Gradient coil unit and magnetic resonance apparatus

Abstract

The utility model relates to a gradient coil unit, comprising: a conductor structure comprising an electric conductor forming a hollow conductor having a hollow area, the electric conductor comprising at least one main area and a connection area, the connection area being electrically connected in series with the main area, the electrical conductor has a cross-section in the main region with a first outer shape and a first inner shape, the electrical conductor has a cross-section in the connection region with a second outer shape and a second inner shape, the second outer shape differing from the first outer shape and / or the second inner shape differing from the first inner shape; and a cooling device which is designed to guide a cooling medium through the hollow region, the cooling device having a feed line device which comprises a hose device and a connection device which is compatible with a second inner shape and / or a second outer shape of the hollow conductor in the connection region. The utility model also relates to magnetic resonance equipment.

Description

Technical Field

[0001] The utility model relates to a gradient coil unit, which includes a conductor configured as a hollow conductor with a hollow region and a cooling device configured to guide a cooling medium through the hollow region, and also relates to a magnetic resonance device including such a gradient coil unit. Background Art

[0002] In a magnetic resonance device, an object to be examined, especially the body of a patient, is typically subjected to a relatively high main magnetic field by means of a main magnet, for example, a main magnetic field of 1.5 or 3 Tesla. In the field of magnetic resonance imaging (MR imaging), gradient pulses are emitted by means of a gradient coil unit. Additionally, subsequently, radio frequency (hochfrequent) radio frequency pulses (HF pulses), especially 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 flip by a defined flip angle with respect to the magnetic field lines of the main magnetic field. During nuclear spin relaxation, radio frequency signals, so-called magnetic resonance signals, are emitted, and the radio frequency signals are received by means of a suitable radio frequency antenna and then further processed. Finally, the desired image data can be reconstructed from the raw data thus obtained.

[0003] Therefore, for a specific measurement, a specific magnetic resonance control sequence (MR control sequence), also called a pulse sequence, should be transmitted, which is composed of a series of radio frequency pulses, such as excitation pulses and refocusing pulses, and gradient pulses to be coordinated accordingly along different gradient axes in different spatial directions. A read window is set to match this in time, and the read window presets a time period during which the induced magnetic resonance signals are detected.

[0004] Traditionally, a gradient coil unit includes three primary coils and three cooperating secondary coils. The primary coils are typically designed to generate a magnetic field gradient in a spatial direction, especially within a patient accommodation area. The magnetic field gradient is typically a first-order and / or linear-order magnetic field, especially a magnetic field whose amplitude linearly increases along a spatial direction. The primary coils are typically arranged on the surface of a cylinder. The primary coils typically include four conductor structures. The four conductor structures are typically arranged symmetrically with respect to each other and / or are respectively arranged in one quadrant of the cylinder surface. Each of the four conductor structures is typically designed in a saddle shape. The conductor structures typically define the geometric arrangement of an electric conductor, especially an electric conductor arranged on the cylinder housing, and the electric conductor is preferably at least partially designed in a helical shape.

[0005] The magnetic field gradient is generated by controlling a primary coil with a current, the amplitude of which reaches several hundred A, and the current is subject to frequent and rapid changes in the current direction at a rate of increase and decrease of several hundred kA / s. The magnetic field gradient is thus a time-varying magnetic field.

[0006] Stronger magnetic field gradients and / or rates of increase and decrease typically enable faster recording of raw data and / or higher resolution of image data. In particular, when examining the head of an examination object, especially during diffusion-weighted recording and / or when using a magnetic resonance device with a main magnetic field of more than 3 Tesla, particularly strong magnetic field gradients of up to 500 mT / m with rates of increase and decrease of up to 1000 T / s / m, and in special cases up to 2000 T / s / m, are desired. Here, a power loss in the form of heat is generated, which must be dissipated particularly effectively to ensure the continuous operation of the gradient coil unit.

[0007] To cool the conductor structure particularly effectively, the conductor structure can include an electrical conductor configured as a hollow conductor, where the hollow conductor has a hollow region through which a cooling medium can be guided. For this purpose, a cooling device can be connected to the conductor structure, particularly the hollow conductor, and the cooling device can generate a flow of the cooling medium through the hollow region. Since, in particular to improve the efficiency of cooling, the length of the cooling circuit may be different from the length of the circuit given by the conductor structure, typically a plurality of connection points between the cooling device and at least one conductor structure are required. For this purpose, there is no standardized or normalized interface. Summary of the Utility Model

[0008] The object underlying the present utility model is to provide a gradient coil unit with a particularly robust and effective cooling device. This object is achieved by a gradient coil unit and a magnetic resonance device. Advantageous design options are described in the following description.

