Gradient termination unit designed to connect gradient control unit to gradient coil unit, and magnetic resonance apparatus

Abstract

The utility model relates to a gradient terminating unit, which is used for connecting a gradient control unit with a gradient coil unit, and comprises three connecting cable units, three terminating cable units; a fixing plate; a rotating plate, which, when the rotating plate is locked in the first position, selects a first arrangement of three connecting cable units and connects one connecting cable unit to one connecting cable unit, extends from the rotating plate in a first terminating direction, when the rotating plate is locked in the second position, the three terminating cable units extend from the rotating plate in a second terminating direction when a second arrangement of the three connecting cable units is selected and one connecting cable unit is connected with one terminating cable unit, and the three terminating cable units extend from the rotating plate in the first terminating direction and the second terminating direction in the first position and the second position. The termination cable unit and the connection cable unit do not overlap outside the connection element in a projection view parallel to the post axis.

Description

Technical Field

[0001] The utility model relates to a gradient terminal unit used for connecting a gradient control unit with a gradient coil unit and a magnetic resonance device. Background Art

[0002] In a magnetic resonance apparatus, the body part of an object to be examined, in particular a patient to be examined, is usually subjected to a relatively high main magnetic field, for example a main magnetic field of 1.5 or 3 Tesla, in a patient accommodation area by means of a main magnet. In addition, gradient pulses are emitted by means of a gradient coil unit. Subsequently, high-frequency (hochfrequent) radio frequency pulses (HF pulses), in particular excitation pulses, are transmitted via a radio frequency antenna unit by means of a suitable antenna device, which causes the nuclear spins of specific atoms resonantly excited by the HF pulses to tilt by a defined flip angle relative to the magnetic field lines of the main magnetic field. During the relaxation of the nuclear spins, radio frequency signals, so-called magnetic resonance signals, are radiated, which are received by means of a suitable radio frequency antenna and subsequently further processed. Finally, the desired image data can be reconstructed from the raw data thus obtained. The gradient coil unit, the radio frequency antenna unit and the main magnet can be referred to as a detector unit.

[0003] The gradient coil unit typically includes three gradient coils. The gradient coil is typically designed to generate a magnetic field gradient in a spatial direction. The gradient coil is controlled by means of an electric current whose amplitude reaches hundreds of A and the electric current is subjected to frequent and rapid changes in the current direction with a rate of rise and rate of fall of hundreds of kA / s. For this purpose, the gradient coil unit is connected to a gradient control unit. The gradient control unit typically includes three voltage sources and / or three gradient amplifier units for this purpose, wherein each gradient coil is connected to each voltage source and / or gradient amplifier unit. For this purpose, the gradient coil unit is electrically connected to the gradient control unit via a gradient termination unit. The gradient control unit is typically arranged at a distance from the detector unit, in particular in order to minimize the electromagnetic interaction between the detector unit and the gradient control unit. The magnetic resonance device is typically arranged in a space shielded by HF, and the gradient control unit is arranged outside the space shielded by HF. The spacing between the gradient control unit and the detector unit is typically greater than two meters. The gradient termination unit is conventionally designed so as to overcome the spacing and not limit the freedom of movement around the detector unit. For this purpose, the cable conventionally included by the gradient termination unit is typically guided upwards, especially toward the ceiling of the room, or downwards, ie toward the floor of the room, by the detector unit. Here, the cable is conventionally arched, bent and fixed accordingly. Utility Model Content

[0004] The object of the present invention is to provide a particularly robust and flexibly usable gradient termination unit. The object is achieved by the features of the embodiments. Advantageous designs are described in the following embodiments.

[0005] The gradient termination unit according to the utility model is configured to connect the gradient control unit to the gradient coil unit when the gradient coil unit is comprised of a hollow cylindrical detector unit surrounding a patient accommodation area and when the gradient coil unit comprises three gradient coils. The gradient termination unit according to the utility model comprises:

[0006] three connecting cable units, each of different lengths and each designed for connection to a respective gradient coil,

[0007] - Three cable termination units,

[0008] - a fixing plate formed for mounting on a longitudinal side of the detector unit,

[0009] A rotating plate movably connected to the fixed plate.

