferential yoke than the other poles of the at least one multipole (25).

6. The rotary piston X-ray radiator (20) according to claim 1, The center point of the multipole plane of the at least one multipole (25) is at a distance (A) not equal to zero from the axis of rotation (R).

7. The rotary piston X-ray radiator (20) according to claim 6, The distance (A) is at least 1 mm, preferably greater than 5 mm.

8. The rotary piston X-ray radiator (20) according to claim 1, The central axis of the at least one multipole (25) intersects the anode (24) in a region between the rotation axis (R) and the focal spot.

9. The rotary piston X-ray radiator (20) according to any one of claims 1 to 7, The central axis of the at least one multipole (25) intersects the anode (24) outside the region between the rotation axis (R) and the focal spot.

10. The rotary piston X-ray radiator (20) according to claim 1, The magnetic deflection unit (22) has a further multipole (26).

11. The rotary piston X-ray radiator (20) according to claim 10, The at least one multipole (25) and the further multipole (26) differ in their orientation relative to the axis of rotation (R).

12. The rotary piston X-ray radiator (20) according to claim 10 or 11, The at least one multipole (25) and the other multipole (26) have the same number of magnetic poles.

13. The rotary piston X-ray radiator (20) according to any one of claims 10 to 12, The center point of the multipole plane of the further multipole (26) is at a distance (A) not equal to zero from the axis of rotation (R).

14. The rotary piston X-ray radiator (20) according to any one of claims 10 to 13, The further multipole (26) is configured such that a central axis of the further multipole (26) and the rotation axis (R) have an angle not equal to zero relative to each other.

15. The rotary piston X-ray radiator (20) according to any one of claims 10 to 12, The further multipole (26) is configured such that a center axis of the further multipole (26) and the rotation axis (R) have an angle equal to zero and a spacing equal to zero relative to each other.

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