[0009] The gradient coil unit according to the present utility model includes an electrical conductor configured as a hollow conductor having a hollow region, the electrical conductor including at least one main region and a connection region. The connection region is electrically connected in series with the main region, and the electrical conductor has a cross-section with a first outer shape and a first inner shape in the main region. The electrical conductor has a cross-section with a second outer shape and a second inner shape in the connection region, where the second outer shape is different from the first outer shape, and / or the second inner shape is different from the first inner shape.

[0010] Additionally, the gradient coil unit includes a cooling device configured to guide a cooling medium through the hollow region. The cooling device has an input pipeline device, which includes a hose device and a connection device. The connection device is compatible with the second internal shape and / or the second external shape of the hollow conductor in the connection region.

[0011] The hollow conductor can be integrally formed. The hollow conductor includes a conductive material that has a hollow region inside, and the hollow region extends over the length of the hollow conductor. The conductive material is configured to conduct current corresponding to the conductor structure. The hollow region is configured to accommodate a cooling medium, in particular a fluid. A layer and / or coating including additional material can be provided between the hollow region and the electrical material.

[0012] The electrical conductor including a main region and a connection region can be subdivided and / or divided into a main region and a connection region. The connection region is preferably continuously connected to the main region such that the electrical current flow does not have a change and / or interruption when transitioning from the connection region to the main region. Preferably, the portion of the electrical conductor associated with the main region has an electrical series connection with the portion of the electrical conductor associated with the connection region.

[0013] The difference between the main region and the connection region preferably lies in that the electrical conductor has a different shape, in particular a different profile and / or a different cross-section, in the connection region than in the main region.

[0014] The first internal shape typically at least partially bounds the hollow region in the main region. The first external shape typically encloses the electrical conductor in the main region outwardly, especially on the side facing away from the hollow region. The second internal shape typically at least partially bounds the hollow region in the connection region. The second external shape typically encloses the electrical conductor in the connection region outwardly, especially on the side facing away from the hollow region.

[0015] The difference between the first internal shape and the second internal shape and / or the difference between the first external shape and the second external shape can be achieved by changing the first internal shape and / or the first external shape of the electrical conductor in the connection region. Here, the first internal shape and / or the first external shape can be modified to a defined second internal shape and / or second external shape. The change can include, for example, non-cutting production methods such as forming and / or pressing, or cutting production methods such as turning, grinding, threading, and / or milling.

[0016] The hose device and the connection device are preferably connected to each other such that it is feasible to successively guide the cooling medium through both, and in particular there is no outflow of the cooling medium at the transition between the hose device and the connection device, so that the transition between the hose device and the connection device is sealed.

[0017] The cooling device typically comprises means for guiding a cooling medium through an input line device, in particular through a hose device and a connection device. The cooling device typically comprises means for guiding the cooling medium from the input line device into a hollow region. The input line device, in particular the connection device, can typically be joined in an exactly matching manner, in particular can be connected in a sealed and / or leak-free manner, to the connection region of an electrical conductor. The connection device is compatible with the second inner shape and / or the second outer shape of the hollow conductor in the connection region, provided they can typically be joined in an exactly matching manner, in particular can be connected in a sealed and / or leak-free manner.

[0018] The cooling device can comprise a cooling medium. The cooling device can comprise a cooling unit for cooling the cooling medium. The cooling device can comprise a pump configured to guide the cooling medium through the input line device, in particular the connection device and the hose device, and through the hollow region.

[0019] The shape of the electrical conductor in the connection region that is changed compared to the main region enables the use of standardized connection elements, in particular standardized plug connector fittings, as the connection device. This enables a safe, reproducible, and cost-effective connection between the cooling device and the electrical conductor while requiring little space. A cooling device configured to feed the cooling medium into the hollow conductor is particularly effective and enables particularly uniform cooling of the gradient coil unit.

[0020] One embodiment of the gradient coil unit provides that the connection device is configured to connect the connection device, in particular the hose device, to the connection region. Thus, the connection device is configured to establish a preferably cooling-medium-tight connection between the hose device and the electrical conductor, in particular the hollow conductor, in the connection region. This type of connection typically does not require heating and / or welding of the connection region of the electrical conductor and / or the input line device, thereby preventing potential deformation and / or damage of the connection region of the electrical conductor and / or the input line device due to heat. In addition, this connection can be established safely, with little time consumption, and cost-effectively.