[0010] The rotating plate includes three connecting elements, each of which is configured to electrically connect the connecting cable unit to the termination cable unit. The rotating plate can be locked in a first position and a second position. When the rotating plate is locked in the first position, when the first arrangement of the three connecting cable units is selected and each connecting cable unit is connected to each termination cable unit, the three termination cable units extend from the rotating plate in the first termination direction. When the rotating plate is locked in the second position, when the second arrangement of the three connecting cable units is selected and each connecting cable unit is connected to each termination cable unit, the three termination cable units extend from the rotating plate in the second termination direction. In the first position and the second position, the termination cable unit and the connecting cable unit do not overlap outside the connecting element in a projection view parallel to the column axis, especially parallel to the column axis of the hollow cylindrical detector unit.

[0011] The termination cable unit and the connecting cable unit are preferably non-crossing and / or non-contacting. In particular, the termination cable unit and the connecting cable unit are respectively arranged in areas that do not intersect each other and / or do not cross and / or overlap and / or intersect outside the connecting element. The column axis preferably corresponds to the column axis of the hollow cylindrical detector unit. Each of the three connecting cable units and / or each of the three termination cable units preferably includes two electrical conductors, a feed conductor and a return conductor. The current flow of the feed conductor and the return conductor belonging to a connecting cable unit and / or a termination cable unit is typically opposite. Each of the three connecting cable units and / or each of the three termination cable units is preferably straight, especially non-bending. The fixing plate can preferably be mechanically placed at the housing of the detector unit. The connection between the fixing plate and the detector unit is preferably permanent and / or independent of the position of the rotating plate. The change of direction between the three connecting cable units and the first termination direction and / or the second termination direction can be caused by means of the fixing plate and the rotating plate. In particular, according to the embodiment, the termination cable unit can be directed in at least two different directions in relation to the position of the rotating plate, which can ensure flexibility when installing the gradient termination unit, thereby ensuring flexibility when installing the gradient coil unit and / or the detector unit and / or a magnetic resonance device comprising the detector unit. The rotating plate is preferably configured elongated along the longitudinal axis. The three connecting elements preferably have positions that are different from each other along the longitudinal axis.

[0012] According to the gradient termination unit of the utility model, it is possible to realize that the gradient coil unit is connected to the gradient control unit by means of a cable without bending and without crossing. The gradient termination unit is typically arranged in the stray field of the main magnetic field, thereby subjecting to the Lorentz force. According to the gradient termination unit of the utility model, it is possible to realize the robust setting of the cable used, i.e. the connecting cable unit and / or the terminating cable unit, because in particular due to the use of a fixed plate and a rotating plate, the connecting cable unit and / or the terminating cable unit can be guided straight and / or without bending. Thus, less force works, the cable bears less load, and material fatigue is reduced. In particular, the connecting cable unit included by the gradient termination unit can be positioned according to at least two arrangements between the gradient coil unit and the connecting element, and the terminating cable unit can be guided away from the connecting element in at least two termination directions, so that at least two arrangements of the gradient coil unit can be realized based on the same element, thereby realizing the connection feasibility of the gradient coil unit. Therefore, the same module can be used for the first position of the rotating plate and the second position of the rotating plate. This can realize the particularly flexible use and large scope of use of the gradient termination unit. In particular, the gradient termination unit can be individually matched to the local conditions of the environment of the detector unit and / or the magnetic resonance device. Depending on the space in which the detector unit is to be installed, the gradient coil unit can be connected to the gradient control unit in a first termination direction or a second termination direction. Because the gradient control unit is typically arranged outside the shielded HF space surrounding the detector unit, the gradient termination unit according to the utility model can achieve particularly high flexibility when matching the spatial environment, and at the same time can achieve a robust arrangement without bent and / or crossed cables. In addition, because it is necessary to produce and plan a less individualized solution for connecting the gradient coil unit and the gradient control unit, this can achieve streamlined manufacturing.

[0013] An embodiment of the gradient termination unit provides that the rotating plate is rotatably supported on the fixed plate, and / or the first position and the second position can be set by rotating the rotating plate. The rotating plate is preferably rotatably supported around its center point, especially around the center point of the longitudinal axis. Such a gradient termination unit can be used particularly flexibly and robustly, especially because the first termination direction and the second termination direction can be selected individually.