[0021] One embodiment of the gradient coil unit provides that the connection is configured as a force-fit connection. This type of connection between the connection device, in particular the hose device, and the electrical conductor can be installed particularly easily and is exactly matching and sealed.

[0022] One embodiment of the gradient coil unit provides that the connection is configured as a form-fit connection. This type of connection between the connection device, in particular the hose device, and the electrical conductor can be installed particularly easily and is exactly matching and sealed.

[0023] One embodiment of the gradient coil unit proposes that the connection is formed to be reversibly detachable. According to this embodiment, the connection device can be repeatedly connected to the connection area of the electrical conductor. The connection device can, for example, be joined as a plug connector to the connection area of the electrical conductor and / or be configured as a plug connection device. This enables rapid installation of the connection, especially also with commercially available plug connection devices.

[0024] One embodiment of the gradient coil unit proposes that the connection includes an adhesive connection. The adhesive connection typically includes an adhesive. The adhesive connection enables a permanent and / or particularly firm connection.

[0025] One embodiment of the gradient coil unit proposes that the connection device and / or the hose device and / or the input line device are formed without metal. Such a cooling device does not have solder and does not have electrochemical corrosion, especially when in contact with the cooling medium. Thus, the gradient coil unit is formed particularly robustly. In particular, this design enables electrical insulation of the cooling device from the conductor structure.

[0026] One embodiment of the gradient coil unit proposes that the conductor structure is configured such that the electrical conductors form a circuit and the cooling device includes two cooling circuits for cooling the circuit, where the two cooling circuits are connected in parallel or in series. The input line device and the hollow area can form a cooling circuit. The cooling circuit is preferably characterized in that the cooling circuit can be successively flowed through by the cooling medium. The two cooling circuits are preferably electrically insulated from each other. This enables particularly effective cooling of the electrical conductors and the gradient coil unit.

[0027] One embodiment of the gradient coil unit proposes that the connection device and / or the hose device and / or the input line device include plastic. Such a cooling device does not have solder and does not have electrochemical corrosion, especially when in contact with the cooling medium. In the case of selecting different metals for the connection device, the hose device and / or the electrical conductor, corrosion can occur particularly quickly, especially corrosion caused by the electroplating process, which can be avoided by this embodiment.

[0028] One embodiment of the gradient coil unit proposes that the connection device can be reversibly connected to the hose device. According to this embodiment, the input line device is designed such that the hose device can be connected to the connection device as needed. The connection device can preferably be reversibly connected to the connection area of the hose device and the electrical area. Depending on the shape and size of the hose connection, this enables the use of cost-effective standard fittings as the connection device. In particular, 90°, 45°, Y-shaped connectors or multiple connectors can thus also be used as the connection device, which covers a wide range of applications.

[0029] One embodiment of the gradient coil unit proposes that the first outer shape is formed rectangularly and the second outer shape is formed circularly. The circular second outer shape can be produced, for example, based on the first outer shape by turning with a special tool. The circular shape in the connection area enables the joining of a large number of commercially available connection devices. The rectangular first outer shape enables a compact, stable and robust configuration of the conductor structure, in particular in the form of a saddle-shaped and at the same time helical shape.

[0030] One embodiment of the gradient coil unit proposes that the first inner shape and the second inner shape are formed circularly. Thus, the hollow region of the electrical conductor has a circular cross-section in the connection area and in the main area, whereby the cooling medium can be guided particularly uniformly through the hollow region.

[0031] One embodiment of the gradient coil unit proposes that the electrical conductor comprises copper and / or aluminum. The electrical conductor in the form of a hollow conductor made of copper and / or aluminum can be shaped particularly well and meets the electrical requirements with respect to the current intensity and voltage of the gradient coil unit.

[0032] One embodiment of the gradient coil unit proposes that the electrical conductor has an inner surface facing towards the hollow region and at least partially surrounding the hollow region and an outer surface that at least partially encloses the electrical conductor towards the outside.

[0033] According to the said embodiment, the first outer shape includes the contour of the outer surface of the electrical conductor in the main area in cross-section, and the second outer shape includes the contour of the outer surface of the electrical conductor in the connection area in cross-section. According to the said embodiment, the first inner shape includes the contour of the inner surface of the electrical conductor in the main area in cross-section, and the second inner shape includes the contour of the inner surface of the electrical conductor in the connection area in cross-section.

[0034] Furthermore, the present utility model is based on a magnetic resonance device having a main magnet, a radio frequency antenna unit, a gradient coil unit according to the present utility model, and a gradient control unit connected to the gradient coil unit, the gradient control unit being configured to control the gradient coil unit.

[0035] When the gradient coil unit is controlled by the gradient control unit, the gradient coil unit is typically configured to generate a magnetic field gradient in at least one spatial direction. The embodiment of the magnetic resonance device according to the present utility model is configured similarly to the embodiment of the gradient coil unit according to the present utility model. The advantages of the magnetic resonance device according to the present utility model basically correspond to the advantages of the gradient coil unit according to the present utility model described in detail above. The features, advantages or alternative embodiments mentioned here can equally be transferred to other claimed subject matters, and vice versa. Description of the Drawings

[0036] Other advantages, features and details of the present utility model are derived from the embodiments described hereinafter and from the accompanying drawings.

[0037] The accompanying drawings show:

[0038] Figure 1 In a first view, an embodiment of a gradient coil unit according to the present utility model is schematically shown.

[0039] Figure 2 An embodiment of a gradient coil unit according to the present utility model is shown in the region of the connection part between the cooling device and the conductor structure.

[0040] Figure 3 In a second view, a cross-section shows an embodiment of an electrical conductor of the conductor structure of a gradient coil unit according to the present utility model in the main region.

[0041] Figure 4 In a second view, a cross-section shows an embodiment of an electrical conductor of the conductor structure of a gradient coil unit according to the present utility model in the connection region.

[0042] Figure 5 In a second view, a cross-section shows an embodiment of a connection device of an input pipeline device of a gradient coil unit according to the present utility model.

[0043] Figure 6 In a second view, a cross-section shows an embodiment of a hose device of an input pipeline device of a gradient coil unit according to the present utility model, and

[0044] Figure 7 A magnetic resonance device according to the present utility model is schematically shown in a schematic view. Detailed implementation

[0045] Figure 1 In a first view, an embodiment of a gradient coil unit 19 according to the present utility model is schematically shown. In Figure 1One quadrant of the gradient coil unit 19 is shown. Typically, the gradient coil unit 19 has four such quadrants. The gradient coil unit 19 includes a conductor structure 30, and the conductor structure 30 has an electrical conductor configured as a hollow conductor having a hollow region 31. The conductor structure 30 is arranged within one quadrant in the shown case. The gradient coil unit 19 can be controlled by means of a gradient control unit 28. The gradient control unit 28 is preferably configured separately from the gradient coil unit 19. In addition, the gradient coil unit 19 has a cooling device 40, and the cooling device is configured to guide a cooling medium through the hollow region 31 of the conductor structure 30. For this purpose, the cooling device 40 includes at least one input pipeline device 41, and in the shown case includes at least three input pipeline devices 41, and each of the input pipeline devices 41 has a connection part with the conductor structure 30. The region of the connection part E is shown in detail in Figure 2 in detail.

[0046] Figure 2 In the region of the connection part E between the cooling device 40 and the conductor structure 30, an embodiment of the gradient coil unit 19 according to the present invention is shown. The electrical conductor of the conductor structure 30 can be divided into a main region 32 and a connection region 35, wherein the connection region 35 is electrically connected in series with the main region 32. The electrical conductor has a cross-section with a first outer shape 33 and a first inner shape 34 in the main region 32. The electrical conductor has a cross-section with a second outer shape 36 and a second inner shape 37 in the connection region 35. The second outer shape 36 is different from the first outer shape 33 in the shown case. Additionally, the second inner shape 37 can be different from the first inner shape 34. The cooling device 40 includes a hose device 43 and a connection device 42, and the connection device 42 is compatible with the second inner shape 37 and the second outer shape 36 of the hollow conductor in the connection region 35. The A mark passes through the cross-section of the main region 32 of the conductor structure 30. The B mark passes through the cross-section of the connection region 35 of the conductor structure 30. The C mark passes through the cross-section of the connection device 42. The D mark passes through the cross-section of the hose device 43.

[0047] The connection device 42 is configured to connect the connection device 42 to the connection region 35. In particular, the hose device 43 is configured to be connected to the connection region 35.