[0014] One embodiment of the gradient termination unit provides that the three termination cable units are at least partially arranged parallel to each other, in particular along the first termination direction or along the second termination direction. The first termination direction and the second termination direction are preferably 180 ° apart. The parallel arrangement of the three termination cable units avoids the bending of the three termination cable units and / or enables the termination cable units to not contact and / or cross each other, which in particular reduces electromagnetic interaction. This gradient termination unit is particularly robust. The three termination cable units can be bent and / or stretched non-parallel at a spacing of at least one meter, preferably at least two meters from the detector unit, which can be advantageous in particular when passing through a filter plate and / or in the region of an intermediate cover and / or in a ventilation shaft, and can be advantageous in particular in the case of a smaller stray magnetic field at such a large spacing.

[0015] One embodiment of the gradient termination unit provides that the rotating plate comprises a covering device which is arranged above the three connection elements on the side facing away from the fixed plate. The covering device shields the three connection elements from electromagnetic influences and / or forms a mechanical protection for the three connection elements. This enables a particularly safe use of the gradient termination unit.

[0016] One embodiment of the gradient termination unit provides that the three connection cable units are arranged parallel to each other along the connection direction. The parallel arrangement of the three connection cable units avoids bending of the three connection cable units and / or enables the connection cable units to not touch and / or cross each other, which in particular reduces electromagnetic interactions. Such a gradient termination unit is particularly robust.

[0017] One embodiment of the gradient termination unit provides that a first connection cable unit of the three connection cable units has a first length, a second connection cable unit of the three connection cable units has a second length, and a third connection cable unit of the three connection cable units has a third length,

[0018] The second length is greater than the first length, and the third length is greater than the second length,

[0019] And the following three positions in the connection direction, at which each of the three connection cable units can be connected to each of the three gradient coils, differ by less than 30% of the difference between the second length and the first length.

[0020] The difference between the third length and the second length preferably corresponds to the difference between the second length and the first length.

[0021] According to the embodiment, the sides of the three connection cable units to be connected to the three gradient coils have the following positions in the connection direction: the positions differ by less than 30%, preferably 20%, particularly preferably 10% of the difference between the second length and the first length. The embodiment ensures that the three connection cable units can be used in the first arrangement and the second arrangement. The sides of the three connection cable units to be connected to the three gradient coils particularly preferably have the same position in the connection direction and / or are in a plane perpendicular to the connection direction when viewed in space.

[0022] One embodiment of the gradient termination unit provides that the first arrangement provides for a sequence of the three connection cable units, wherein the three connection cable units increase in length perpendicular to the connection direction. This enables the use of an elongated rotating plate, which enables a connection in a first termination direction in a first position and a connection in a second termination direction in a second position without having to change and / or reposition the connection elements.

[0023] One embodiment of the gradient termination unit provides that the second arrangement provides for the three connecting cable units to be arranged perpendicular to the connection direction in an inverted order from the first arrangement. This enables the use of an elongated rotating plate which enables a connection in a first termination direction in a first position and a connection in a second termination direction in a second position without having to change and / or reposition the connecting elements.

[0024] An embodiment of the gradient termination unit provides that the magnitude of the angle between the first termination direction and the connection direction corresponds to the magnitude of the angle between the second termination direction and the connection direction. The embodiment provides for a symmetrical arrangement of the connection direction, the first termination direction and the second termination direction. Thus, the three connection cable units with three different lengths can be connected to the three termination cable units via the connecting element in a first position or a second position of the rotating plate in relation to their arrangement, in a straight line and without bending. This enables a particularly flexible use of the gradient termination unit.

[0025] One embodiment of the gradient terminal unit provides that the connection direction is formed perpendicularly to the first terminal direction and / or the second terminal direction. This embodiment enables the gradient coil unit to be connected to the gradient control unit at an angle of 90° and the cables for the connection can run particularly straight.

[0026] One embodiment of the gradient termination unit provides that the connection direction is parallel to the horizontal line or forms an acute angle with the horizontal line, and the first termination direction is parallel to the vertical line or forms an acute angle with the vertical line. Preferably, the connection direction is parallel to the horizontal line, the first termination direction is parallel to the vertical line, and the second termination direction is parallel to the vertical line, wherein the first termination direction is oriented 180° rotated relative to the second termination direction.