[0048] Figure 3In a second view, a cross-section shows an embodiment of the electrical conductor of the conductor structure of the gradient coil unit 19 according to the present invention in the main region 32, in particular cross-section A. In the shown embodiment, the electrical conductor has a first outer shape 33 that is rectangular in shape, in particular square. The contour that encloses the electrical conductor in the main region 32 on the side facing away from the hollow region 31 is typically referred to as the first outer shape 33. In the shown embodiment, the electrical conductor has a first inner shape 34 that is circular in shape. Thus, the first inner shape 34 is circularly formed. The contour that encloses the electrical conductor in the main region 32 on the side facing the hollow region 31 is typically referred to as the first inner shape 34.

[0049] Figure 4 In a second view, a cross-section shows an embodiment of the electrical conductor of the conductor structure of the gradient coil unit 19 according to the present invention in the connection region 35, in particular cross-section B. In the shown embodiment, the electrical conductor has a second outer shape 36 that is circular in shape. Thus, the second outer shape 36 is circularly formed. The contour that encloses the electrical conductor in the connection region 35 on the side facing away from the hollow region 31 is typically referred to as the second outer shape 36. In the shown embodiment, the electrical conductor has a second inner shape 37 that is circular in shape. Thus, the second inner shape 37 is circularly formed. The contour that encloses the electrical conductor in the connection region 35 on the side facing the hollow region 31 is typically referred to as the second inner shape 37. Thus, the second outer shape 36 is different from the first outer shape 33. The radius of the second inner shape 37 can be different from the radius of the first inner shape 34. The radius of the second inner shape 37 can be greater than the radius of the first inner shape 34.

[0050] The radius of the second inner shape 37 can be less than the radius of the first inner shape 34. The second inner shape 37 can correspond to the first inner shape 34.

[0051] Figure 5 In a second view, a cross-section shows an embodiment of the connecting device 42 of the input pipeline device 41 of the gradient coil unit 19 according to the present invention, in particular cross-section C. The connecting device 42 preferably has a shape such that the connecting device can be precisely and fittingly joined to the second inner shape 37 and / or the second outer shape 36 of the electrical conductor. For this purpose, the connecting device can have an inner diameter corresponding to the second inner shape 37. In particular, the connection between the connecting device 42 and the connection region 35 of the electrical conductor can be configured as a force-fit connection and / or a form-fit connection, where the connection is reversibly detachable. The connection can also include an adhesive connection. The connecting device 42 is preferably made of non-metal and includes plastic.

[0052] Figure 6An embodiment of the hose device 43 of the input line device 41 of the gradient coil unit 19 according to the present invention is shown in cross-section in a second view, in particular section D. The hose device 43 preferably comprises a flexible plastic hose which is permanently connected to the connecting device 42 and / or can be reversibly arranged at the connecting device 42, in particular can be reversibly connected to the connecting device 42. The hose device 43 is preferably formed without metal and comprises plastic.

[0053] Figure 7 A magnetic resonance device 11 according to the present invention is shown in a schematic view. The magnetic resonance device 11 comprises a detector unit 13 having a main magnet 17 which is used to generate a strong and in particular constant main magnetic field 18 parallel to the longitudinal direction, in particular parallel to the cylinder axis. In addition, the magnetic resonance device 11 has a cylindrical patient accommodation area 14 for accommodating a patient 15, wherein the patient accommodation area 14 is cylindrically surrounded by the detector unit 13 in the circumferential direction. The patient 15 can be pushed into the patient accommodation area 14 by means of the patient support device 16 of the magnetic resonance device 11. The patient support device 16 has an examination table for this purpose, which is movably arranged within the magnetic resonance device 11. The detector unit 13 further has: a radio frequency antenna unit 20 which, in the case shown, is configured as a body coil fixedly integrated into the magnetic resonance device 11; and a radio frequency antenna control unit 29 for exciting polarization, which polarization occurs in the main magnetic field 18 generated by the main magnet 17. The radio frequency antenna unit 20 is controlled by the radio frequency antenna control unit 29 and emits radio frequency pulses into the examination space which is essentially formed by the patient accommodation area 14.

[0054] In addition, the detector unit 13 has a gradient coil unit 19 according to the present invention, 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 control unit 28 can comprise at least one gradient amplifier unit not shown in detail and is configured to generate a voltage and / or a current in the gradient coil unit 19, in particular a gradient pulse according to an MR control sequence, for example preset by the gradient control unit 28. For a detailed illustration of the gradient coil unit 19, reference is made in particular to Figures 1 to 6 .