[0027] The horizontal line preferably corresponds to a parallel line relative to the plane of the floor of the room in which the gradient termination unit and / or the detector unit and / or the magnetic resonance device is arranged. Additionally, the horizontal line is preferably perpendicular to the column axis. The vertical line preferably corresponds to a vertical line relative to the plane of the floor of the room in which the gradient termination unit and / or the detector unit and / or the magnetic resonance device is arranged. Additionally, the vertical line is preferably perpendicular to the column axis.

[0028] The embodiment described enables the cables for connecting the gradient coil unit, in particular the termination cable unit, to be guided away from the detector unit upwards towards the ceiling of the room or downwards towards the floor of the room in the region of the detector unit and enables the cables to be guided away from the detector unit upwards towards the ceiling of the room or downwards towards the floor of the room in the region of the detector unit. The floor and / or the ceiling typically comprise ventilation shafts, so that the termination cable unit and / or other cables can be guided hidden therefrom. The embodiment described minimizes the cables in the surroundings of the detector unit and in particular enables a flexible connection of the gradient coil unit. With the help of the gradient termination unit, a connection via the ceiling of the room or the floor of the room can be achieved. This enables high flexibility and individual adaptation on site to the spatial conditions of the detector unit during installation.

[0029] One embodiment of the gradient termination unit provides that a first connection cable unit of the three connection cable units has a first length, a second connection cable unit of the three connection cable units has a second length, and a third connection cable unit of the three connection cable units has a third length,

[0030] The second length is greater than the first length, and the third length is greater than the second length,

[0031] A first arrangement of the three connection cable units provides that the third connection cable unit is arranged below the second connection cable unit, and the second connection cable unit is arranged below the first connection cable unit.

[0032] And the first termination direction points vertically upward.

[0033] The connection direction is preferably parallel to the horizontal line. According to the embodiment, the longest of the three connection cable units, i.e. the third connection cable unit, is arranged at the bottom when viewed vertically, i.e. at the smallest spacing from the floor. In accordance with an embodiment of the first arrangement of the three connection cable units, the connection cable units are arranged with decreasing lengths as the spacing from the floor becomes larger. This enables the connection of the gradient coil unit via wiring on the ceiling in the case of the first arrangement of the connection cable units and the first position of the rotating plate.

[0034] One embodiment of the gradient termination unit provides that a first connection cable unit of the three connection cable units has a first length, a second connection cable unit of the three connection cable units has a second length, and a third connection cable unit of the three connection cable units has a third length,

[0035] The second length is greater than the first length, and the third length is greater than the second length,

[0036] A second arrangement of the three connection cable units provides that the third connection cable unit is arranged above the second connection cable unit, and the second connection cable unit is arranged above the first connection cable unit,

[0037] And the second termination direction points vertically upward.

[0038] The connection direction is preferably parallel to the horizontal line. According to the embodiment, the shortest of the three connection cable units, i.e. the first connection cable unit, is arranged in the lower part when viewed vertically, i.e. at the smallest spacing from the floor. In accordance with an embodiment of the second arrangement of the three connection cable units, the connection cable units are arranged with increasing lengths as the spacing from the floor becomes larger. This enables the connection of the gradient coil unit via the wiring on the floor in the case of the second arrangement of the connection cable units and the second position of the rotating plate.

[0039] One embodiment of the gradient termination unit provides that each of the three connection elements comprises at least one symmetrical cable connection head. Each connection element preferably comprises two symmetrical cable connection heads. This enables an equivalent connection between each connection cable unit and the termination cable unit in the first position and the second position of the rotating plate.

[0040] Furthermore, the present invention is based on a gradient system, which comprises: a gradient termination unit according to the present invention; a gradient control unit; and a gradient coil unit comprising three gradient coils, wherein the gradient termination unit connects the gradient control unit with the gradient coil unit.

[0041] In addition, the utility model is based on a magnetic resonance device, which includes: a detector unit; a gradient control unit; and a gradient termination unit according to the utility model. The detector unit includes: a main magnet; a gradient coil unit including three gradient coils; and a radio frequency antenna unit. The detector unit is preferably hollow cylindrical and surrounds the patient accommodation area. The gradient termination unit is configured to connect the gradient control unit to the gradient coil unit. The embodiments of the magnetic resonance device according to the utility model and the gradient system according to the utility model are configured similarly to the embodiments of the gradient termination unit according to the utility model. The advantages of the magnetic resonance device according to the utility model and the gradient system according to the utility model basically correspond to the advantages of the gradient termination unit according to the utility model described in detail above. The features, advantages or alternative embodiments mentioned here can also be transferred to other claimed subjects, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Further advantages, features and details of the invention result from the exemplary embodiments described below and with reference to the drawings.

[0043] The accompanying drawings show:

[0044] Figure 1 An embodiment of a magnetic resonance system according to the invention is shown schematically in a first view.

[0045] Figure 2 In the schematic diagram, an embodiment of the gradient termination unit according to the present invention is shown when the rotating plate is locked in the first position.

[0046] Figure 3 In the schematic diagram, an embodiment of the gradient termination unit according to the present invention is shown when the rotating plate is locked in the second position.

[0047] Figure 4 A schematic diagram in a second view shows an embodiment of a magnetic resonance system with a gradient termination unit according to the invention when the rotating plate is locked in a second position.

[0048] Figure 5 A schematic diagram of an embodiment of a symmetrical cable lug is shown in a first view, and

[0049] Figure 6 An embodiment of a symmetrical cable lug is shown schematically in a second view. DETAILED DESCRIPTION

[0050] Figure 1The schematic diagram shows a magnetic resonance system 11. The magnetic resonance system 11 comprises a detector unit 13, which comprises a main magnet 17 for generating a strong and in particular constant main magnetic field 18 parallel to the longitudinal direction z, in particular parallel to the column axis. In addition, the magnetic resonance system 11 has a cylindrical patient receiving area 14 for receiving a patient 15, wherein the patient receiving area 14 is cylindrically surrounded by the detector unit 13 in the circumferential direction. The patient 15 can be pushed into the patient receiving area 14 by means of a patient support device 16 of the magnetic resonance system 11. For this purpose, the patient support device 16 has an examination bed that is movably arranged in the magnetic resonance system 11. The detector unit 13 also has a radio frequency antenna unit 20, which in the case shown is designed as a body coil fixedly integrated into the magnetic resonance system 11; and a radio frequency antenna control unit 29 for exciting the polarization occurring in the main magnetic field 18 generated by the main magnet 17. The radio frequency antenna unit 20 is controlled by a radio frequency antenna control unit 29 and radiates high-frequency radio frequency pulses into an examination room which is substantially formed by the patient accommodation area 14 .

[0051] Furthermore, the detector unit 13 has a gradient coil unit 19, which is used for position encoding during imaging. The gradient coil unit 19 is controlled by means of a gradient control unit 28. The gradient coil unit 19 includes three gradient coils, which are not shown in detail. Furthermore, the magnetic resonance device 11 includes a gradient terminal unit 40 according to the utility model, which is designed to connect the gradient control unit 28 to the gradient coil unit 19. Depending on the position of the gradient control unit 28 relative to the gradient coil unit 19, the gradient coil unit 19 is not connected to the gradient control unit 28. Figure 1 The rotating plate 31 comprised by the gradient termination unit 40, shown in detail in FIG. 4 , can be locked in the first position or in the second position.

[0052] The magnetic resonance device 11 has a control unit 24 for controlling the main magnet 17, the gradient control unit 28 and the radio frequency antenna control unit 29. The control unit 24 centrally controls the magnetic resonance device 11, for example, controls the execution of MR control sequences. The magnetic resonance device 11 has a display unit 25. Control information, for example control parameters and reconstructed image data can be displayed to a user on the display unit 25, for example, at least one monitor. In addition, the magnetic resonance device 11 has an input unit 26, by means of which information and / or control parameters can be input by a user during the measurement process. The control unit 24 can include a gradient control unit 28 and / or a radio frequency antenna control unit 29 and / or a display unit 25 and / or an input unit 26.

[0053] The magnetic resonance system 11 shown may of course include further components which are usually present in a magnetic resonance system 11. Otherwise, the general mode of operation of the magnetic resonance system 11 is known to a person skilled in the art, so that a detailed description of the further components is omitted.