[0055] To control the main magnet 17, the gradient control unit 28, and the radio frequency antenna control unit 29, the magnetic resonance device 11 has a control unit 24. The control unit 24 centrally controls the magnetic resonance device 11, for example, the execution of MR control sequences. The magnetic resonance device 11 has a display unit 25. 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 the user during the measurement process. The control unit 24 can include the gradient control unit 28 and / or the radio frequency antenna control unit 29 and / or the display unit 25 and / or the input unit 26.

[0056] The illustrated magnetic resonance device 11 can of course include other components that a magnetic resonance device 11 typically has. In addition, the general operating mode of the magnetic resonance device 11 is known to those skilled in the art, such that a detailed description of other components is omitted.

[0057] Although the details of the present utility model have been described in detail by way of preferred embodiments, the present utility model is not limited by the disclosed examples, and other variants can be derived by those skilled in the art without departing from the protection scope of the present utility model.

Claims

1. A gradient coil unit, the gradient coil unit comprising: A conductor structure, the conductor structure including an electrical conductor configured as a hollow conductor having a hollow region, Characterized in that, The electrical conductor includes at least one main region and a connection region, wherein The connection region is electrically connected in series with the main region, The electrical conductor has a cross-section with a first outer shape and a first inner shape in the main region, The electrical conductor has a cross-section with a second outer shape and a second inner shape in the connection region, Wherein the second outer shape is different from the first outer shape, and / or the second inner shape is different from the first inner shape, And the gradient coil unit further includes a cooling device, wherein the cooling device is configured to guide a cooling medium through the hollow region, and the cooling device has an input pipeline device, the input pipeline device including a hose device and a connection device, and the connection device is compatible with the second inner shape and / or the second outer shape of the hollow conductor in the connection region.

2. The gradient coil unit according to claim 1, Wherein the connection device is configured to connect the connection device to the connection region.

3. The gradient coil unit according to claim 2, Wherein the connection device is configured to connect the hose device to the connection region.

4. The gradient coil unit according to claim 2, Wherein the connection is configured as a force fit connection.

5. The gradient coil unit according to claim 2, Wherein the connection is configured as a form fit connection.

6. The gradient coil unit according to any one of claims 2 to 5, Wherein the connection is configured to be reversibly detachable.

7. The gradient coil unit according to any one of claims 2 to 5, Wherein the connection includes an adhesive connection.

8. The gradient coil unit according to any one of claims 1 to 5, Wherein the connection device and / or the hose device and / or the input pipeline device are configured without metal.

9. The gradient coil unit according to any one of claims 1 to 5, Wherein the connection device and / or the hose device and / or the input pipeline device include plastic.

10. The gradient coil unit according to any one of claims 1 to 5, Wherein the connection device can be reversibly connected to the hose device.

11. The gradient coil unit according to any one of claims 1 to 5, Wherein the first outer shape is configured rectangularly, and the second outer shape is configured circularly.

12. The gradient coil unit according to any one of claims 1 to 5, Wherein the first inner shape and the second inner shape are configured circularly.

13. The gradient coil unit according to any one of claims 1 to 5, Wherein the electrical conductor includes copper and / or aluminum.

14. The gradient coil unit according to any one of claims 1 to 5, Wherein the electrical conductor has an inner surface facing the hollow region and at least partially surrounding the hollow region and an outer surface at least partially enclosing the electrical conductor outwardly, The first outer shape includes the contour of the outer surface of the electrical conductor in the main region in cross-section. The second outer shape includes the contour of the outer surface of the electrical conductor in the connection region in cross-section. The first inner shape includes the contour of the inner surface of the electrical conductor in the main region in cross-section. The second inner shape includes the contour of the inner surface of the electrical conductor in the connection region in cross-section.

15. The gradient coil unit according to any one of claims 1 to 5, wherein the conductor structure is configured such that the electrical conductor forms a circuit, and the cooling device includes two cooling circuits for cooling the circuit, wherein the two cooling circuits are connected in parallel or in series, and the input pipeline device and the hollow region can form a cooling circuit.

16. The gradient coil unit according to claim 15, wherein the cooling circuit is characterized in that the cooling circuit can be successively flowed through by a cooling medium.

17. The gradient coil unit according to claim 15, wherein the two cooling circuits are electrically insulated from each other, which enables particularly effective cooling of the electrical conductor and the gradient coil unit.

18. A magnetic resonance apparatus, the magnetic resonance apparatus including a main magnet and a radio frequency antenna unit, characterized in that the magnetic resonance apparatus further includes the gradient coil unit according to any one of claims 1 to 17 and a gradient control unit connected to the gradient coil unit, the gradient control unit being configured to control the gradient coil unit.

Images