[0054] Figure 2 The schematic diagram shows an embodiment of the gradient termination unit 40 according to the present invention when the rotating plate 31 is locked in the first position. The gradient termination unit 40 is configured to connect the gradient control unit 28 to the gradient coil unit 19, as long as the gradient coil unit 19 is comprised by the hollow cylindrical detector unit 13 surrounding the patient accommodation area 14 and the gradient coil unit 19 comprises three gradient coils 21a, 21b, 21c. The detector unit 13, the gradient coil unit 19, the three gradient coils 21a, 21b, 21c and the gradient control unit 28 are typically not comprised by the gradient termination unit 40. The detector unit 13, the gradient coil unit 19 and the gradient control unit 28 are typically comprised by the magnetic resonance device 11.

[0055] The gradient termination unit 40 comprises three connecting cable units 22a, 22b, 22c, which have different lengths and are respectively configured to be connected to each gradient coil 21a, 21b, 21c. The three connecting cable units 22a, 22b, 22c are preferably arranged parallel to each other along the connection direction 37. The gradient termination unit 40 comprises three terminating cable units 23a, 23b, 23c. The three terminating cable units 23a, 23b, 23c are configured to be connected to the gradient control unit 28. The gradient control unit 28 typically comprises three gradient amplifier units 32a, 32b, 32c, wherein the three terminating cable units 23a, 23b, 23c are configured so that each of the three terminating cable units 23a, 23b, 23c can be connected to each of the three gradient amplifier units 32a, 32b, 32c. The three terminating cable units 23 a , 23 b , 23 c preferably extend parallel to one another.

[0056] The gradient termination unit 40 comprises a fixing plate 30 which is designed for mounting on a longitudinal side of the detector unit 13. The longitudinal side of the detector unit 13 typically corresponds to the end of the detector unit 13 in the longitudinal direction z, in particular perpendicular to the longitudinal direction z.

[0057] The gradient termination unit 40 includes a rotating plate 31, which is movably connected to the fixed plate 30. In particular, the rotating plate 31 is rotatably supported on the fixed plate 30.

[0058] The rotating plate 31 includes three connecting elements 33a, 33b, 33c, wherein each connecting element 33a, 33b, 33c is configured to electrically connect each connecting cable unit 22a, 22b, 22c to the terminating cable unit 23a, 23b, 23c. The rotating plate 31 may include a covering device, not shown in detail, which is arranged above the connecting elements 33a, 33b, 33c on the side facing away from the fixed plate 30.

[0059] Each connecting cable unit 22a, 22b, 22c is typically electrically connected to each terminating cable unit 23a, 23b, 23c via each connecting element 33a, 33b, 33c. Each connecting cable unit 22a, 22b, 22c is preferably electrically connected to each of the three gradient coils 21a, 21b, 21c.

[0060] Each terminating cable unit 23 a , 23 b , 23 c can preferably be electrically connected to each of the three gradient amplifier units 32 a , 32 b , 32 c .

[0061] The rotating plate 31 can be locked in the first position and the second position. Figure 2 The embodiment shown in shows that the rotating plate 31 is locked in the first position. For this purpose, the three connecting cable units 22a, 22b, 22c are arranged according to the first arrangement, and when connecting each of the connecting cable units 22a, 22b, 22c with each of the terminating cable units 23a, 23b, 23c, the three terminating cable units 23a, 23b, 23c point from the rotating plate 31 to the first terminating direction 35. According to the embodiment, the connecting direction 37 and the first terminating direction 35 are formed perpendicularly to each other. According to the embodiment, the connecting direction 37 is parallel to the horizontal line, and according to the embodiment, the first terminating direction 35 is parallel to the vertical line.

[0062] The terminating cable units 23a, 23b, 23c and the connecting cable units 22a, 22b, 22c do not overlap or intersect outside the connecting elements 33a, 33b, 33c in a projection view parallel to the column axis z. Therefore, the terminating cable units 23a, 23b, 23c and the connecting cable units 22a, 22b, 22c do not cross each other, but extend outside the connecting element in a geometrically non-intersecting manner.

[0063] The first connection cable unit 22a of the three connection cable units 22a , 22b , 22c has a first length, which corresponds to the spatial extension of the first connection cable unit 22a in the connection direction 37 .

[0064] The second connection cable unit 22 b of the three connection cable units 22 a , 22 b , 22 c has a second length, which corresponds to the spatial extension of the second connection cable unit 22 b in the connection direction 37 .

[0065] The third connection cable unit 22c of the three connection cable units 22a, 22b, 22c has a third length, which corresponds to the spatial extension of the third connection cable unit 22c in the connection direction 37. The second length is greater than the first length, and the third length is greater than the second length, in particular, the third connection cable unit 22c is longer than the second connection cable unit 22b and longer than the first connection cable unit 22a. The second connection cable unit 22b is shorter than the third connection cable unit 22c and longer than the first connection cable unit 22a.

[0066] In the embodiment shown, the following three positions in the connection direction 37 are identical, so that they differ by less than 30% of the difference between the second length and the first length: at the three positions, each of the three connection cable units 22a, 22b, 22c can be connected to each of the three gradient coils 21a, 21b, 21c. According to the first arrangement, the connection cable units 22a, 22b, 22c are arranged one above the other perpendicularly to the connection direction 37 and respectively parallel to the connection direction 37, wherein the order in which the connection cable units 22a, 22b, 22c are arranged one above the other perpendicularly to the connection direction 37 corresponds to the length sequence of the connection cable units 22a, 22b, 22c. According to the first arrangement, the third connection cable unit 22c is arranged below the second connection cable unit 22b. According to the first arrangement, the second connection cable unit 22b is arranged below the first connection cable unit 22a.

[0067] Figure 3 The schematic diagram shows an embodiment of the gradient termination unit 40 according to the present invention when the rotating plate 31 is locked in the second position. Figure 3 The embodiment shown in FIG. 4 preferably corresponds to the embodiment of the gradient termination unit 40 in FIG. Figure 2 , in which only the rotating plate 31 is not locked in the first position, but in the second position, and the three terminating cable units 23a, 23b, 23c point from the rotating plate 31 to the second terminating direction 36. In addition, the three connecting cable units 22a, 22b, 22c are arranged according to the second arrangement.

[0068] The second terminal direction 36 differs from the first terminal direction 35 by 180°. According to the embodiment, the connection direction 37 and the second terminal direction 36 are formed perpendicular to each other. In particular, the absolute value of the angle between the first terminal direction 35 and the connection direction 37 corresponds to 90° and thus to the absolute value of the angle between the second terminal direction 36 and the connection direction 37. According to the embodiment, the second terminal direction 36 points vertically downward.

[0069] Compared to the first arrangement, the second arrangement provides for an inverted sequence of the three connecting cable units 22a, 22b, 22c perpendicular to the connecting direction 37. In particular, the second arrangement of the three connecting cable units 22a, 22b, 22c provides that the third connecting cable unit 22c, i.e. the longest of the three connecting cable units 22a, 22b, 22c, is arranged above the second connecting cable unit 22b.

[0070] According to the first arrangement, the second connection cable unit 22b is disposed above the first connection cable unit 22a.

[0071] Figure 4 In a schematic diagram, a second view shows an embodiment of a magnetic resonance system 11 according to the invention with a gradient termination unit 40 when the rotating plate 31 is locked in the second position. The second view of the magnetic resonance system 11 is perpendicular to the first view and corresponds to a top view of the longitudinal side of the magnetic resonance system 11. The termination of the gradient coil unit 19 is therefore carried out in a direction toward the side of the magnetic resonance system 11 and then in a direction toward the floor on which the magnetic resonance system 11 is arranged.

[0072] Figure 5 One embodiment of a symmetrical cable lug 38 is shown schematically in a first view. Each of the three connecting elements 33a, 33b, 33c can comprise at least one symmetrical cable lug 38. Figure 5 A possible shape of such a symmetrical cable lug 38 is shown in a first view. Figure 6 In the second view, the symmetrical cable lug 38 is schematically shown along the Figure 5 A cross section of the line marked with A.

[0073] Although the details of the present invention have been described and illustrated in detail through preferred embodiments, the present invention is not limited to the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the protection scope of the present invention. Regardless of the grammatical gender of a particular term, people with male, female or other gender identities are included.

Claims

1. A gradient termination unit, which is configured to connect a gradient control unit to a gradient coil unit, wherein the gradient coil unit is comprised of a hollow cylindrical detector unit surrounding a patient accommodation area, and the gradient coil unit comprises three gradient coils, wherein the gradient termination unit comprises: - three connecting cable units, each of which has a different length and is each designed for connection to a respective gradient coil, - Three cable termination units, - a fixing plate configured for mounting on a longitudinal side of the detector unit, - a rotating plate movably connected to the fixed plate, the rotating plate - comprises three connecting elements, wherein each connecting element is designed to electrically connect a connecting cable unit to a terminating cable unit, - can be locked in a first position and a second position, wherein when the swivel plate is locked in the first position, upon selecting the first arrangement of the three connection cable units and connecting each connection cable unit with each termination cable unit, the three termination cable units extend starting from the swivel plate in the first termination direction, - when the swivel plate is locked in the second position, the three terminating cable units are extended starting from the swivel plate in the second terminating direction when selecting the second arrangement of the three connection cable units and connecting each one of the connection cable units to each one of the terminating cable units, In the first position and in the second position, the terminating cable unit and the connecting cable unit do not overlap outside the connecting element in a projection view parallel to the column axis.

2. The gradient termination unit according to claim 1, The rotating plate is rotatably supported on the fixed plate.

3. A gradient termination unit according to any one of the preceding claims, The three cable termination units are respectively arranged at least partially parallel to each other along the first termination direction or along the second termination direction.

4. A gradient termination unit according to any one of the preceding claims, The rotating plate comprises a covering device which is arranged above the three connecting elements on a side facing away from the fixed plate.

5. A gradient termination unit according to any one of the preceding claims, The three connecting cable units are respectively arranged parallel to each other along the connecting direction.

6. The gradient termination unit according to claim 5, wherein a first connection cable unit of the three connection cable units has a first length, a second connection cable unit of the three connection cable units has a second length, and a third connection cable unit of the three connection cable units has a third length, The second length is greater than the first length, and the third length is greater than the second length, And the following three positions in the connection direction differ by less than 30% of the difference between the second length and the first length: at the three positions, each of the three connection cable units can be connected to each of the three gradient coils.

7. The gradient termination unit according to any one of claims 5 to 6, The first arrangement specifies an order of the three connection cable units, wherein the three connection cable units increase in length perpendicular to a connection direction.

8. The gradient termination unit according to any one of claims 5 to 7, The second arrangement specifies that the three connection cable units are arranged perpendicular to the connection direction in an order opposite to that of the first arrangement.

9. The gradient termination unit according to any one of claims 5 to 8, The magnitude of the angle between the first termination direction and the connection direction corresponds to the magnitude of the angle between the second termination direction and the connection direction.

10. The gradient termination unit according to any one of claims 5 to 9, The connecting direction is configured to be perpendicular to the first terminal direction and / or the second terminal direction.

11. The gradient termination unit according to any one of claims 5 to 10, The connecting direction is parallel to a horizontal line or forms an acute angle with the horizontal line, and the first terminating direction is parallel to a vertical line or forms an acute angle with the vertical line.

12. A gradient termination unit according to any one of the preceding claims, wherein a first connection cable unit of the three connection cable units has a first length, a second connection cable unit of the three connection cable units has a second length, and a third connection cable unit of the three connection cable units has a third length, The second length is greater than the first length, and the third length is greater than the second length, A first arrangement of the three connection cable units provides that the third connection cable unit is arranged below the second connection cable unit, and the second connection cable unit is arranged below the first connection cable unit, And the first termination direction points vertically upward.

13. A gradient termination unit according to any one of the preceding claims, wherein a first connection cable unit of the three connection cable units has a first length, a second connection cable unit of the three connection cable units has a second length, and a third connection cable unit of the three connection cable units has a third length, The second length is greater than the first length, and the third length is greater than the second length, The second arrangement of the three connection cable units provides that the third connection cable unit is arranged above the second connection cable unit, and the second connection cable unit is arranged above the first connection cable unit, And the second termination direction points vertically downward.

14. A gradient termination unit according to any one of the preceding claims, Each of the three connecting elements comprises at least one symmetrical cable lug.

15. A magnetic resonance device, comprising a detector unit, the detector unit having: a main magnet; a gradient coil unit, the gradient coil unit comprising three gradient coils; and a radio frequency antenna unit; the magnetic resonance device comprising a gradient control unit and a gradient termination unit according to any one of the above claims, the gradient termination unit being configured to connect the gradient control unit to the gradient coil unit.

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